Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Araz, Onur(12)
- Cakir, Tufan(7)
- Ozturk, Kasif Furkan(6)
- Kaya, Dilek(3)
- Livaoglu, R.(2)
- Alibabaei Shahraki, Mohammad(1)
- Altundaş, Suna(1)
- Cinar, T.(1)
- Dag, Serhat(1)
- Dogangun, A.(1)
- Elias, Said(1)
- Erdik, M.(1)
- Feyza Kablan(1)
- Goksu, C.(1)
- Ilki, A.(1)
- Kablan, Feyza(1)
- Kaşif Furkan Öztürk(1)
- Noroozinejad Farsangi, Ehsan(1)
- Ozyurt, Emre(1)
- Selahattin Kurt(1)
- Tanış, Abdulsamed(1)
- Çakir, Tufan(1)
Yayınlar
- Yüksek Lisans TeziYalnız künye2026Deprem tehlike analizleri ve kentsel dönüşüm planlaması: Kahramanmaraş - Göksun - Karaömerli örneği
Selahattin Kurt
Türkiye’nin aktif deprem kuşakları üzerinde yer alması, kentsel gelişim ve yatırım süreçlerinde deprem tehlikesinin dikkate alınmasını zorunlu kılmaktadır. Özellikle yapılaşma sürecinde gerçekleştirilecek yer seçim çalışmalarında, bölgenin jeolojik, jeofizik ve jeoteknik özelliklerinin yanı sıra depremsellik parametrelerinin ayrıntılı biçimde değerlendirilmesi gerekmektedir. Bu bağlamda, aktif deprem bölgelerinde planlanan yapıların depreme dayanıklı olarak tasarlanabilmesi için “Deprem Tehlike Analizleri” temel bir gereklilik olarak öne çıkmaktadır. Bu çalışmada, deprem konutlarının yapılması planlandığı proje sahasında, belirlenen noktalarda mikrotremör ölçümleri gerçekleştirilmiş; zemin hâkim periyot aralıkları ve spektral büyütme oranları belirlenmiştir. Elde edilen veriler doğrultusunda zemin-yapı periyot ilişkisi incelenmiş ve bölgenin deprem tehlike düzeyi ortaya konulmuştur. Ayrıca, bina doğal periyodu ile kat adedi ve bina yüksekliği arasındaki ilişkiler kullanılarak, zemin hâkim periyoduna bağlı rezonans bölgesi kat adedi aralıkları belirlenmiştir. Spektral büyütme oranları yardımıyla deprem tehlike düzeyleri ayrıntılı biçimde değerlendirilmiştir. Araştırma sonuçları, kentsel dönüşüm projelerinde planlanan yeni yerleşim alanlarının depremden en az düzeyde etkilenebilmesi için yer seçiminin mutlaka jeofizik yöntemlerle desteklenmesi gerektiğini göstermektedir. Yerbilimsel verilerden yoksun, yalnızca ekolojik ve teknolojik kriterlere dayalı akıllı şehir uygulamalarının, deprem gibi doğal afetlere karşı yeterli güvenliği sağlayamayacağı vurgulanmıştır. Sonuç olarak; zemin hâkim periyodunun bilinmesi durumunda, tasarlanacak yapıların kat adedi ve bina yüksekliği rezonans bölgesi eğrileri yardımıyla pratik olarak belirlenebilmektedir. Bu yaklaşım, deprem sırasında zemin-yapı etkileşiminin öngörülmesinde basitleştirilmiş ancak bilimsel açıdan geçerli bir yöntem sunmaktadır. Ayrıca, farklı tabaka kalınlıklarının zemin hâkim periyodu hesaplamalarına etkisi tartışılmış ve yönetmelik düzenlemeleri ile yüzey dalgası aktif derinliği dikkate alınarak zemin toplam derinliğinin 50 m olarak kullanılmasının uygun olduğu sonucuna ulaşılmıştır.
