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多维多点相关地震动作用下埋地管线地震响应的数值模拟

DOI: 10.13197/j.eeev.2015.06.150.wuzj.021, PP. 150-159

Keywords: 埋地管线,多维多点地震动,非一致激励,Opensees,地震响应

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Abstract:

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0.2g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0.1g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。

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