Seismic response analysis of frame structure with liquefiable interlayer site based on probability density evolution method

Abstract

Abstract: Based on FLAC3D finite difference software, a numerical model for coupling analysis of foundation and frame structure is established to analyse the influence of different buried depths and thickness of liquefied interlayer on the seismic response of frame structure, and to study the variation law of inter-story displacement angle and settlement of structure. On this basis, the random seismic response of the structure is further studied by probability density evolution theory. The results show that the maximum inter-story displacement angle and the overall settlement of the building decrease with the increase of the buried depth of the liquefied interlayer, and the location of the most dangerous floor moves downward with the increase of the buried depth of the liquefied interlayer. Moreover, with the increase of the thickness of the liquefied interlayer, the maximum inter-story displacement angle and the overall settlement of the building increase. Based on the deterministic calculation results, the seismic reliability of the structure is 0.492, which indicates that it is necessary to consider the random characteristics of the ground motion in the seismic analysis of the structure.

Key words: liquefaction interlayer, frame structure, probability density evolution, reliability

CLC Number:

TU44

YANG Jia-zhi, LI Rui, WANG Jun-cheng. Seismic response analysis of frame structure with liquefiable interlayer site based on probability density evolution method[J]. Journal of Lanzhou University of Technology, 2025, 51(6): 145-151.

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