三维黏弹性人工边界地震波动输入方法研究  

Research on seismic wave input with three-dimensional viscoelastic artificial boundary

作　　者：张波[1] 李术才[1] 杨学英[2] 王锡平[3] 

机构地区：[1]山东大学岩土与结构工程研究中心,济南250061 [2]山东城市建设职业学院,济南250014 [3]山东大学土建与水利学院,济南250061

出　　处：《岩土力学》2009年第3期774-778,共5页Rock and Soil Mechanics

基　　金：国家自然科学基金委面上项目(No.50574053);国家杰出青年基金(A类;No.50625927)

摘　　要：对三维黏弹性人工边界给出了一种实用的地震波动输入方法。用等效边界力法进行地震波动输入时,把入射地震波假设为竖直向上入射的平面波,使施加在人工边界上的总荷载可以由输入波位移和速度的关系式完全表达,使地震动输入更容易在有限元计算程序中实现。解决了三维黏弹性人工边界采用球面波进行地震波动输入会出现尚待确定的未知项,不易实现地震波动的输入的困难。数值算例表明,该地震波动输入方法是十分有效的。A practical method of seismic wave input on three-dimensional viscoelastic artificial boundary is presented. Taking vertical plane wave as incident seismic wave, the loads applied on artificial boundaries can be expressed by displacements and velocities of input wave, which makes the earthquake easy to input. The difficulty that there is an unknown term which makes seismic wave difficult to input when the seismic wave input is made by spherical wave is overcome. The accuracy of the presented seismic wave input method is demonstrated by numerical examples.

关 键 词：结构-地基相互作用 黏弹性人工边界 地震波动输入 

分 类 号：TU435[建筑科学—岩土工程]