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A. R. Habibi, Keyvan Asadi,
Volume 12, Issue 1 (Transaction A: Civil Engineering March 2014)

Setback in elevation of a structure is a special irregularity with considerable effect on its seismic performance. This paper addresses multistory Reinforced Concrete (RC) frame buildings, regular and irregular in elevation. Several multistory Reinforced Concrete Moment Resisting Frames (RCMRFs) with different types of setbacks, as well as the regular frames in elevation, are designed according to the provisions of the Iranian national building code and Iranian seismic code for the high ductility class. Inelastic dynamic time-history analysis is performed on all frames subjected to ten input motions. The assessment of the seismic performance is done based on both global and local criteria. Results show that when setback occurs in elevation, the requirements of the life safety level are not satisfied. It is also shown that the elements near the setback experience the maximum damage. Therefore it is necessary to strengthen these elements by appropriate method to satisfy the life safety level of the frames.
Alireza Habibi, Ehsan Jami,
Volume 15, Issue 2 (Transaction A: Civil Engineering 2017)

The seismic performance levels are discrete damage states selected from among the infinite spectrum of possible damage states that buildings could experience as a result of earthquake response. The observation of building damage during strong motion earthquakes showed that correlation of structural damage with a single parameter such as peak ground acceleration or the total seismic duration is low while peak ground acceleration is often used as a main seismic parameter to evaluate seismic performance of structures. Main objective of this study is to determine the relationship between several seismic acceleration parameters and the Target Displacement (TD) of steel frame structures, which is an important parameter to identify performance levels. For this purpose, first, nonlinear analysis is performed on the SAC 3- and 9-story frames subjected to several far-field earthquakes and then target displacements and seismic parameters are calculated for each structure.The relationship between the target displacement and seismic parameters is evaluated in the form of correlation coefficient. It is shown that PGA has poor correlation with the target displacement. On the other hand, HOUSNER intensity, spectral pseudo-acceleration, spectral pseudo-velocity and peak ground velocity exhibit strong correlation with TD.

Alireza Habibi, Keyvan Asadi,
Volume 15, Issue 4 (Transaction A: Civil Engineering 2017)

One kind of the irregularities in structures, with considerable effect on seismic performance, is setback in elevation that causes large damage especially in the vicinity of the irregularity. The main objective of this research is to propose and develop drift based index to estimate damage to Reinforced Concrete Moment Resisting Frames (RCMRFs) with setback. For this purpose, first, inelastic dynamic time-history analysis is performed on several frames with different types of setbacks subjected to various earthquake records and damage to them is computed by the Park-Ang damage index. Then two relations between the damage and drift are derived by applying irregularity indices to account for setback effects. It is shown that the proposed damage indices are capable to estimate the damage index of setback frames.

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