黏弹性人工边界的地震波参考波场选取方法比较分析  

Comparative analysis of seismic reference wave field selection methods based on viscoelastic artificial boundary

作　　者：宋贞霞 蒋永攀 丁海平[1] SONG Zhenxia;JIANG Yongpan;DING Haiping(Key Laboratory of Structural Engineering of Jiangsu Province,Suzhou University of Science and Technology,Suzhou 215011,China)

机构地区：[1]苏州科技大学江苏省结构工程重点实验室,江苏苏州215011

出　　处：《地震工程与工程振动》2024年第2期183-193,共11页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51808371)。

摘　　要：土-结构动力相互作用分析需要引入人工边界对无限域进行模拟,黏弹性人工边界是目前常用人工边界之一。在使用人工边界时,作为地震波动输入的地震波参考波场选取很关键,不同参考波场选取方法的计算精度有很大差异。假定均匀半空间、成层场地、凹陷地形和含地下结构等4种二维场地模型,采用ANSYS有限元软件结合黏弹性人工边界计算工具,考虑SV波垂直入射和30°倾斜入射2种情形,分别对采用3种不同参考波场输入的计算精度进行了详细比较,结果表明:当土-结构动力相互作用计算模型的所有人工边界均选用自由场作为参考波场时,计算结果精度最高。Artificial boundaries are introduced to simulate the infinite domain in the analysis of soil-structure dynamic interaction,and the viscoelastic artificial boundary is one of the commonly used artificial boundaries.When the artificial boundary is used,the selection of the reference wave field as the input of seismic wave is very important,different reference wave field selection methods will lead to great differences in calculation accuracy.In this paper,four kinds of two-dimensional site models,including homogeneous half space,layered site,depressed terrain and underground structure are assumed.Then ANSYS finite element software and viscoelastic artificial boundary are used to simulate the above four site models considering SV wave vertical incidence and 30° oblique incidence.The calculation accuracy of three different reference wave fields is compared in detail.The results show that when the free wave field is selected as the reference wave field for all artificial boundaries of the soil-structure dynamic interaction calculation model,the accuracy of the calculation results is the highest.

关 键 词：土-结构动力相互作用 黏弹性人工边界 参考波场 二维场地 ANSYS 

分 类 号：TU435[建筑科学—岩土工程]