摘要
以大型有限元软件ANSYS为平台集中比较了目前工程中广泛应用的几种人工边界条件,详细分析了半无限地基在各种人工边界以及不同频率的输入荷载作用下的动力分析结果的精确性和稳定性,对重力坝-基岩系统地震响应进行了数值分析。结果表明,人工边界的模拟精度与输入荷载的动力特性以及介质的弹性波速存在紧密的关系,当荷载激励频率较高时,相对较高的弹性波速才能保证人工边界的稳定性;黏弹性人工边界简单实用,能更好地模拟人工边界外半无限介质的弹性恢复性能和能量辐射作用。
Based on ANSYS,several artificial boundary conditions widely applied in the engineering projects are compared. The numerical preci-sion and stability of the artificial boundary condition applied on a semi-infinite foundation were discussed under different frequency input loads. At last,the dynamic response of dam-foundation was analyzed by numerical method. The results show that the simulation accuracy of artificial bounda-ry conditions has close relations to inputted force dynamic character and material elastic wave velocity. The stability of the artificial boundary is en-sured under the high excitation frequency with high material elastic wave velocity. Viscoelasticity artificial boundary method has the merits of simple implementation and powerful practicality,simulating semi-infinite medium elastic recovery propertied and energy radiation well.
出处
《人民黄河》
CAS
北大核心
2014年第7期109-111,114,共4页
Yellow River
关键词
水工结构
人工边界
重力坝
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地基系统
动力分析
地震波
hydraulic structure
artificial boundary condition
gravity dam-foundation system
dynamic analysis
seismic wave
