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| Study on Response Spectra for Base-Isolated Structures Considering Focal Mechanism |
| DU Yong-feng1,2, HONG Na1, XU Tian-ni1, XIE Li1 |
1. Institute of Earthquake Protection and Disaster Mitigation, Lanzhou Univ. of Tech, Lanzhou 730050, China;
2. Western Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou Univ. of Tech, Lanzhou 730050, China |
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Abstract This paper studies the effect of focal mechanism on the response spectra of isolated structures, by simplifying the base-isolated structure as 2-DOF model. 605 records in the Ⅱsite condition are selected as statistical samples. The earthquake records are divided into different groups according to the type of earthquake and focal mechanism. The acceleration, displacement and input energy response spectra under near-field and far-field ground motions are solved by using state-space method. The features of the response spectra are studied by means of normalizing and averaging, and the expressions of design response spectra are established by using piecewise linear fitting method. It can reflect the influence of focal mechanism for spectra. Finally, the expression is verified by the seismic response of a real base-isolated structure. And the value is compared with that from the design code. The result shows that the formula proposed in this paper is more safe and reasonable, and can be used in the seismic design for base-isolated structures.
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Received: 27 October 2015
Published: 15 May 2017
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