强震下砌体结构倒塌过程预测及其合理性分析

为了使用计算机仿真技术对一些因条件限制而不能完成的工作进行试验模拟、灾害预测、结构性能评估等,利用显示动力有限元软件ANSYS/LS-DYNA模拟某2层带构造柱的砌体结构振动台试验模型倒塌的过程,同时,通过模态和动力时程分析对结构的周期、振型、加速度、应力应变及位移等进行了分析,并和振动台试验结果进行了对比。结果显示,采用合适的材料模型和失效准则,ANSYS/LS-DYNA能很好地模拟倒塌过程,动力时程分析的结果和试验吻合,验证了上述倒塌过程模拟的合理性,体现了数值振动台的作用。

Collapse process prediction and reasonableness analysis of masonry structures subjected to strong earthquake

To make the wide application of the computer simulation technology in test simulation, disaster prediction and structure performance evaluation restrained by some conditions, explicit dynamic finite element analysis software ANSYS / LS DYNA was used to simulate the collapse process of masonry structure. The model has two stories and is restrained by four core tie columns which is tested by shaking table. Then,modal analysis and time history analysis were carried out. The periods, vibration modes, acceleration responses, plastic strains and deformation of the model were analyzed. Meanwhile, the analysis results were compared with the results from the shaking table test of the same model. The results show that the software can simulate the collapse process well when the suitable material model and failure criterion are used. The reasonableness of the simulating is verified by the analysis results and agrees with the results from the shaking table test. The effect of "numerical shaking table" could be displayed by software.