强震状态下黄土中桩基动力性状分析  

Dynamic Performance of Pile Foundation in Loess During Strong Earthquakes

作　　者：张斌伟 严松宏[2] ZHANG Binwei, YAN Songhong(1. School of Civil Engineering, Longdong University, Qingyang 745000, Gansu, China; 2. School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China)

机构地区：[1]陇东学院土木工程学院,甘肃庆阳74500 [2]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《地震工程学报》2018年第3期473-479,489,共8页China Earthquake Engineering Journal

基　　金：2015年甘肃省自然科学基金;甘肃省高等学校科研基金"陇东深厚黄土地基桩-土作用理论分析及试验研究"(1506RJZM322;2015A-151)

摘　　要：传统通过p-y曲线法分析强震状态下黄土中桩基动力性状时未进行桩基结构模拟,获取的强震状态下黄土中桩基动力的相关动力参数不准确。本文提出新的强震状态下黄土中桩基动力性状分析方法,依据HS硬化模型设计HSS本构模型,通过模型获取强震状态下黄土中桩基动力的相关参数,以此为基础采用PLAXIS软件构建黄土中桩基有限元模型;通过两种模型从耦合荷载作用下的桩基桩身水平位移响应、桩身内力响应两方面对强震状态下黄土桩基动力性状展开实验分析。实验结果表明,所提方法可对强震状态下黄土中桩基动力性状进行准确分析。The traditional p-ycurve method for analyzing the dynamic behavior of pile foundations in loess during strong earthquakes does not simulate the pile foundation structure,so the relevant dynamic parameters of the pile foundation in loess are inaccurate.In this paper,we present a new dynamic analysis method for pile foundations in loess during strong earthquakes.We designed a hardening soil-small（HSS）constitutive model based on the hardening soil（HS）model,and obtained the related parameters of the pile foundation in loess during strong earthquakes through the constitutive model.Then,using PLAXIS software,we constructed a finite element model of the pile foundation in loess.Based on these two models,we conducted experiments on pile foundations during strong earthquakes to analyze their horizontal displacement responses and the internal forces in the pile body under the coupled load.The experimental results show that the pro-posed method can accurately analyze the dynamic characteristics of pile foundations in loess during strong earthquakes.

关 键 词：强震状态 黄土中桩基 HSS本构模型 有限元模型 相关参数 动力性状竖向荷载 水平载荷 

分 类 号：TU133[建筑科学—建筑理论] U443.15[建筑科学—桥梁与隧道工程]