Comparison of the seismic performance of reinforced concrete shear wall structures under near-fault and far -fault excitations

Koochak  Dezfuly, Ali; Hassani, Nemat; Ghasemi, Abbas

doi:10.22065/jsce.2024.442893.3360

Comparison of the seismic performance of reinforced concrete shear wall structures under near-fault and far -fault excitations

Document Type : Original Article

Authors

Ali Koochak Dezfuly ¹

Nemat Hassani ²

Abbas Ghasemi ³

¹ PhD Student/Faculty of Civil and Earth Resources Engineering/ Islamic Azad University Central Tehran Branch/ Tehran/ Iran

² associated professor/,Faculty of Civil, Water and Enviromental Engineering,/Shahid Beheshti University/Tehran,/ Iran.

³ Assistant Professor/ Faculty of Civil and Earth Resources Engineering/ Islamic Azad University Central Tehran Branch/Tehran/Iran

10.22065/jsce.2024.442893.3360

Abstract

In the present study, the performance of the irregular concrete building before and after retrofitting under the effect of seismic movements in the far and near fault areas has been evaluated. In order to achieve this goal, in the current research, modeling and increasing nonlinear dynamic analysis, development of fragility model and development of vulnerability curve have been done. The IDA curves was done based on two sets of records including movements away from the fault and near the fault, and fragility curves were developed. By examining the fragility curve graphs, two general patterns can be clearly distinguished. As a result of applying the retrofitting strategy, which leads to a tangible reduction of the possibility of exceeding the functional levels, the transition of the fragility curve is evident. It is worth noting that this change is more noticeable at the level of the collapse threshold and its intensity decreases as we move towards the level of non-stop use. Under the movements of the near field, the values of the probability of exceeding the functional levels will increase so that this change in the functional level of the collapse threshold is more significant and its intensity decreases by moving towards the non-stop use level. Also, the inherent weakness of the structure in the transverse direction reduces the impact intensity in both of mentioned patterns. For example, in the 4g intensity scale, the amount of damage in the transverse and longitudinal directions has decreased by 3 and 2 times, respectively, under normal records. This ratio is 3 times and 1.5 times in the horizontal and longitudinal direction under the effect of near-fault records. As it is known, the effect of retrofitting as well as near-fault records is completely evident in the vulnerability curve.

Keywords

Dynamic analyses

Strengthening

Fragility curve

Vulnerability curve

ear-field

far-field

Subjects

Repair, Rehabilitation and Retrofit of Structures

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