- MakaleYalnız künye2026Scopus SJRQ3Energy-based wind vibration control of turbines equipped with nonlinear tuned mass damper inerter considering soil-structure interaction
Alibabaei Shahraki, Mohammad; Araz, Onur
This study evaluates the effectiveness of a Nonlinear Tuned Mass Damper Inerter (NTMDI) in mitigating wind-induced vibrations in wind turbines, with explicit consideration of soil–structure interaction (SSI). Kinetic energy is selected as the primary response metric, supported by nacelle displacement, total structural energy, soil energy absorption, acceleration reduction, and residual soil energy to provide a comprehensive assessment. A detailed numerical model is developed in OpenSees, incorporating SSI effects and subjected to turbulent wind loads generated using the Shinozuka method. NTMDI parameters are optimized using the Multi-Objective Cuckoo Search Algorithm (MOCS) to balance kinetic-energy minimization, displacement suppression, and soil-energy management. The results show that NTMDI implementation achieves approximately 45% reduction in total kinetic energy, 20% reduction in nacelle displacement, and 25% reduction in tower acceleration relative to the uncontrolled system. When SSI is considered, the NTMDI further improves performance by reducing soil energy demand by an additional 15–20%, highlighting the importance of absorber–soil coupling. Compared with traditional TMDIs, the NTMDI exhibits superior adaptability and efficiency, particularly for flexible foundations. These findings confirm NTMDIs as an effective passive control strategy for enhancing wind-turbine stability.
AtıfScopus18WoS18OpenAlex8
İncele - BildiriYalnız künye2026Scopus SJRQ4Dynamic Analysis of a High-Rise Building Under Near-Fault and Far-Fault Loads Considering Soil-Structure Interaction
Kaya, Dilek; Cakir, Tufan; Ozturk, Kasif Furkan; Ilki, A.; Goksu, C.; Cinar, T.; Erdik, M.
Earthquakes that have occurred in our country and various countries around the world over the past 30 years have clearly indicated that the complex relationship between the soil, structure, and earthquake requires further research. This situation has shown that building behavior under dynamic loads can vary depending on parameters such as structural geometry, foundation soil system characteristics, and earthquake characteristics. Due to the fact that near-fault movements contain higher accelerations and higher velocity components compared to far-fault movements, high-rise structures may exhibit relatively more sensitive behavior under such loads and may be negatively affected by these earthquake contents. In this context, the aim of this study is to investigate the dynamic behavior of a 12-story building system under near-fault and far-fault ground motions, taking into account different soil properties. To this end, three-dimensional finite element models were first created for the 12-story building system, considering both fixed and flexible foundation conditions. Modal analyses were performed using finite element models created with ANSYS software, and the obtained mode periods were compared with those obtained from analytical models. Subsequently, the dynamic behavior of the 12-story building system was investigated using relative displacement, stress, and acceleration responses obtained from time-domain analyses conducted for different soil systems and fixed foundation conditions. Comparisons of the dynamic responses showed that the structural dynamic responses could be influenced not only by the soil-structure interaction system but also by nearby and distant fault earthquakes.
- MakaleYalnız künye2025Scopus SJRQ1Performance evaluation and optimization of nontraditional inerter-based tuned mass damper for seismic control of multi-story buildings considering SSI effects
Araz, Onur
This article presents the optimum design and performance evaluation of a control system that can be an alternative to traditional inerter-based tuned mass damper (TMDI) used in reducing vibrations in a multi-story building under earthquake effects considering soil-structure interaction (SSI). The optimum design of this system, known as NIDVA-C4 in the literature, has been carried out previously considering the randomly excited undamped main system. The key novelty of this work is to demonstrate the applicability of this system to suppress earthquake-induced vibrations in a multi-story building and to deliver more accurate and reliable results by integrating SSI effects into the optimization framework. Due to the difference in location and connection, this system is called N-TMDI in this paper. A case study from the literature featuring a ten-story building is used to implement the design process, assess performance, and conduct comparisons. The optimum parameters of the N-TMDI are obtained using the hybrid PSO-SA algorithm in the frequency domain. Validation using real earthquake records under varying soil conditions confirms the reliability of the proposed optimization framework. The coupled dynamic equations of motion for the structure - N-TMDI, accounting for SSI effects, are formulated and solved in the time domain using the Newmark-β method. An extensive parametric analysis is conducted to evaluate the effectiveness of the N-TMDI in improving the seismic response of the buildings. The results consistently demonstrate the effectiveness of the proposed protection strategy across a wide range of parametric configurations, highlighting its potential as a viable seismic mitigation strategy for a multi-story building.
