摘要
本文以高承台群桩基础振动台试验为依据,基于有限元计算程序ABAQUS建立数值计算模型,该模型可以较好地模拟试验获得的加速度响应时程、动力放大效应与桩身内力。计算结果显示:与低承台相比,高承台的加速度动力放大效应更加明显,其桩身弯矩包络值最大截面位于地表以下1. 6倍桩身直径,反映出桩身外露会显著影响桩身的内力分布;群桩中各排桩的应力水平也不尽相同,沿激振方向最前排桩的桩身应力水平较高,后排桩次之,中间桩最小。
Based on the shaking table test of pile group foundation with high cap,a numerical model is established based on the finite element program ABAQUS. The model can simulate the acceleration response time history,dynamic amplification effect and internal force of pile body. The results show that: the dynamic magnification effect of acceleration of high cap is more obvious than that of low cap,and the maximum section of the envelope value of pile bending moment is 1. 6 times diameter of pile below the surface,reflecting that the exposure of pile body will significantly affect the internal force distribution of pile body;the stress levels of each row of piles in pile group are also different,the stress level of the front row of piles is higher along the direction of excitation,the number of piles in the back row is higher,and the middle pile is the smallest.
作者
赵晓光
高文生
倪克闯
万征
Zhao Xiaoguang;Gao Wensheng;Ni Kechuang;Wan Zheng(Foundation Institute,China Academy of Building Research,Beijing 100013,China;State Key Laboratory of Building Safety and Built Environment,Beijing 100013,China;Beijing Engineering Technology Research Center of Foundation and City Underground Space Development and Utilization,Beijing 100013,China)
出处
《建筑科学》
CSCD
北大核心
2020年第1期83-90,共8页
Building Science
基金
中国建筑科学研究院自筹基金课题,高承台桩基础的抗震性能研究(20161602330710022).
关键词
高承台
群桩基础
有限元
动力计算
high cap
pile group foundation
finite element
dynamic calculation
