The aim of this study is to evaluate the existence of torsion due to nonlinear behavior of latera... more The aim of this study is to evaluate the existence of torsion due to nonlinear behavior of lateral load resisting elements during moderate or strong earthquakes and to check the validity of pushover analysis of existing regular buildings. Therefore, torsion due to unsymmetrical distribution of lateral load resisting elements in the plan of the structure is not in the scope of the current study. Two reference RC buildings, 4and 7-story, are selected for the purpose the current study. The other set of buildings is obtained from reference buildings by adding heavy overhangs with and without edge beams. The building models considered in the current study are subjected to 12 ground motion records using SAP2000 program to carry out nonlinear time history analyses. Displacement demands at the center of mass and corner points of the building were obtained for both X and Y directions. The maximum interstory displacement drift demand ratio (IDR) values are determined. Then, torsional irregula...
Inadequate separations cause lateral collision of adjacent buildings during earthquakes. This col... more Inadequate separations cause lateral collision of adjacent buildings during earthquakes. This collision refers to seismic pounding and imposes an unexpected impact loading on buildings causing heavy damages or collapses. Building damages due to pounding have been reported from major past earthquakes such as 1964 Alaska, 1971 San Fernando, 1985 Mexico City, 1989 Loma Prieta, 1999 Chi-Chi and 1999 Kocaeli Earthquakes. Major ratio of existing building stock has potential pounding risk in possible future earthquakes in Turkey. This study investigates the effects of pounding on seismic behaviour of inadequately separated mid-rise reinforced concrete buildings in Turkey. Three different models are used to evaluate seismic performance of adjacent buildings; 4-story building per 1975 Turkish Earthquake Code (TEC), 7-story building per 1975 and 1998 TEC are used to represent mid-rise reinforced concrete buildings. The selected buildings have reinforced concrete frame systems without shear wa...
This study aims to evaluate the effect of soil structure interaction and the differences in linea... more This study aims to evaluate the effect of soil structure interaction and the differences in linear and nonlinear modelling of the structure on seismic response. For this purpose, SSI and fixed base models of 7-story building were used. Both linear and nonlinear behavior of the building are taken into account for comparison. The findings obviously indicate large variation in displacement demands depending on ground motion record, soil type, consideration of soil structure interaction and linear and nonlinear structure modelling. The displacement demands tend to increase for softer soils except few cases, especially for fixed base models. Significant differences are obvious for linear and nonlinear building models of fixed base case. The evaluation of obtained results and observations in the current study clearly indicate that the effects of SSI approach depend on dynamic characteristics of soil and structure. While soil deformations influence the seismic demands of structure in posit...
Determining the dynamic properties of structures is important for understanding their seismic beh... more Determining the dynamic properties of structures is important for understanding their seismic behaviour. Ambient vibration signal measurement is one of the approaches used to determine the period of structures. Advantages of this method include the possibility of taking real-time records and presenting nondestructive and rapid solutions. In this study, natural vibration periods are calculated by taking ambient vibration signal records from 40 buildings. The height of the building, infill wall effect, presence of seismic retrofit, and presence of damage are taken into consideration, and their effects on natural vibration periods are investigated. Moreover, the results are compared with the analytical methods to reveal the differences. A significant correlation between the period and height of the building is observed. It is seen that the natural vibration periods of the buildings decrease by 7% to 30% (15% on average) due to infill wall contribution. However, the efficiency of infill...
Aktif bir deprem kuşağı üzerinde yer alan ülkemizde çok kısa denebilecek zaman aralıkları içerisi... more Aktif bir deprem kuşağı üzerinde yer alan ülkemizde çok kısa denebilecek zaman aralıkları içerisinde yıkıcı depremler meydana gelmiş ve birçok betonarme yapı hasar görmüştür. Bu çalışmanın amacı, deprem riski yüksek olan ülkemiz yapı stoğunun büyük bir bölümünü oluşturan ...
Ülkemiz coğrafi konumu ve sahip olduğu yapı stoğu gereği oldukça ciddi deprem tehdidi altındadır.... more Ülkemiz coğrafi konumu ve sahip olduğu yapı stoğu gereği oldukça ciddi deprem tehdidi altındadır. Deprem zararlarının en aza indirilmesi ülkemizin en önemli problemlerinden biridir. Bu nedenle bu konuyla ilgili bilimsel gelişmelerin yakından takip edilmesi ...