AtıfScopus26WoS23OpenAlex19İncele - MakaleAçık Erişim2025Scopus SJRQ1Effect of basic parameters defining principal soil-structure interaction on seismic control of structures equipped with optimum tuned mass damper
Araz, Onur
One of the most effective systems for reducing dynamic responses of the structures subjected to earthquake excitations is tuned mass dampers (TMDs). In the traditional design theory of TMDs, the structures are assumed to be rigidly connected to the ground. Using this approach, known as the fixed foundation approach, may lead to deterioration of the performance of the TMD in cases where soil-structure interaction (SSI) is significant. Therefore, it is crucial to consider the SSI effects to obtain the optimum parameters of the TMDs. Unlike previous studies, two key parameters (i.e., structure-to-soil stiffness ratio and aspect ratio of the structure) are considered, which define the principal SSI effects on the effectiveness of TMD. For the aspect ratio of the structure, three different values (i.e., λ = 1, 2, and 4) are considered, these values correspond to the squat, ordinary, and slender structures representing traditional buildings, respectively. Four different values (i.e., a0 = 0, 0.5, 1, and 2) are also considered for the structure-soil stiffness ratio. This ratio being equal to 0 corresponds to the fixed foundation approach. This also demonstrates that the structure is constructed on hard rock. The optimum parameters of the TMD are obtained using the Jaya algorithm (JA). The proposed methodology is applied to three different buildings (i.e., 3-story, 6-story, and 12-story), and the optimum parameters of the TMD are verified using a total of 72 ground motions corresponding to NEHRP site classes C, D, and E. Numerical results show that the effectiveness of TMD is significantly affected by the basic parameters that define the principal SSI. In addition, the efficiency of the TMD is significantly related to the characteristics of the ground motions. It has been observed that TMD does not perform adequately in reducing vibrations in low-rise buildings (i.e., λ = 1) constructed on low-stiffness soils (i.e., a0 = 2).
AtıfScopus42WoS38OpenAlex34İncele - MakaleYalnız künye2025Scopus SJRQ1Influence of PGA/PGV ratio on the seismic performance of buildings with different slenderness ratios considering soil-structure interaction
Araz, Onur
In this study, the seismic performance of buildings equipped with tuned mass damper (TMD) having different slenderness ratios, subjected to ground motions with varying a wide range of PGA/PGV ratios is investigated, considering soil-structure interaction (SSI). A methodology based on hybrid Genetic Algorithm-Particle Swarm Optimization (GA-PSO) algorithm is proposed to determine the optimal parameters of TMD. For this purpose, three buildings (i.e., 3-story, 6-story, and 12-story buildings) are considered and the dynamic properties of these buildings are determined according to the provisions specified in ASCE-7. These buildings, which are frequently encountered in the traditional building stock, represent low, medium, and high-rise buildings, respectively. In the numerical analysis, three different soil types (i.e., SC, SD, and SE) and 80 ground motions are also considered. These records are divided into three different classes: high, intermediate, and low frequency content. The Newmark integration method is used to determine the dynamic responses of the structures in the time domain analysis. Numerical results show that the frequency content of ground motion and the slenderness ratio have a significant effect in reducing the peak displacement and acceleration responses of structures. The findings also demonstrate that when the PGA/PGV ratio is greater than 2, TMD shows mostly sufficient control performance for all buildings and all support conditions.
AtıfScopus21WoS20OpenAlex17İncele - MakaleYalnız künye2025Scopus SJRQ3Assessment of Seismic Responses of Square-Hollow-Section Joints in a Lattice Girder with Soil-Structure Interaction
Ozturk, Kasif Furkan; Ozyurt, Emre; Araz, Onur; Cakir, Tufan
The fixed base approach is widely used to obtain the seismic behaviour of Square Hollow Section (SHS) joints in a lattice girder. However, in some cases where soil-structure interaction (SSI) can be relatively significant, this approach may result in incorrect acquisition of the natural periods and dynamic responses of the lattice girders using welded tubular joints. This situation may negatively affect the safety of the structure by causing an underestimation of the dynamic loads acting on the structure. Therefore, this study evaluates the seismic behaviour of SHS joints in a typical lattice girder exposed to different ground motions considering SSI. A nonlinear finite element analysis software, Abaqus, performs the dynamic analyses considering six earthquake excitations with three different frequency contents (a ratio of peak ground acceleration (PGA) to peak ground velocity (PGV)) and four different soil types. After verifying the numerical model, it is determined that 3D solid elements should be used to capture the actual seismic behaviour of the tubular joints in a steel truss frame with or without SSI. A comprehensive parametric study is then carried out to evaluate the peak displacement and stress values on the SHS joints with and without SSI under different ground motions with different PGA/PGV ratios. The findings show that the stresses are concentrated around the column and bottom chord connection region. Besides, the SSI mechanism significantly affects the peak stress and displacement values of the SHS joints, especially in soft soil types. Furthermore, it is observed that the PGA/PGV ratio significantly changes the seismic responses of the steel truss frame.
