Efficient residual collapse capacity evaluation of mainshock-damaged RC frames under aftershocks: A back-to-back endurance time analysis method

Date

2025-10-15

Author

Yu, Xiaohui
He, Zihan
Ning, Chaolie
Cheng, Yin
Sucuoğlu, Haluk

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A back-to-back incremental dynamic analysis (B2BIDA) method is widely used to evaluate the residual capacity against collapse for a mainshock-damaged structure. It is usually computation-intensive since it requires performing IDA for both the intact and the damaged structure. To overcome this shortcoming, a back-to-back endurance time analysis (B2BETA) method is newly proposed, which consists of two times of ETA, i.e., mainshock ETA and aftershock ETA. For the mainshock ETA, the structure is subjected to a mainshock endurance time excitation function (ETEF), and several specific values of the ETEF's endurance time are identified from the mainshock ETA result in accordance with the concerned structural damage states. To perform the aftershock ETA, a sequence-type ETEF is first generated including a mainshock ETEF truncated at a specific endurance time for imposing a given level of initial structural damage and an aftershock ETEF that makes the mainshock-damaged structure experience increased damage until collapse. To illustrate the proposed method, two RC frames with four and eight stories are taken as the study cases. Both the B2BIDA and B2BETA methods are used to estimate the structural residual collapse capacity with varying levels of initial structural damage. It is found that the B2BETA method can evaluate the structural residual collapse capacity with sufficient accuracy and significantly reduced computational cost compared to the B2BIDA method. Finally, the proposed B2BETA method is further applied to generate the aftershock collapse fragility relationships for the mainshock-damaged structures.

Subject Keywords

Aftershock collapse fragility, Back-to-back IDA, Endurance time method, RC structure, Residual capacity

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https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=105008493554&origin=inward
https://hdl.handle.net/11511/115242

Collections

Department of Civil Engineering, Article