TY - JOUR

T1 - Cumulative Component Damages on Collapse Capacity of Ductile Steel and CFT Moment Resisting Frames under Over-design Ground Motions

AU - Bai, Y.

AU - Ma, X.

AU - Wang, B.

AU - Cao, G.

AU - Beer, M.

N1 - Funding Information: This study was financially supported by the National Natural Science Foundation of China (51708037 and 51978076), Start-up Foundation of Chongqing University (T0180), and fundamental research funds for the central universities (2020CDJQY-A063 and 2018CDXYTM0003). In particular, the first author is awarded a Humboldt research fellowship sponsored by the Alexander von Humboldt Stiftung/Foundation (1196752), at the Institute for Risk and Reliability (Chair: Prof Michael Beer) in the Leibniz University of Hannover, Germany.

PY - 2020/8/12

Y1 - 2020/8/12

N2 - Great earthquakes are likely to generate ground motions larger than those considered in design codes (over-design ground motions) and hence leading to a seismic demand that causes severe damages of structural components in general high-rise steel moment-resisting frames (SMRFs). Overall seismic behavior of high-rise SMRFs may be significantly affected by the local failure of members. This paper focuses on the margins of deterioration and collapse of 40-story SMRFs and the equivalent MRFs with concrete-filled tubular (CFT) columns considering the strength deterioration effect in constitutive models designed by current building standards. The input long-period ground motions are synthetic earthquake waves with flat velocity spectral shape. Deterioration and collapse criteria of models based on the peak ground motion velocity are estimated by performing the incremental dynamic analysis (IDA). The results indicate that the collapse mechanism was formed in the lower stories of high-rise SMRFs under the very rare earthquake. The strength and stiffness deterioration significantly amplified the damage extent and the influence degree depends on the sectional compactness of components. And the MRF with concrete-filled tubular (CFT) columns has a higher collapse margin against overall collapse compared with SMRFs.

AB - Great earthquakes are likely to generate ground motions larger than those considered in design codes (over-design ground motions) and hence leading to a seismic demand that causes severe damages of structural components in general high-rise steel moment-resisting frames (SMRFs). Overall seismic behavior of high-rise SMRFs may be significantly affected by the local failure of members. This paper focuses on the margins of deterioration and collapse of 40-story SMRFs and the equivalent MRFs with concrete-filled tubular (CFT) columns considering the strength deterioration effect in constitutive models designed by current building standards. The input long-period ground motions are synthetic earthquake waves with flat velocity spectral shape. Deterioration and collapse criteria of models based on the peak ground motion velocity are estimated by performing the incremental dynamic analysis (IDA). The results indicate that the collapse mechanism was formed in the lower stories of high-rise SMRFs under the very rare earthquake. The strength and stiffness deterioration significantly amplified the damage extent and the influence degree depends on the sectional compactness of components. And the MRF with concrete-filled tubular (CFT) columns has a higher collapse margin against overall collapse compared with SMRFs.

KW - collapse prevention

KW - cumulative plastic deformation ratio

KW - high-rise buildings

KW - member deterioration

KW - Seismic damage

UR - http://www.scopus.com/inward/record.url?scp=85089454111&partnerID=8YFLogxK

U2 - 10.1080/13632469.2020.1784315

DO - 10.1080/13632469.2020.1784315

M3 - Article

AN - SCOPUS:85089454111

VL - 26

SP - 3012

EP - 3033

JO - Journal of Earthquake Engineering

JF - Journal of Earthquake Engineering

SN - 1363-2469

IS - 6

ER -