AtıfScopus7WoS7OpenAlex6İncele - MakaleYalnız künye2025Scopus SJRQ1Effect of frequency content of ground motion on seismic response of buildings with variable aspect ratio including soil-structure interaction
Kaya, Dilek; Cakir, Tufan; Ozturk, Kasif Furkan; Araz, Onur
Soil-structure interaction (SSI) may lead to reduction, amplification or negligible change in structural responses depending on the relationship between the nature of excitations and subsoil conditions. Since neglecting SSI effects may cause uncertainties in seismic design, it is crucial to consider them during the design process. Another important factor affecting the dynamic behavior of structures interacting with the ground is the dynamic properties of the structures. To consider this effect, three buildings with 4, 8, and 12 stories designed in accordance with the Turkish Building Earthquake Code (TBEC-2018) are analyzed. The aspect ratios of these structures are 2, 4, and 6, corresponding to squat, ordinary, and slender structures, respectively. The primary objective of this study is to simulate the combined effects of these key parameters on the dynamic response of reinforced concrete structures. In the time history analyses, six ground motions classified by three different frequency contents are considered. 3D finite element models of SSI systems are established using ANSYS software. The usability of the numerical models is demonstrated for both SSI and fixed-base cases through three different analytical approaches. The displacement, acceleration, and stress responses are examined through time history analyses. The results indicate that the SSI is not negligible and neglecting the SSI is an oversimplification that does not lead to always-conservative predictions. Moreover, both the frequency content of the excitation and the structural aspect ratio are found to be decisive parameters in seismic response.
AtıfScopus12WoS12OpenAlex11İncele - MakaleYalnız künye2025Scopus SJRQ2Evaluation of soil-structure resonance by determining local soil conditions in Gümüşhane city center
Altundaş, Suna; Tanış, Abdulsamed
Recent earthquakes have adversely affected human life, highlighting the necessity of identifying structural and ground conditions to assess risky areas and mitigate potential damage from future seismic events. Gümüşhane, the designated study area, is susceptible to the impacts of a possible earthquake due to its proximity to the North Anatolian Fault Zone (NAFZ). Accordingly, vertical electrical sounding (VES), multi-channel analysis of surface waves (MASW), and microtremor methods were employed in the central district of Gümüşhane to characterize local ground conditions and to evaluate the resonance hazard potential arising from the interaction between structures and the underlying soil. Dominant period (T0) and frequency (f0), spectral amplification (A0), soil index of vulnerability (Kg), average S wave velocity for 30 m depth (Vs30), ground type, and soil-structure resonance hazard potential were determined. For the study area, f0 values between 1.32–8.91 Hz (T0 values varied between 0.11–0.76 s), A0 values between 0.93–7.63 according to horizontal/vertical spectral ratio (HVSR) analysis, and Vs30 values were between 390–886 m/sec to MASW. As a result of the evaluation of microtremor measurements made in all buildings using the floor spectral ratio (FSR) technique, the soil-structure potential resonance hazard was found to be low. The present study, conducted in Gümüşhane, examined the subject of soil-structure interaction. In the process of planning new residential areas, it is imperative to ensure the reliability of construction based on the local ground conditions. Furthermore, it is essential to determine the risk status of buildings in relation to potential earthquake movements.
AtıfScopus2WoS2OpenAlex2İncele - MakaleYalnız künye2024Scopus SJRQ1Investigation of dynamic responses of three-sided underpass culvert under near-fault and far-fault ground motions considering soil-structure interaction
Ozturk, Kasif Furkan
Three-sided underpass culverts are structural systems used to provide passing vehicle or pedestrian. It is of great importance that such infrastructure systems remain useable, especially after disasters such as earthquakes that can cause great destruction, in order to ensure that infrastructure services can be maintained continuously. In this context, the aim of this study is to investigate using finite element method (FEM) the dynamic responses of three-sided underpass culvert system under near-fault ground motions with velocity pulse and far-fault ground motions. For this aim, the modal analysis of the soil-underpass culvert interaction system has been realized using proposed soil-structure interaction (SSI) model. The frequencies of the interaction system obtained from the finite element model developed using proposed approaches have been verified comparing with the results obtained from the literature and the site periods. After showing that the modes of the interaction system can be obtained with the help of the proposed numerical model, the full transient dynamic analyses have been performed in the time history using five near-fault and far-fault records, considering four different soil systems. The comparisons shows that the variations of the soil systems and the ground motion type can significantly affect the top peak relative displacements and the dynamic stresses of the three-sided underpass culvert.
