Turan, Gürsoy
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Turan, Gursoy
Turan, G
Turan, G.
Turan, G
Turan, G.
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gursoyturan@iyte.edu.tr
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03.03. Department of Civil Engineering
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Current Staff
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Sustainable Development Goals
1NO POVERTY
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2ZERO HUNGER
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3GOOD HEALTH AND WELL-BEING
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4QUALITY EDUCATION
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5GENDER EQUALITY
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6CLEAN WATER AND SANITATION
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7AFFORDABLE AND CLEAN ENERGY
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8DECENT WORK AND ECONOMIC GROWTH
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9INDUSTRY, INNOVATION AND INFRASTRUCTURE
5
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10REDUCED INEQUALITIES
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11SUSTAINABLE CITIES AND COMMUNITIES
4
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12RESPONSIBLE CONSUMPTION AND PRODUCTION
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13CLIMATE ACTION
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14LIFE BELOW WATER
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15LIFE ON LAND
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16PEACE, JUSTICE AND STRONG INSTITUTIONS
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17PARTNERSHIPS FOR THE GOALS
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Documents
18
Citations
443
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8
This researcher does not have a WoS ID.
Scholarly Output
30
Articles
16
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18683/11745
Supervised MSc Theses
9
Supervised PhD Theses
4
WoS Citation Count
264
Scopus Citation Count
441
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0
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5
WoS Citations per Publication
8.80
Scopus Citations per Publication
14.70
Open Access Source
22
Supervised Theses
13
| Journal | Count |
|---|---|
| Structural Design of Tall and Special Buildings | 2 |
| Teknik Dergi | 2 |
| Experimental Techniques | 1 |
| Innovative Infrastructure Solutions | 1 |
| Journal of Bridge Engineering | 1 |
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30 results
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Now showing 1 - 10 of 30
Master Thesis Earthquake Response of R/C Frames With Reinforced Infill Walls(Izmir Institute of Technology, 2008) Yıldırım, Umut; Turan, GürsoyMost of the reinforced concrete structures that are built in the past few decades are in lack of ductility and lateral stiffness. In the content of the present work, a fast and economical remedy was searched to rehabilitate these type of buildings that are under high risk of earthquake damage.The strengthening technique needs to be finished in a short time without the people that live inside the buildings to move out. Furthermore, the chosen strengthening technique needs to be economical enough so that the home owner would not hesitate in making a decision of the rehabilitation.In regard of the above mentioned two criteria, existing infill clay brick walls may be strengthened by the addition of a wire mesh on the surface together with a layer of plaster. In order to investigate its effectiveness, a numerical investigation is carried out to study the behaviour of a strengthened infilled reinforced concrete (RC) frame using wire mesh under lateral reversed cyclic loading. A single span, one-story clay brick infilled RC frame is modeled and a nonlinear analysis is made.The analysis results indicate that the technique of strengthening with wire meshincreased the peak lateral load, ductility and energy dissipation.Article Citation - WoS: 1Citation - Scopus: 1Effect of Soil Water Content Changes on the Behavior of Buildings Equipped With Single and Double Tuned Mass Dampers Subjected To Earthquakes(Springer Science and Business Media Deutschland GmbH, 2025) Roozbahan, M.; Turan, G.Tuned mass dampers (TMDs) are one of the structural control systems that have been frequently used in the last century. A TMD is designed according to the properties of the main system. In building applications, the substructure’s soil affects the response of buildings, especially in soft-type soils. Therefore, the soil properties should be included in the analysis and design of tuned mass dampers. However, the soil properties are not always identical and vary due to different factor changes such as soil water content changes. Unlike previous research, which typically assumes constant soil properties, this study incorporates the impact of soil water content changes, a key factor that can significantly alter soil behavior. This study aims to evaluate the effectiveness of optimized single and double tuned mass dampers (DTMDs) in response reduction of buildings considering the changes in the water content of soil. In