摘要
地下综合管廊是一种重要的生命线基础设施,目前对其抗震性能的研究还处于起步阶段。由于属于浅埋地下结构,故地震波中的面波、尤其是Rayleigh波可能会成为地下综合管廊破坏的控制因素。本文根据简谐Rayleigh波的特点,提出了近似Rayleigh地震波的概念,并在假定已知Rayleigh波水平分量的情况下,利用傅里叶变换求得近似Rayleigh地震波场。采用三维有限元模型,对地下管廊结构进行了地震响应分析。分析结果表明:本文建议方法可以有效地模拟波动的传播过程;地下综合管廊结构的变形以整体弯曲变形为主;结构顶面应变约为对应底面位置应变的两倍,与Rayleigh波沿深度衰减的规律相类似。
The utility tunnel is one of the important lifelines.However,the research of its seismic performance is still at the initial stage.Usually,the utility tunnel is shallowlly buried,so the surface waves,especially the Rayleigh ones,would be the control factor to its failure.This paper puts forward the concept of earthquake of approximate Rayleigh waves.And at the same time,the Rayleigh wave field is obtained with the Fourier＇s technique under the assumption that the time history of horizontal component of earthquake is known.A 3-D finite element model is set up with the software ABAQUS to study the seismic response of the utility tunnel.From the calculated results,the wave propagation can be seen clearly and the structural deformation is dominated mainly by the bending deformation;the strain at the top point is about 2 times as large as that at the bottom point,which is similar to the character of the Rayleigh waves.
出处
《防灾减灾工程学报》
CSCD
2008年第4期409-416,共8页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家自然科学基金委创新研究群体项目(50621062)资助
关键词
地下综合管廊
近似Rayleigh地震波
傅里叶变换
动力响应
utility tunnel
earthquake of approximate Rayleigh waves
Fast Fourier＇s Transformation（FFT）
dynamic response