AtıfScopus16WoS13OpenAlex15İncele - MakaleAçık Erişim2024Scopus SJRQ1Effect of PGV/PGA ratio on seismic-induced vibrations of structures equipped with parallel tuned mass dampers considering SSI
Araz, Onur
Tuned mass damper is one of the effective methods used to reduce dynamic loads in structures under the influence of environmental loads such as earthquakes, wind, and traffic loads. In the current TMD design, the fixed base approach is mostly considered when determining the dynamic properties of the structure. However, in cases where the structure-soil interaction (SSI) is important, the frequency values of the structure are significantly different from those obtained for the fixed foundation approach. This situation negatively affects the performance of TMD operating in a narrow frequency range. Therefore, using a control system consisting of multiple TMDs connected in parallel (MTMD) instead of a single TMD may be a promising solution for the control of structural vibrations. In this study, a parameter design and efficiency assessment of MTMD for reducing the seismic responses of the structure considering SSI is studied. The particle swarm optimization (PSO) algorithm is adopted to obtain the optimum parameters (i.e., damping ratio, frequency ratio, and frequency bandwidth) of the MTMD. The effects of different support conditions, number of TMD units, and peak ground velocity (PGV) / peak ground acceleration (PGA) ratio on the performance of MTMD are also evaluated comprehensively. The dynamic responses of the structure are obtained under 42 near -fault ground motions from the time history analysis. The results reveal that ground motions with low PGV/PGA ratio can significantly increase the responses of the structure for both with and without SSI cases. Moreover, it has been observed that optimized TMDs placed parallel to the top floor of the structure are effective in reducing the seismic responses of a ten-story building considering SSI.
AtıfScopus35WoS33OpenAlex31İncele - MakaleYalnız künye2023Scopus SJRQ1Seismic-induced vibration control of a multi-story building with double tuned mass dampers considering soil-structure interaction
Araz, Onur; Elias, Said; Kablan, Feyza
This paper presents a methodology for the optimization of double tuned mass dampers (TMDs) positioned on the top floor of a multi-story building subjected to ground motions considering soil-structure interaction (SSI). In the optimization process, it is considered that double TMDs are connected both in series and in parallel. STMD and PTMD are used to denote the series TMDs and parallel TMDs, respectively. The equations of motion for an n-story shear building controlled by STMD and PTMD are derived by considering the SSI effect and the optimum parameters of both devices are obtained by minimizing the amplitude of the displacement transfer function for the top floor of the building in the frequency domain analysis. The effectiveness of the PTMD and STMD designed using the Jaya algorithm (JA) is verified by numerical examples of a ten-story shear building under twelve earthquake records with different frequency content and the comparison with the traditional TMD is also performed. In order to investigate the effect of earthquake frequency content on the control performance of the TMDs, earthquakes considered are divided into three different groups as low, intermediate, and high-frequency contents. In addition, the influence of the soil stiffness on the optimum parameters and effectiveness of the PTMD and STMD is discussed. Numerical results show that the optimally designed PTMD and STMD effectively suppressed the maximum floor displacements and accelerations of the building. It is also shown that SSI effects can be ignored when the building is built on stiff soil. In addition, it is concluded that the SSI and earthquake frequency content have a significant effect on the control performance of TMDs and the seismic response of the building.
