地震作用下埋地管道横向振动分析

Transverse vibration analysis of buried pipeline under earthquake interaction

将埋地管道的横向振动偏微分方程和轴向振动偏微分方程转化为动力学方程的基本形式,将地震激励按照随机波和简谐波分别输入到运动方程中。利用弹性时程分析法,对管道单元进行动力时程分析并编制程序,得到管道中点的位移响应和加速度响应。考虑了土参数、管道参数、地震动参数、支承距离等因素对管道响应的影响,得到土的特性对管道的位移响应和加速度响应有一定的影响,随着土质由软变硬,管道的位移响应越小。

The differential equations of transverse vibration and axial vibration were translated into basic form of dynamics equations,considering earthquake excitation as random wave and harmonic wave in the dynamic equations.Utilizing the method of the elasticity time-travel analysis to program,the response of the displacement and acceleration at the midpoint were obtained,moreover the pipe element was analyzed.The soil parameter,pipe parameter,earthquake dynamic parameter and the supporting distance were considered as the influence of pipe response.The characteristic of the soil had an influence on response of velocity and acceleration.Along with soil from soft to hard,the response of velocity became smaller.In the same soil,the earthquake damage rate of the piping became increaser along with earthquake intensity increasing.