Levels of Probability of Exceedance for Current Code Spectra in China |
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| Authors: | Shen Jianwen Liu Zheng and Shi Shuzhong |
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| Institution: | [1]Earthquake Administration of Shanghai Municipality, Shanghai 200062, China [2]Tongji University, Shanghai 200092, China [3]Earthquake Administration of Zhejiang Province, Hangzhou 310013, China |
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| Abstract: | Long-period acceleration spectra determined by seismic safety evaluation for project sites are generally lower than that given by relative code spectra. In this paper, we discuss the recurrence periods corresponding to the code spectra of different periods, by using ground motion attenuation laws for sites of types Ⅰ and Ⅲ. We show the results that the longer the periods of code spectra are commonly the more conservative the seismic level is. As for the project examples in this paper, when the periods are longer than 3.7 or 5.2 seconds for sites of types Ⅰ or Ⅲ, the recurrence periods corresponding to the code spectra are longer than 5000 years. We suggest that some problems need to be further discussed, including the reliability of the present attenuation laws, the performance of those project structures that suffer long period seismic waves and have been designed according to the conservative codes, and the effects of ground motion parameters such as velocity and displacement on seismic design. |
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| Keywords: | Seismic design Code spectra Probability level of exceedance |
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