实用多点输入虚拟激励法在通用有限元软件中的实现

Implementation of the practical pseudo excitation method for multi-support seismic response analysis in general FEM software

虚拟激励法是高效便捷的随机振动分析方法,可用于地震多点输入随机响应分析,但现有通用有限元软件无法直接实现多点输入虚拟激励法。首先将虚拟激励法改进为更实用的形式,使其便于编程实现,然后借助有限元软件ANSYS的二次开发功能实现了多点输入虚拟激励法在ANSYS中的应用,扩展了ANSYS在地震多点输入计算领域的功能,也为地震多点输入研究提供了更为简便有效的计算平台。对一简单模型多点输入的理论解析解和ANSYS计算结果进行比较,验证了该实现方法的准确性和可行性。

The pseudo excitation method for multi-support seismic response analysis, which is a kind of high efficient random vibration analysis method, hasn＇ t been used in existing general FEM software. The pseudo excitation method is expressed in a practical form, which is suitable for programming realization. Then the pseudo excitation method is implemented in ANSYS by using the APDL （ANSYS Parametric Design Language）. Thus, multi-support seismic response analysis capability of ANSYS is increased, and a simple and effective approach for multi-support seismic response analysis is supplied to researchers. Comparison between numerical calculation results obtained by ANSYS and analytic results of a simple structure model is made to verify the accuracy and feasibility of the implementation method.