场地局部效应对地下管线的影响  

Impact of locality effect on underground pipelines

作　　者：王岱[1] 屈铁军[2] 梁建文[1] 

机构地区：[1]天津大学土木工程系,天津300072 [2]北方工业大学土木工程系,北京100041

出　　处：《地震工程与工程振动》2010年第5期106-112,共7页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金资助项目(50678001);北京市教育委员会科技发展计划重点项目(kz200710009005)

摘　　要：将实际地震动看作非平稳随机过程,地震动不仅具有时域非平稳性,而且具有频域非平稳性。SMART-1台阵地震记录分析结果已证实,地震时地面上各点在同一时刻的地震动时变自功率谱存在一定的差异。时变自功率谱的差异对地下连续管线的影响还不十分清楚。利用随机振动理论中的虚拟激励法计算了均匀介质中地下连续管线纵向和横向的地震响应,给出了场地局部效应对均匀介质中地下连续管线的影响。分析结果表明,场地局部效应对均匀介质中地下连续管线地震反应的影响很小。因此,实际计算时可忽略场地局部效应。As stochastic process,seismic ground motions are considered non-stationary not only in time domain,but also in frequency domain.The analysis of data recorded at SMART-1 array has confirmed that there are some differences among the time-varying auto-spectral densities of seismic ground motions at different stations at the same time.The effect of the differences on the underground continuous pipelines in uniform medium is not very clear.In this paper,the seismic responses of the underground continuous pipelines in both longitudinal and lateral directions in uniform medium are studied by the pseudo-excitation method in random vibration theory,and then the impact of the locality effect on the underground continuous pipeline is analyzed.The results show that the locality effect has little impact on the seismic responses of the underground continuous pipelines in uniform medium.It is suggested that the locality effect can be neglected in practice.

关 键 词：地下管线 地震作用 虚拟激励法 局部效应 

分 类 号：O324[理学—一般力学与力学基础] TB123[理学—力学]