Seismic Performance of Buckling-Restrained Braces in Irregular Reinforced Concrete Buildings under Successive Earthquakes

Document Type : Research Article

Authors

1 Qualitative and Quantitative Analysis of Fluids and Environmental Research Group, Department of Civil Engineering, Tafresh University, Tafresh 39518-79611, Iran

2 Qualitative and Quantitative Analysis of Fluids and Environmental Research Group, Department of Civil Engineering/ Tafresh University/ Tafresh/ Ian.

10.22060/ceej.2026.23788.8216

Abstract

This study evaluates the seismic performance of irregular reinforced concrete (RC) structures equipped with buckling-restrained braces (BRBs) under successive earthquakes involved foreshock-mainshock and mainshock-aftershock. Seismic sequence phenomenon refers to the occurrence of multiple shocks in a short time interval, whose cumulative effects can significantly change the structural response compared to a single shock. In this regards, three RC frames with 3, 6, and 9 stories were designed based on the Iranian Code 2800. Nonlinear dynamic analyses were conducted in OpenSees after verification of the studied frames based on reference model. Comparison of the response of frames under single and successive shocks indicate that BRBs improve lateral force distribution, increased ductility in the upper stories (up to 32%), and reduced beam and column cross-section dimensions. Also, residual displacements and inelastic strains have been increased about 47% in frames with fewer BRBs. Moreover, increased damage has been observed up to two times. Generally, the results indicate that buckling braces are a reliable option for improving the seismic performance of irregular reinforced concrete structures under successive earthquakes due to providing high energy absorption capacity and stable hysteresis behavior.

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Amirkabir Journal of Civil Engineering
Volume 57, Issue 9
in progress
December 2025

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