Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (3): 876-885.doi: 10.13278/j.cnki.jjuese.201503202

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Quantitative Analysis of Dynamic Shear Modulus Ratio's Effect on Response Spectra

Jiang Qifeng, Rong Mianshui, Peng Yanju   

  1. The Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China
  • Received:2014-09-05 Published:2015-05-26

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Abstract:

The uncertainty of dynamic shear modulus ratio has a large impact on the site seismic response analysis results. Most studies on the influence are qualitative at present. The authors try to quantitatively study the influence on the engeering sites in Bohai Sea. Firstly, The authors builted the site seismic response calculation models;secondly, by adding a series of deviations to the original dynamic shear modulus ratio with maintaining other parameters unchanged, the anthors calculated the change of response spectra, and then got the sensitivity values of response spectra on the dynamic shear modulus ratio. According to the research, the conclusion is drown as below: 1)With the dynamic shear modulus ratio curves going up and down, a turning point appears near the characteristic period of the datum response spectrum; 2)Under probability level 2 and 3, the platform segments of the response spectra show the highest sensitivity values which are basically between 1.0 and 3.0. The absolute sensitivity values on the decending segment are mostly larger than 1.0, and increase quickly at first; and then decrease slowly to zero with the increase of period; but relatively stable between 1.0 to 2.0 on the ascending egment with the increase of period.

Key words: sensitivity analysis, dynamic shear modulus ratio, uncertainty, response spectrum, Bohai Sea

CLC Number: 

  • P315.9

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