土桩结构非线性相互作用体系行波效应的并行计算分析

Parallel Computing Analysis of the Traveling Wave Effect of Soil-pile-structure Nonlinear Interaction System

采用并行计算方法,分别选取长周期地震波和普通地震波作为输入,以某典型桥梁工程为背景建立土桩桥梁结构非线性相互作用分析模型,对在不同类型地震波作用下的土桩结构非线性相互作用体系进行了行波效应分析,探讨了桩土接触效应和并行计算加速比等问题.分析结果表明:接触面效应对群桩水平向地震反应的影响较小,在竖直向则会产生明显的不协调现象.考虑接触面效应时,行波输入下的结构水平向加速度反应略小于一致输入,竖向加速度反应则远大于一致输入,水平向和竖向的位移反应也较大.长周期地震动行波输入下的水平向加速度和位移反应结果均大于普通地震波.对于此类大计算量三维有限元分析,采用并行计算方法可以有效提高计算效率.

For Buguzi River Bridge on Wulumuqi-Kash Railway, a three dimensional soil-pile-structure nonlinear interaction system model was built. Long-period and normal seismic waves were selected for three dimensional seismic response parallel computation of soil-pile-structure nonlinear interaction system, and the interface effect of pile-soil and speedup ratio of parallel computation were discussed. The results have shown that the interface effect of pile-soil leads to considerable vertical in-coordination. When consid- ering the interface effect of pile-soil, the horizontal acceleration response of piles is decreased little and the vertical acceleration response of piles is increased greatly when compared with uniform excitation. Mean- while, the horizontal and vertical displacement responses of pilesare increased. The horizontal acceleration responses of lateral pile caps are smaller than that of medial pile caps, and that of vertical acceleration re- sponses are opposite. Parallel computing was also performed to raise computational efficiency.