this study, a metaheuristic-based optimization method is programmed to optimize TMDs and DTMDs for low-, mid-, and high-rise buildings considering soil-structure interaction (SSI). The efficiency of the optimized tuned mass dampers on the response reduction of buildings due to changes in soil water content is evaluated. According to the investigated results of 14 near-field earthquake simulations, it is concluded that the efficiency of the TMDs is significantly affected by changes in soil water content. Moreover, according to the result, the DTMD efficiency is slightly better than the TMD-controlled structure. © Springer Nature Switzerland AG 2025.Doctoral Thesis Modal Identification of Structures by Using Bayesian Statistics(Izmir Institute of Technology, 2019) Hızal, Çağlayan; Hızal, Çağlayan; Turan, Gürsoy; Turan, GürsoyBayesian Probabilistic approaches in the health monitoring of civil engineering structures has gained remarkable interest during past decades. When compared to the available Operational Modal Analysis (OMA) methods, Bayesian Operational Modal Analysis (BAYOMA) determines a probabilistic range with a most probable value and uncertainty instead of a certain result. For this reason, the most important difference of BAYOMA lies in its capability of uncertainty quantification. Therefore, the modal parameters of a measured structure can be determined based on a probabilistic logic according to various cases (for example single measurement setup, well separated and/or closely spaced modes, multiple measurement setups). Further, the finite element model of the investigated structure can also be updated by a Bayesian approach incorporated with modal identification procedure. Some efficient BAYOMA methods such as Bayesian Spectral Density Approach (BSDA) and Bayesian Fast Fourier Transform Approach (BFFTA) have been presented by various researchers during the past two decades. Despite their efficient and fast solution procedure, the available methods have some critical issues that need to be solved. Most of these problems especially lie in the quantification of posterior uncertainties and some special cases arise in closely spaced modes and/or multiple setup measurement cases. In the literature, solutions for the aforementioned problems have been also presented by various researchers. In the light of the accumulated knowledge in the literature, this study presents a computational framework for BAYOMA and Bayesian Model Updating (BMU). In addition to some improvements to the available methods, new and alternative approaches are presented for BAYOMA and BMU. According to the results, it is seen that the quality of identified modal parameters and updated finite element models increases significantly by the proposed computational procedure.Article Mesnetlerinden Farklı Yer Hareketlerine Maruz Çok Katlı Çerçevelerin Deplasman Yüklemesine Göre Analizi(Turkish Chamber of Civil Engineers, 2019) Hızal, Çağlayan; Turan, GürsoyIn seismic analysis of structures, generally it is assumed that all supports are subjected to identical ground motions. This approach is assumed to be realistic when the foundation of the structure is formed as a rigid plate, but it cannot consider the dynamic effects of the earthquake wave propagation if the supports are able to move independently. In this study, the multi-support excitation analysis of multi-story, multi bay frames is performed by using displacement loading which defines the seismic load depending on the ground displacement. The modal analysis procedure of the structures subjected to multi-support excitations is given in detail and the effect of pseudo-static displacement on the dynamic response of the structure is highlighted. A static correction approach is implemented with a numerical example to reflect the higher mode effects which are a natural result of displacement loading.Master Thesis Preliminary Design and Analysis for Immersed Tube Tunnel Across the Izmir Bay(Izmir Institute of Technology, 2008) Kartaltepe, Nisa; Turan, GürsoyIn this study, a preliminary design and analysis of an immersed tube tunnel is presented. The tube tunnel will connect the two coasts of the İzmir Bay and whereby will ease the transportation of the city. The reason to suggest an immersed tube tunnel is due to the shallow water depth (<25 m) and that the soil profile of the İzmir Bay is made up of silty-sand. Hence, the Bay is appropriate for an immersed tube tunnel.First, a possible alignment was assigned for the tunnel. The technical, geometric properties of the tubes were determined, and the detailed drawings of them were made.The allowable bearing capacity of the seabed was calculated and it was determined that the soil has not enough capacity to withstand the design load. The liquefaction risk of the soil was investigated as well, and it was shown that the soil has high liquefaction potential.A static analysis of the tunnel was made in Calculix, a finite element program.The vertical displacement of the tube unit under static loads was calculated to be above the permissible settlement value. Afterwards, the seismic analysis was made to investigate stresses developed due to both racking and axial deformation of the tunnel during an earthquake. It