AtıfScopus72WoS67OpenAlex71İncele - MakaleYalnız künye2023Scopus SJRQ1Effect of foundation embedment ratio in suppressing seismic-induced vibrations using optimum tuned mass damper
Araz, Onur; Cakir, Tufan; Ozturk, Kasif Furkan; Kaya, Dilek
Tuned mass damper (TMD), which is used in structures to mitigate the dynamic responses caused by environmental loads, is tuned according to the dominant frequency of the structures. The dominant frequency of structure built on soil with low stiffness is significantly affected by the soil-structure interaction (SSI). In previous studies, only the surface foundation case is considered to investigate the design parameters of TMD considering SSI effects and the embedment depth of the foundation is neglected in these studies. Thus, this paper investigates the optimization of TMD for mitigation of responses of a high-rise building considering various depths of embedment and soil properties. The optimum parameters of TMD are investigated using five different optimization algorithms (i.e., simulated annealing, sequential quadratic programming, genetic algorithm, pattern search, and particle swarm optimization). The objective function minimizes the peak acceleration amplitude at the top of the structure. The effectiveness of optimum TMD is verified to use 20 near-fault pulse-like ground motions. The comparisons show that the embedment ratio of the foundation and the soil properties significantly affect the optimization of TMD.
AtıfScopus28WoS26OpenAlex27İncele - MakaleYalnız künye2023Scopus SJRQ3Influences of Wall Configurations on Earthquake Behavior of Cantilever Retaining Walls Considering Soil-Structure Interaction Effects
Ozturk, Kasif Furkan; Cakir, Tufan; Araz, Onur
Cantilever walls are frequently and necessarily built not only in earthquake prone regions but also on different foundation subsoils with various physical and mechanical characteristics. The response of these structures is a complicated soil-structure interaction (SSI) problem, in which the relative stiffness between the soil and structure is of critical importance. In addition to different soil conditions and earthquake motions, the wall configurations have an important role in the cantilever retaining wall design. Thus, the major objective of this work is to investigate the effects of various configurations on seismic response of the cantilever retaining walls considering SSI. Accordingly, the seismic response of the interaction systems is revealed using the 3D finite element models (FEM) in time domain, assuming linearly elastic behavior for the wall, and elastoplastic behavior for backfill and foundation soil. Viscous absorbent boundaries are employed to both simulate radiation scenario and avoid undesirable wave reflections generated by soil lateral boundaries. Backfill-wall interfaces are modeled using the unidirectional interface elements with nonlinear force-deflection abilities. The interaction systems are analyzed considering three different cantilever wall configurations (inverted T-type, L-type, and the wall with a base key), four different ground motion records, and four different subsoil systems. Nonlinear seismic analyses are carried out to visit how considering the variation of these parameters influences the wall behavior. The results from parametric studies show that the wall configuration, SSI effects and ground motions are remarkably influential on seismic responses of the cantilever walls such as the stresses and horizontal displacements.
AtıfScopus16WoS15OpenAlex16İncele - MakaleYalnız künye2023Scopus SJRQ1Optimum tuned tandem mass dampers for suppressing seismic-induced vibrations considering soil-structure interaction
Araz, Onur; Noroozinejad Farsangi, Ehsan
In recent studies, it has been stated that tuned tandem mass dampers (TTMD) will be a practical mechanical solution to reduce the dynamic responses of structures under seismic excitations. However, since TTMD is tuned based on the dominant frequency of the superstructure, ignoring the soil-structure interaction (SSI), it may cause a notable deterioration in the control performance of the control devices. Thus, a methodology for the optimum design of TTMD positioned on the top story of a high-rise building due to near-fault pulse-like ground motions considering potential SSI effects has been investigated in this paper. Firstly, the TTMD is located on the top story of a well-known 40-story shear building, and the equations of motion for soil-structure-TTMD interaction are derived. Based on the sequential quadratic programming (SQP), the tuning parameters of TTMD are then found for different support conditions in the frequency domain. The efficiency of SQP is also compared with two meta-heuristic algorithms (i.e., simulated annealing and pattern search algorithms). The effectiveness of optimum TTMD is tested using 30 near-fault pulse-like ground motions using time-domain analyses. Numerical results showed that the optimum TTMD is more effective in suppressing the maximum displacement and inter-story drift of the building, considering SSI. It is also found that the frequency content of the earthquake, as well as the pulse period of the earthquake and soil type, has a significant effect on the control performance of the TTMD.
