多维多点虚拟激励法在ANSYS中的应用  

Pseudo excitation method applied to multi-dimensional and multi-support excitations in ANSYS

作　　者：贾宏宇[1] 郑史雄[1] 陈冠桦[2] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]贵州省交通规划勘察设计研究院,贵州贵阳550001

出　　处：《地震工程与工程振动》2012年第4期7-12,共6页Earthquake Engineering and Engineering Dynamics

基　　金：铁道部科技研究开发计划项目(2010-G018-A-4)

摘　　要：为了进一步推广多维多点虚拟激励法在工程中的应用,以通用有限元软件ANSYS谐分析模块为平台,在结构有限元模型各支撑处激励方向上置大质量块后,直接将地震虚拟激励荷载施加于大质量块上,运用绝对位移直接求解运动方程。与传统虚拟激励法相比,该法不必将绝对位移分解为拟静力位移项和动力相对位移项,避免了求解静力影响矩阵的繁琐,能更高效地实现多自由度大跨结构多维多点虚拟激励荷载在通用有限元软件中的输入与分析,而且不需要编制专门的计算程序,使得工程师更容易接受和运用。In order to promote the application of multi-dimensional and multi-support pseudo excitation method in engineering, based on general-purpose finite element software ANSYS harmonic analysis module as a platform, a large mass sul-jected to pseudo excitation load was put on structure support and it was conducted to directly solve the equations of motion by absolute displacement method. Compared to traditional pseudo excitation method of multi-dimensional and multi-support, directly solving method through absolute displacement does not decompose the absolute displacement into quasi-static and dynamic relative displacement items, avoids solving the static influence matrix, more efficiently realizes the multiple degree of freedom input and analysis of pseudo excitation load in the fi- nite element software, and does not require special preparation, it will be easier for engineers to accept and use.

关 键 词：虚拟激励法 多维多点 绝对位移 静力影响矩阵 虚拟激励荷载 

分 类 号：TU311.3[建筑科学—结构工程]