【摘要】 数值模拟是研究半无限域中结构地震反应的重要手段,而边界条件的选取则直接影响到数值模拟结果的可靠性。本文应用有限元软件ABAQUS,分别采用固定边界条件、黏性边界条件和远置边界条件对简单弹性半无限介质的波源问题和散射问题进行了数值模拟分析,结果显示:使用固定边界时,波动不能穿过边界面进入半无限介质,这与波动在半无限介质中传播的规律不符。通过与远置边界对比可知:使用黏性边界条件可以很好地模拟地震波穿过人工边界向半无限介质传播的真实情况,可以得到与使用远置边界相同精度的结果。更多还原

【Abstract】 Numerical simulation is an important method to study the structural vibration response.And artificial boundary conditions will directly affect the reliability of numerical simulation results.The numerical simulation of the wave source problem and scattering problem is done by the use of the finite element software ABAQUS.And the fixed boundary condition,the viscous boundary condition and remote artificial boundary condition are used.Numerical simulation results show that: when using a fixed boundary,the wave can’t through the fixed boundary into the infinite media,it is not coincident with the regulation of the wave propagating in infinite media.Comparison of the results show that: using the viscous boundary condition can well simulate the behavior of the wave motion through artificial boundary,and the precision of results is the same with the results got by the use of remote boundary condition.更多还原