AtıfScopus35WoS36OpenAlex34İncele - Yüksek Lisans TeziAçık Erişim2022Yapı zemin etkileşimi dikkate alınarak sismik etkiler altındaki bir yapı için seri bağlı ayarlı kütle sönümleyicilerin optimizasyonu
Feyza Kablan
Bu tez çalışmasında, sismik yükler altındaki bir yapıdaki dinamik tepkilerin azaltılmasında seri bağlı ayarlı kütle sönümleyicinin kontrol performansı araştırılmıştır. Sayısal sonuçların elde edilmesinde 12 farklı deprem kaydı ve 3 farklı zemin sınıfı dikkate alınmıştır. Seri bağlı ayarlı külte sönümleyiciye ait optimum parametrelerin elde edilmesinde genetik algoritma yöntemi kullanılmıştır. Çalışma sonucunda, depremin frekans içeriğinin ve yapı zemin etkileşiminin seri bağlı ayarlı kütle sönümleyicilerin kontrol performansı üzerinde önemli bir etkiye sahip olduğu görülmüştür. Ayrıca, seri bağlı ayarlı kütle sönümleyici için elde edilen sonuçlar klasik ayarlı kütle sönümleyiciyle karşılaştırılmıştır.
- MakaleAçık Erişim2022Scopus SJRQ2Optimization of tuned mass damper inerter for a high-rise building considering soil-structure interaction
Araz, Onur
The dynamic responses of the buildings and the optimum parameters of tuned mass damper inerter (TMDI) may change significantly when soil-structure interaction (SSI) is considered. Thus, it is necessary to consider the effect of the SSI in the optimization of TMDI. The study aims at proposing a methodology for optimization of TMDI parameters in reducing maximum structural responses of a high-rise building under earthquake considering the SSI effects. The equations of motion for time-domain analysis are derived for obtaining seismic-induced vibrations of a multi-story shear building with TMDI when the SSI is considered. An improved particle swarm optimization (IPSO) is used to obtain the optimum parameters. The aim of the optimization is to reduce the amplitude of the acceleration transfer function (ATF). The effectiveness of the optimally designed TMDI is assessed for twelve earthquake records with different frequency contents. The effect of the different mass ratios (µ), inertance ratios (β) and support conditions on control performance of the TMDI are investigated in detail. Numerical results proved that the SSI effect and the inertance ratio have a significant impact on the optimal design and effectiveness of the TMDI. From the seismic analysis results, it is seen that the controlled displacement response usually increases with the increase in the inertia ratio for both the fixed and flexible foundation, and a lower seismic response is obtained in the building controlled by TMD compared with the TMDI with different inertance ratios.
AtıfScopus40WoS41OpenAlex39İncele - Yüksek Lisans TeziAçık Erişim2018Zemin-yapı etkileşimi ve farklı duvar geometrileri dikkate alınarak konsol istinat duvarlarının sismik davranışının incelenmesi
Kaşif Furkan Öztürk
İstinat duvarları çok farklı amaçlarla birçok inşaat mühendisliği uygulamasında yaygın olarak kullanılan özel mühendislik yapılarıdır. Bunlara örnek olarak; büyük miktarlarda yarma ve dolgu gerektiren yol inşaatları, kanallar ve su depoları, köprü kenar ayakları, malzeme depolama alanları, erozyon ve taşkın alanları verilebilir. İstinat duvarlarının farklı zemin koşullarında ve yükleme durumlarındaki davranışlarının belirlenmesi ve tasarım öncesi değerlendirilmesi kritik bir öneme sahiptir. Ayrıca Türkiye gibi aktif deprem kuşağında bulunan ülkelerde, işlevsel olarak birçok amaca hizmet edebilen istinat duvarlarının statik davranışlarının belirlenmesi yanında, dinamik davranışlarının belirlenmesi de önemli olmaktadır. İstinat duvarlarının sismik analizi ve tasarımı genellikle Mononobe-Okabe yöntemini esas alan sözde statik yaklaşımlarla yapılmaktadır. Mononobe-Okabe yöntemiyle istinat duvarlarına etkiyen sismik zemin basınçları, duvar arkasındaki zemin kamasına etkiyen kuvvetlerin dengesinden elde edilmekte ve bu yöntemde dalga yayılım etkileri ile zemin-yapı etkileşimi dikkate alınmamaktadır. Ancak istinat duvarlarının dolgu ve temel zemini ile olan etkileşimleri ve dalga yayılım etkileri bu yapıların deprem davranışlarını oldukça karmaşık bir probleme dönüştürmektedir. Bu çalışmanın temel amacı, zemin-yapı etkileşimini ve farklı duvar geometrilerini dikkate alarak