边坡场地条件下粘弹性人工边界模型的地震输入模式研究  

Study on the seismic input mode of viscoelastic artificial boundary under the condition of slope site

作　　者：蒋新新[1,2] 李建波[1,2] 林皋[2] 

机构地区：[1]水能资源利用关键技术湖南省重点实验室,湖南长沙410014 [2]大连理工大学工程抗震研究所,辽宁大连116024

出　　处：《世界地震工程》2013年第4期126-132,共7页World Earthquake Engineering

基　　金：国家自然科学基金重点项目(51138001);水能资源利用关键技术湖南省重点实验室开放基金(PKLHD201303)

摘　　要：粘弹性人工边界模型在水利工程与核电站抗震分析领域应用广泛,但当该方法应用于边坡场地条件下的土-结构相互作用分析时,往往会出现地基区域外边界地震输入荷载的不一致等问题,可能导致结构响应发散或位移漂移,对计算结果的合理性产生影响。从动力相互作用原理出发,关注粘弹性人工边界模型的地震动输入机制,构建了基于虚拟的对称子结构体系的地震输入模式。该地震输入模式不但满足了地基区域外边界地震整体荷载一致,而且可有效模拟地基内地震波的传播。最后以边坡场地的动力响应数值分析为例,验证了所提方法的精度与数值稳定性。The viscoelastic artificial boundary model is widely used to the field of earthquake resistance analysis of water conservancy project and nuclear power station.However,for the analysis of soil-structure dynamic interaction on the sloping site,some problems will be caused while using that method.The large size difference of side facades on the outer boundary will cause inconsistent horizontal seismic force,which may lead to the divergent results or the drift of displacement.In this paper,based on the basic formula of dynamic interaction and seismic input mechanism,a virtual symmetrical sub-structure system is built to solve those problems,which not only satisfies the consistence of whole seismic input on outer boundary but also simulates the seismic wave propagation validly.Finally,the accuracy and the stability of the new method are verified through numerical example on the sloping site.

关 键 词：边坡场地 结构-地基相互作用 粘弹性边界 对称子结构 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]