ABAQUS中黏性边界条件的实现及应用  

Implementation and Application of Viscous Boundary Conditions in ABAQUS

作　　者：李煜东[1] 薄景山[1,2] 孙强强[1] 王亮[2] 乔峰[2] 

机构地区：[1]防灾科技学院,河北三河065201 [2]中国地震局工程力学研究所,黑龙江哈尔滨150080

出　　处：《防灾减灾工程学报》2017年第2期250-257,共8页Journal of Disaster Prevention and Mitigation Engineering

基　　金：中央高校基本科研业务费研究生科技创新基金项目(ZY20150302);中国地震局地震科技星火计划项目(XH15067Y);国家自然科学基金项目(51508096)资助

摘　　要：波动数值模拟时,基底直接输入地震波会导致波动能量在计算域内往复反射,影响分析结果的可靠性。应用黏性边界条件模拟无限地基的辐射阻尼效应,基于波动理论及Spring/Dashpots单元实现了ABAQUS软件中黏性边界条件的施加,进而对弹性半空间的波源问题和散射问题进行波动数值模拟,并验证了黏性边界条件的有效性。采用黏性边界和固定边界条件计算响嘡台阵3号测井的土层地震反应,并将计算结果与实际记录进行对比分析。结果表明,固定边界会造成散射波往复反射,放大了地表的地震响应,黏性边界能吸收散射的波动能量,能够较好地模拟土层地震反应。Fluctuation energy bounces back and forth in the computational domain when inputting seismic waves directly. This influences the reliability of analysis results in wave numerical simulation. Based on wave motion theories and the Spring/Dashpots elements of ABAQUS software, the viscous boundary condition is applied to simulate the radiation damping effect of infinite media in this paper. Then the viscous boundary condition is used to analyze the wave response of source and scattering problems in elastic half space. The records of Xiangtang borehole array （3# ） site are also used to validate the seismic response with the viscous boundary condition and the fixed boundary condition, respectively. The results of this study suggest that the fixed boundary condition causes the scattering wave to bounce back and forth and enlarges the surface seismic re- sponse and the viscous boundary condition can absorb the scattering wave energy and simulate seismic response of soil layer successfully.

关 键 词：ABAQUS 黏性边界 数值模拟 响嘡台阵 土层地震反应分析 

分 类 号：P315.9[天文地球—地震学]