粘弹性人工边界在地下结构抗震分析中的应用

地下结构地震反应分析需考虑结构-地基的动力相互作用,其中场地土层的自由场反应分析是确定地震输入的关键问题。以往地下工程实例表明,在结构动力时程计算中,能否有效模拟无限地基边界对结构抗震分析有很大的影响。基于某地下综合体项目进行抗震评估,采用黏弹性人工边界模拟自由场震动响应,克服工程中传统分析里不能模拟场地无限域的缺点。为地下结构的动力时程分析提供可靠数值依据。

Application of Viscoelastic Artificial Boundary in Seismic Analysis of Underground Structures

The seismic response analysis of underground structure is required to consider the dynamic interaction between the structure and foundation, in which the free field response analysis of the layered soil is the key to determine the seismic input. The previous underground engineering examples show that whether or not to effectively simulate the infinite foundation boundary has the great influence on the seismic analysis of structure. Based on the seismic evaluation of an underground complex project, the viscoelastic artificial boundary is used to simulate the seismic response of free filed, which overcomes the disadvantage that the traditional analysis can not simulate the infinite field of the site in the project, and provides the reliable numerical basis for the dynamic time history analysis of underground structures.