was found that, the max stress due to the racking effect is less than the compressive strength of the concrete, and max stress due to the axial deformation is larger than compressive strength of the concrete. The high in the tube occur, because of the tubes high stiffness. This problem was solved by releasing the rigid connections in between two tube units. If these connections are made by using same form of elastomer joints, the deformation will occur in these joints, releasing the tubes internal stresses.Considering these drawbacks, ground improvement was recommended for the seabed and an increased value of the standard penetration of the soil was estimated.Then, the analyses were repeated and it was found that all drawbacks were eliminated.As a conclusion, it was decided that if suggested improvements are made in the seabed soil, the immersed tube tunnel can be constructed across the İzmir Bay.Article Citation - Scopus: 5Efficiency Evaluation of Single and Double Tuned Mass Dampers on Building Response Reduction by Considering Soil-Structure Interaction(Springer Nature, 2024) Roozbahan,M.; Turan,G.Tuned mass dampers (TMDs) and multiple tuned mass dampers (MTMDs) are among the simplest, most reliable, and most frequently employed structural control devices. The efficiency of TMDs and MTMDs depends on their parameters, including the mass, frequency ratio, and damping ratio. Several analytical and metaheuristic methods have been proposed for the optimal design of tuned mass dampers. The aims of this study are: (1) to investigate the differences in efficiency between a number of TMD design methods and (2) to evaluate the differences in efficiency between a single TMD and double TMD (DTMD) in reducing the seismic response of structures by considering soil-structure interactions (SSI). In the first numerical study, the effectiveness of TMDs optimized using seven analytical methods, and TMD and DTMD optimized using a metaheuristics algorithm called Mouth Brooding Fish (MBF) in reducing the response of a fifteen-story structure under 22 far-field and 14 near-field earthquakes is compared. In the second example, in addition to the seven analytical-based designed TMDs, and MBF-based TMDs and DTMDs, the Jaya algorithm based, and plasma generation optimization-based designed TMDs are used, and the same procedure is applied to a forty-story structure. The results show that there is no important difference among these methods, which may indicate that the uppermost optimization level for a regular TMD has been reached. Furthermore, the results indicate that the TMD and DTMD are almost equally effective at reducing the seismic response of structures when the SSI effect is taken into consideration. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2024.Article Citation - WoS: 132Citation - Scopus: 183Phase I Benchmark Control Problem for Seismic Response of Cable-Stayed Bridges(American Society of Civil Engineers (ASCE), 2003) Dyke, Shirley J.; Caicedo, Juan Martin; Turan, Gürsoy; Bergman, Lawrence A.; Hague, Steven T.This paper presents the problem definition for the first generation of benchmark structural control problems for cable-stayed bridges. The benchmark problem is based on the Bill Emerson Memorial Bridge that is currently under construction in Cape Girardeau, Missouri. Construction of the bridge is expected to be completed in 2003. The goal of this study is to provide a testbed for the development of strategies for the control of cable-stayed bridges. Based on detailed drawings, a three-dimensional evaluation model has been developed to represent the complex behavior of the full scale benchmark bridge. The linear evaluation model is developed using the equations of motion generated around the deformed equilibrium position. Evaluation criteria are selected that are consistent with the goals of seismic response control of a cable-stayed bridge. Control constraints ensure that the results are representative of a control implementation on the physical structure. Each participant in this benchmark study is given the task of defining (including devices, sensors, and algorithms), evaluating, and reporting on their proposed control strategies. These strategies may be either passive, active, semiactive, or a combination thereof. A simulation program is provided to facilitate direct comparison of the capabilities and efficiency of the various control strategies. The problem is available through the internet in the form of a set of MATLAB programs and includes a sample control design to guide participants through the benchmark problem.Article Citation - WoS: 24Citation - Scopus: 30Energy Dissipation and Performance Assessment of Double Damped Outriggers in Tall Buildings Under Strong Earthquakes(John Wiley and Sons Inc., 2019) Morales-Beltran, Mauricio; Turan, Gürsoy; Dursun, Onur; Nijsse, RobThe use of a single set of outriggers equipped with oil viscous dampers increases the damping ratio of tall buildings in about 6–10%, depending on the loading conditions. However, could this ratio be further increased by the addition of another set of outriggers? Should this additional set include dampers too? To answer these questions, several double damped outrigger configurations