周期分布结构-地基系统在竖向传播地震作用下的透射边界模型  

Transmitting boundary model for periodically spaced structure-foundation systems subject to upgoing seismic waves

作　　者：沈冯强[1] 

机构地区：[1]合肥工业大学土木建筑工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2000年第2期173-176,181,共5页Journal of Hefei University of Technology：Natural Science

基　　金：留学回国人员科研启动基金

摘　　要：结构-地基有限模型中传统的固定（或自由）边界错误地将地震能量全都陷入结构的计算模型，严重影响了结构地震反应的计算精度．为了改善这一不合理状况，该文提出周期分布结构-地基系统在竖向传播地震作用下的透射边界模型，用于处理结构-地基的动力相互作用。在地基有限模型的底面使用阻尼或改进的阻尼透射边界，侧边使用捆绑边界。文中算例表明该透射边界模型不仅有效，而且还能应用于一般结构-地基系统的非线性动力反应分析。In the traditional model of structure-foundation systems, earthquake energy is incorrectly trapped inside the computational model due to simply fixed/free condition at artificially truncated boundaries of the foundation, which contaminates significantly the numerical results of structural dynamic analyses. To overcome this drawback of the classical fixed/free boundary of finite computational models for structure-foundation systems, a transmitting boundary model has been proposed to account the dynamic interaction between structures and foundations for dynamic analyses of periodically spaced structure-foundation systems subject to upgoing seismic waves. In the transmitting boundary model, the standard or modified viscous dampers are imposed at the bottom boundary while the lateral boundaries are tied together. The success of the transmitting boundary model is shown through a numerical example. The transmitting boundary model can also be applied for non-linear dynamic analyses of general structure-foundation systems.

关 键 词：透射边界模型 地震反应 周期分布 结构-地基系统 

分 类 号：TU311.3[建筑科学—结构工程]