基于时程分析法的砌体结构爆破地震响应分析

Analysis of Blasting Vibration Responses of Masonry Structure Based on Time History Analysis Method

基于MATLAB弹塑性时程分析的程序,以设计的一系列砌体结构为分析对象,分别对结构的水平双向输入多种实测爆破地震波,解出了结构各向弹塑性地震响应幅值结果,分析了结构层数、受震方向、爆破地震波主频等因素对砌体结构的动力响应的影响.结果表明,砌体结构刚度较小的方向为抗震薄弱方向,首层位移响应往往大于其余各层位移;结构随着层数的增加,其首层振动响应会降低,抗震性能会提升;爆破地震波主频对结构弹塑性动力响应的影响与结构自振频率分布有关,越相近时结构的动力响应就越大,相远时动力响应就越小.

Based on elastic-plastic time history analysis program of MATLAB, a series of masonry structure was designed as the analysis object, and various practical blasting seismic signals were input to the two horizontal direction of the structure, respectively. The results of seismic response amplitude of elastic-plastic masonry structures in each direction were obtained, and the influence of layer number, earthquake direction and main frequency about structure dynamic response were analyzed. The results show that the direction with the smaller stiffness of the masonry structure is the weaker direction under earthquake, and the displacement of the first layer is usually lager than that of the other layers. With the increase of the number of layers, the vibration response of the first layer of the structure will be reduced, and the seismic performance will be improved. The influence of main frequency of blasting seismic wave on the structure’s elastic-plastic dynamic response is mainly related to structure’s natural frequency distribution. The dynamic response become larger when it approached;otherwise, smaller.