SIMPLIFIED ANALYSIS OF HORIZONTAL EARTHQUAKE ACTION ON THE STRUCTURES SUPPORTED BY PILES CONSIDERING EFFECTS OF NONLINEAR SOIL-STRUCTURE INTERACTION

摘要

Based on the preceding study of nonlinear soil-pile interaction and the results computed using ANSYS program, the simplified analysis procedure of the structure supported by piles, with the effects of nonlinear soil-structure interaction and under the horizontal earthquake action, is presented. The material nonlinearities, including nonlinear soil behavior and nonlinear structure behavior, and artificial boundary are applied in this procedure. Using this method, a ten-story frame building supported by piles is analyzed. Four cases are considered: 1) elastic analysis with an assumption of rigid ground, 2) inelastic analysis with an assumption of rigid ground, 3) elastic analysis with soil-structure dynamic interaction (SSI), 4) inelastic analysis with SSI. Some preliminary conclusions in these analyses are: 1) the super-structure is safer when SSI is not considered under the horizontal earthquake action, 2) the story drifts and absolute accelerations of super-structures decrease obviously under the horizontal earthquake action when SSI is considered, 3) the story drifts and absolute accelerations of super-structures in elastic analysis are larger slightly than in inelastic analysis, but the difference is small, 4) the soil responses near the piles may decrease when SSI is considered.