摘要
为了研究考虑地震动的空间相关性时埋地管线的地震响应,基于Opensees有限元程序,对埋地管线在多维多点相关地震动作用下的响应进行数值模拟。模型中采用基于柔度法的非线性梁柱单元模拟管体结构,利用基于频域合成法生成多维多点人工地震动实现地震激励输入,采用零长度单元考虑管体和土体在其接触面上的非线性力学行为。数值模拟结果表明:0.2 g地震强度下,非一致激励下管道的应变响应主频是一致激励下管道应变响应主频的4~5倍;在0.1 g地震强度下,非一致激励得到的管体应变最大可以达到一致激励下管体应变的1.5倍,且随着地震强度增强两者的差距明显增大,这种差距可能使在一致激励下安全的埋地管线在考虑非一致激励时变得不安全。所以在抗震设防等级较高的地区,考虑非一致地震激励作用对于埋地管线的破坏是必要的。
In order to study the seismic response of buried pipelines when the spatial variation of ground motions is considered,based on finite element procedure Opensees,numerical simulation on the response of buried pipelines under the multi-dimensional and multi-point earthquake excitation are carried out in this paper. In the model,A flexibility method based nonlinear beam-column elements is used to represent pipeline,the input non-uniform excitation are generated based on multi-dimensional multi-point frequency synthesis; and the zero Length element is adopted to consider the nonlinear mechanical behavior of the soil-pipeline contact surface. The numerical simulation results show that when earthquake intensity is 0. 2g,the main frequency of pipeline strain under uniform excitation is four to five times larger than that under non-uniform excitation. When the earthquake intensity is 0. 1g,the response of the pipeline strain is almostly 1. 5 times of that under non-uniform excitation; but once the earthquake intensity grows greater,there is an obviously difference between non-uniform and uniform excitation,this gap is likely to make the safe buried pipeline under consistent excitation becomes unsafe,when the non-uniform excitation isconsidered so in high seismic fortification area,considering the non-uniform seismic excitation for buried pipeline is necessary.
出处
《地震工程与工程振动》
CSCD
北大核心
2015年第6期150-159,共10页
Earthquake Engineering and Engineering Dynamics
基金
国家创新创业训练项目(201410613063)
国防基础科研计划(B0220133003)~~
关键词
埋地管线
多维多点地震动
非一致激励
OPENSEES
地震响应
buried pipeline
multi-dimensional and multi-point earthquake wave
non-uniform excitation
opensees
seismic response