The aim of this study is to evaluate the existence of torsion due to nonlinear behavior of latera... more The aim of this study is to evaluate the existence of torsion due to nonlinear behavior of lateral load resisting elements during moderate or strong earthquakes and to check the validity of pushover analysis of existing regular buildings. Therefore, torsion due to unsymmetrical distribution of lateral load resisting elements in the plan of the structure is not in the scope of the current study. Two reference RC buildings, 4and 7-story, are selected for the purpose the current study. The other set of buildings is obtained from reference buildings by adding heavy overhangs with and without edge beams. The building models considered in the current study are subjected to 12 ground motion records using SAP2000 program to carry out nonlinear time history analyses. Displacement demands at the center of mass and corner points of the building were obtained for both X and Y directions. The maximum interstory displacement drift demand ratio (IDR) values are determined. Then, torsional irregula...
Inadequate separations cause lateral collision of adjacent buildings during earthquakes. This col... more Inadequate separations cause lateral collision of adjacent buildings during earthquakes. This collision refers to seismic pounding and imposes an unexpected impact loading on buildings causing heavy damages or collapses. Building damages due to pounding have been reported from major past earthquakes such as 1964 Alaska, 1971 San Fernando, 1985 Mexico City, 1989 Loma Prieta, 1999 Chi-Chi and 1999 Kocaeli Earthquakes. Major ratio of existing building stock has potential pounding risk in possible future earthquakes in Turkey. This study investigates the effects of pounding on seismic behaviour of inadequately separated mid-rise reinforced concrete buildings in Turkey. Three different models are used to evaluate seismic performance of adjacent buildings; 4-story building per 1975 Turkish Earthquake Code (TEC), 7-story building per 1975 and 1998 TEC are used to represent mid-rise reinforced concrete buildings. The selected buildings have reinforced concrete frame systems without shear wa...
This study aims to evaluate the effect of soil structure interaction and the differences in linea... more This study aims to evaluate the effect of soil structure interaction and the differences in linear and nonlinear modelling of the structure on seismic response. For this purpose, SSI and fixed base models of 7-story building were used. Both linear and nonlinear behavior of the building are taken into account for comparison. The findings obviously indicate large variation in displacement demands depending on ground motion record, soil type, consideration of soil structure interaction and linear and nonlinear structure modelling. The displacement demands tend to increase for softer soils except few cases, especially for fixed base models. Significant differences are obvious for linear and nonlinear building models of fixed base case. The evaluation of obtained results and observations in the current study clearly indicate that the effects of SSI approach depend on dynamic characteristics of soil and structure. While soil deformations influence the seismic demands of structure in posit...
Determining the dynamic properties of structures is important for understanding their seismic beh... more Determining the dynamic properties of structures is important for understanding their seismic behaviour. Ambient vibration signal measurement is one of the approaches used to determine the period of structures. Advantages of this method include the possibility of taking real-time records and presenting nondestructive and rapid solutions. In this study, natural vibration periods are calculated by taking ambient vibration signal records from 40 buildings. The height of the building, infill wall effect, presence of seismic retrofit, and presence of damage are taken into consideration, and their effects on natural vibration periods are investigated. Moreover, the results are compared with the analytical methods to reveal the differences. A significant correlation between the period and height of the building is observed. It is seen that the natural vibration periods of the buildings decrease by 7% to 30% (15% on average) due to infill wall contribution. However, the efficiency of infill...
Aktif bir deprem kuşağı üzerinde yer alan ülkemizde çok kısa denebilecek zaman aralıkları içerisi... more Aktif bir deprem kuşağı üzerinde yer alan ülkemizde çok kısa denebilecek zaman aralıkları içerisinde yıkıcı depremler meydana gelmiş ve birçok betonarme yapı hasar görmüştür. Bu çalışmanın amacı, deprem riski yüksek olan ülkemiz yapı stoğunun büyük bir bölümünü oluşturan ...
Ülkemiz coğrafi konumu ve sahip olduğu yapı stoğu gereği oldukça ciddi deprem tehdidi altındadır.... more Ülkemiz coğrafi konumu ve sahip olduğu yapı stoğu gereği oldukça ciddi deprem tehdidi altındadır. Deprem zararlarının en aza indirilmesi ülkemizin en önemli problemlerinden biridir. Bu nedenle bu konuyla ilgili bilimsel gelişmelerin yakından takip edilmesi ...
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