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| Selection of ground motion intensity measures in the seismic analysis of hydropower houses |
| SONG Zhiqiang1，ZHANG Jianfeng1,2，WANG Fei1，YAO Qianru1 |
1. Institute of Water Resources and Hydro-Electric Engineering, Xi’an University of Technology, Xi’an 710048, China;
2. China Three Gorges Projects Development Co., Ltd., Chengdu 610094, China |
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Abstract In order to explore the applicability of ground motion intensity measures used for the seismic analysis of hydropower house, an actual ground hydropower house is taken for an example. 42 natural earthquake records are firstly selected as inputs for the correlation analysis between 17 representative intensity measures and the non-linear seismic response of hydropower house to evaluate the suitability of intensity measures in seismic response analysis. Then, based on the results of incremental dynamic analysis, linear regression analysis between IMs with high correlation and EDP is carried out in logarithmic coordinate system to evaluate the rationality of intensity measures in probabilistic seismic demand analysis in terms of efficiency, practicality and proficiency, so as to obtain an accurate conclusion of seismic fragility analysis. The results show that, in general, velocity-type intensity measures have a higher correlation with the seismic response of hydropower house than acceleration-type intensity measures and displacement-type intensity measures, in addition, the velocity-type intensity measures related to spectrum characteristics should be preferentially chosen for seismic response analysis. According to the logarithmic linear regression analysis of incremental dynamic analysis（IDA） results, it is found that velocity-type intensity measures are more reasonable to be used as IM in PSDA. VSI is the best considering efficiency, practicality and proficiency, and can be applied to seismic fragility analysis to evaluate the seismic performance of hydropower house accurately.
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Received: 10 September 2020
Published: 28 January 2022
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