Seismic vulnerability analysis of hydropower house superstructure based on material damage

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (1) : 264-270.

SHI Changzheng, WU Hegao, GAO Xiaofeng, SU Kai

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Abstract

Reinforced concrete (RC) frame-shear wall structureas superstructure of a hydropower house is easy to be damaged under earthquake. Here, a method to evaluate aseismic performance of hydropower house superstructure based on material damage was proposed. The seismic vulnerability of powerhouse superstructure was analyzed using finite element analysis and incremental dynamic analysis. Results showed that the main seismic damage of hydropower house superstructure is cracking of its wall column and spalling of concrete protective layer, compressive damage of concrete in core area is smaller, the powerhouse superstructure has a high aseismic safety reserve and the probability of its serious damage or even collapse is very small; it is easy to judge states of cracking and crushing of components with material damage, and then judge damage degree of components; when the structure is not damaged or damaged very little, the difference of structural vulnerabilities obtained by using interlayer displacement angle or based on material damage judgment is smaller, and when the damage degree is larger, the interlayer displacement angle is easy to deviate; using material damage to judge damage state of the structure is feasible, compared to interlayer displacement angle, it is more direct and more applicable.

Key words

hydropower house / frame-shear wall structure / seismic vulnerability / material damage / incremental dynamic analysis

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SHI Changzheng, WU Hegao, GAO Xiaofeng, SU Kai. Seismic vulnerability analysis of hydropower house superstructure based on material damage[J]. Journal of Vibration and Shock, 2021, 40(1): 264-270

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