dolgu-konsol istinat duvarı-temel/zemin sistemlerinin farklı yer hareketleri etkisi altında sismik davranışını incelemektir. Bu amaç doğrultusunda, dört farklı temel zemini koşulu, üç farklı duvar geometrisi ve iki farklı deprem yer hareketi dikkate alınarak zaman ortamında sonlu elemanlar yöntemine dayalı sismik çözümlemeler gerçekleştirilmiştir. Çözümlemelerde 1999 Kocaeli Depremi Yarımca kaydı Kuzey-Güney bileşeni ve 1989 Loma Prieta Depremi Hollister-South & Pine kaydı HSP000 bileşeni dikkate alınmıştır. Bu çalışma üç bölümden oluşmaktadır. Birinci bölümde istinat duvarları, malzemelerin doğrusal olmayan davranışı, zemin-yapı etkileşimi hakkında genel bilgiler ile çalışmanın amacı ve kapsamı sunulmaktadır. İkinci bölümde, dolgu-konsol istinat duvarı-temel/zemin sistemleri için önerilen sayısal modeller tanıtılmakta ve bu sistemlerin dinamik çözümlemeleri gerçekleştirilmektedir. Üçüncü bölümde, çalışmadan elde edilen sonuçlar ve öneriler verilmektedir. Bu bölümü kaynaklar listesi ve özgeçmiş izlemektedir. Sonuç olarak bu çalışmada, konsol istinat duvarlarının sismik davranışının zemin-yapı etkileşimine, duvar geometrisine ve deprem frekans içeriğine bağlı olarak önemli mertebelerde değişebileceği görülmüştür. Ayrıca duvar kesitinin ve zemin etkileşiminin duvara etkiyen dinamik zemin basınçlarının büyüklüğünü etkileyebileceği belirlenmiştir. Bu bağlamda, gerçekçi ve güvenilir bir tasarım için bu etkilerin tasarım aşamasında dikkate alınması gerektiği ifade edilebilir. Anahtar Kelimeler: Dalga Yayılımı, Deprem Frekans İçeriği, Konsol İstinat Duvarı, Sismik Davranış, Sonlu Elemanlar Yöntemi, Zemin-Yapı Etkileşimi
- MakaleYalnız künye2015DYNAMIC DISPLACEMENT AND STRESS ANALYSES OF CANTILEVER RETAINING WALLS CONSIDERING SOIL-STRUCTURE INTERACTION AND WALL FLEXIBILITY
Çakir, Tufan; Dag, Serhat
The Mononobe-Okabe (M-O) method based on limit equilibrium principle is widely used in the design of retaining structures against earthquake loads. However, this method does not consider the soil-structure interaction and wave propagation effects. On the other hand, it is known that the interactions of retaining structures with backfill and foundation soils transform the seismic behavior of these structures to a rather complex problem. The main purpose of this study is to evaluate the soil-structure interaction and wall flexibility effects on the seismic behavior of backfill-cantilever retaining wall-foundation/soil systems. In line with this target, three dimensional finite element models were utilized for analyzing the aforementioned systems. Seismic analyses were carried out in the time domain by considering five different foundation soil conditions and two different wall thicknesses. The results were comparatively interpreted in terms of lateral wall displacements and the stresses occurring at critical sections of the wall. It was observed that these responses may vary significantly due to soil-structure interaction and wall flexibility effects.
AtıfWoS1İncele - MakaleYalnız künye2014Scopus SJRQ3Backfill and subsoil interaction effects on seismic behavior of a cantilever wall
Cakir, Tufan
The main focus of the current study is to evaluate the dynamic behavior of a cantilever retaining wall considering backfill and soil/foundation interaction effects. For this purpose, a three-dimensional finite element model (FEM) with viscous boundary is developed to investigate the seismic response of the cantilever wall. To demonstrate the validity of the FEM, analytical examinations are carried out by using modal analysis technique. The model verification is accomplished by comparing its predictions to results from analytical method with satisfactory agreement. The method is then employed to further investigate parametrically the effects of not only backfill but also soil/foundation interactions. By means of changing the soil properties, some comparisons are made on lateral displacements and stress responses. It is concluded that the lateral displacements and stresses in the wall are remarkably affected by backfill and subsoil interactions, and the dynamic behavior of the cantilever retaining wall is highly sensitive to mechanical properties of the soil material.
AtıfScopus21WoS18OpenAlex19İncele
