Abstract
Liquefaction is one of the main causes of pile foundation failure under earthquake loading. To solve this problem, seismic responses of pile foundation are typically analyzed by centrifugal shaking table test and numerical model. In this paper, a 3-D numerical model is established based on the open-source finite element platform (OpenSees). The PDMY02 multi-yield plastic model is adopted to simulate the dynamic behavior of saturated sand, with soil simulated by u-p fluid-solid coupling element and pile by beam-column elastic element respectively. Based on the data of centrifuge test of single pile, the validity of the numerical model is verified; and the influences of the upper structure mass, pile head fixation and ground inclination on the seismic response of single pile are analyzed. The results show that soil liquefaction can increase the lateral displacement and bending moment of single pile; the mass block at pile cap can magnify the pile inertial force and increase the pile-soil interaction, resulting in the augment of lateral displacement and bending moment; pile head fixation can effectively reduce lateral displacement, but intensify bending moment; sloping ground has a key influence on the pile dynamic response, and greater inclination leads to larger lateral displacement and bending moment of single pile.
Published Version
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