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为了进一步推广多维多点非平稳虚拟激励法在工程中的应用和解决传统虚拟激励法在通用有限元中实现困难等问题,以一座铁路钢构桥为例,基于ANSYS软件平台,研究了虚拟激励法在实际工程抗震分析中的应用问题,通过在总质量矩阵上“置大数”的方法,将单维单点激励扩展到多维多点虚拟激励,并将非平稳激励转化为一系列确定性外力作用,从而避免了求解静力影响矩阵的繁琐。研究结果表明:所采用的方法具有较高的精度,并能高效地将多维多点非平稳虚拟激励法与通用有限元软件结合,节约了自编程序的时间,使得工程师更容易接受和运用。
In order to further promote the application of multi-dimensional multi-point non-stationary virtual excitation method in engineering and to solve the problems of traditional virtual excitation method in general finite element, a railway steel structure bridge is taken as an example. Based on ANSYS software platform, Method is applied to the seismic analysis of practical engineering. By expanding the number of single-point excitations into multi-dimensional and multi-point virtual stimuli by converting the total mass matrix into large numbers, the non-stationary stimuli are transformed into a series of Determine the role of external forces, thus avoiding the complex solution of static influence matrix. The results show that the proposed method has high accuracy and can efficiently combine the multi-dimensional multi-point non-stationary virtual excitation method with general finite element software to save the time of self programming and make it easier for engineers to accept and use.