for tall buildings are investigated and compared with an optimally designed single damped outrigger, located at elevation 0.7 of the total building's height (h). Using free vibration, double outrigger configurations increasing damping up to a ratio equal to the single-based optimal are identified. Next, selected configurations are subjected to several levels of eight ground motions to compare their capability for avoiding damage under critical excitations. Last, a simplified economic analysis highlights the advantages of each optimal configuration in terms of cost savings. The results show that, within the boundaries of this study, combining a damped outrigger at 0.5h with a conventional outrigger at 0.7h is more effective in reducing hysteretic energy ratios and economically viable if compared with a single damped outrigger solution. Moreover, double damped outrigger configurations for tall buildings exhibit broader display of optimal combinations, which offer flexibility of design to the high-rise architecture.Master Thesis Modal Parameter Identification of Civil Engineering Structures by Using an Output-Only System Identification Technique(Izmir Institute of Technology, 2015) Ceylan, Hasan; Turan, GürsoyCivil engineering structures are designed for a limited lifetime. Due to environmental effects and degradation of these structures, engineers need to decide on their structural safety and sustainability from time to time. To this end, structural health monitoring techniques could be employed to determine the current structural state. Current conditions of structures could be investigated by system identification techniques that is based on the modal parameters (modal frequencies, modal damping ratios and mode shapes) of structures. In this thesis, output-only system identification of civil structures is studied to estimate modal parameters of two different types of structures. For this purpose, a combination of the Natural Excitation Technique (NExT) and the Eigensystem Realization Algorithm (ERA) is coded within Matlab environment. The first study consists of a numerical and an experimental phase. In the numerical phase, the technique is implemented on the mathematical model of a three-story model building. In the experimental phase, it is implemented on the physical model of this three-story model building. 10 different scenarios of structural conditions are simulated by means of changes in story masses of the structure. By using NExT-ERA, the calculated modal frequencies and mode shapes are in good agreement with the results of the eigenvalue analysis. Further, the simulated mass change in each scenario is detected by a least squares approach. Changes in story masses are detected within reasonable errors. In the second study, a methodology is proposed to acquire measurements of large structures by using a few sensors, only. These sensors are used in a segmental way to measure the whole structure. The sensors are grouped and the groups of sensors are shifted on the model to obtain the response measurements from the whole structure. Then the grouped response measurements that are obtained at different time frames are transformed into the equivalent response data as if being acquired at a single time interval. To implement the methodology, a finite element model of a continuous beam bridge is constructed. Modal parameters of the model are estimated by using NExT-ERA and the results show that the first 10 modal frequencies are consistent with those of the eigenvalue analysis of the model, but only the first 6 mode shapes are successfully identified.Article Citation - WoS: 2Citation - Scopus: 2Effect of Seismic Wave Velocity on the Dynamic Response of Multi-Story Structures on Elastic Foundation(Elsevier Ltd., 2018) Hızal, Çağlayan; Turan, GürsoyTraveling wave effects are generally considered with three main cases: (i) Wave passage effect that results with time delay in earthquake motion. (ii) incoherence effect which is defined as loss of coherency in the ground motion due to the reflection and refraction of waves, and (iii) local site effects. For multi-story structures whose supports are close to each other, the incoherence and local site effect may be omitted. In this case, traveling waves result only in a pure time delay in the earthquake motion (wave passage effect). Due to the wave passage effect of vertical and/or horizontal ground motion, the superstructure needs to be analyzed by multi-support excitation. Raft foundations cannot constrain vertical deformations and/or rotations, but they cause a diaphragm effect in the horizontal direction which results in uniform excitation. In this study, the effect of vertical earthquake motions onto multi-story buildings on elastic soil is investigated. Multi support excitation is considered by using displacement loading, which defines the equivalent seismic loads in terms of the ground displacement. According to the performed simulations of the selected structures, it is shown that structural height has a direct influence that results in member force magnifications with slow traveling wave effect. Among these, the ground floor column axial forces are most affected.
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