基于Opensees的桩土动力p-y曲线模型研究  

Study on p-y curve model of dynamic pile-soil interaction based on Opensees

作　　者：李雨润[1,2] 史精 梁艳[3] 张浩亮[4] 

机构地区：[1]河北工业大学土木工程学院,天津300401 [2]河北省土木工程技术研究中心,天津300401 [3]河北工业大学城市学院土木工程系,天津300130 [4]铁道第三勘察设计院集团有限公司城交分院,天津300251

出　　处：《人民长江》2015年第23期82-86,共5页Yangtze River

基　　金：中国博士后科学基金资助项目(2014M561169);河北省自然科学基金资助项目(E2013202118);河北省城乡和住房建设厅项目(2014-231)

摘　　要：桩土动力p-y曲线法在岩土工程中已得到广泛应用。通过Opensees软件中内嵌的Pysimple1材料模型,利用p-y单元建立了土-单桩-承台相互作用简化模型。分析在砂土和黏土p-y单元中的桩身和桩头承台动力响应特点,同时对不同自由场土体长度下桩身和桩头承台动力响应进行了分析。结果表明,砂土p-y单元的桩头承台加速度峰值大于黏土单元,位移峰值小于黏土单元,桩身的剪力、弯矩都比黏土要大。自由场土体长度越短,承台的位移和加速度就越大,当自由场土体长度达到300 m时基本满足计算精度要求。The p- y curve method of pile- soil dynamic interaction is widely used in geotechnical engineering. A simplified analysis model of soil- single pile- cap interaction is set up by using p- y element through the embedded Pysimple1 material model of the Opensees software. The dynamic response characteristics of pile and pile cap in p- y element of sandy soil and clay soil were researched and the dynamic response of pile body and pile cap under different length of free field were analyzed. The results show that the peak acceleration of pile cap in the p- y element of sand soil is larger than that of the clay element,while the peak displacement is less than the clay element. The pile shearing force,bending moment and acceleration in the p- y element of sand soil are stronger than those of the clay element. The shorter the free field length is,the greater the displacement and acceleration of pile caps are. The requirement of calculation accuracy would be satisfied when the free field length reaches 300 m.

关 键 词：Opensees软件 桩-土动力相互作用 简化计算方法 p-y单元 自由场 

分 类 号：P642[天文地球—工程地质学]