不同场地下楼梯对隔震结构减震性能的影响分析

摘要

为了研究不同场地下楼梯对隔震结构减震性能的影响,本文依据场地的特征周期和频谱特性选取3种场地类别下的9条地震波作为输入激励,以某实际工程为背景,建立考虑楼梯影响和不考虑楼梯影响的两种隔震结构模型,应用数值分析软件Matlab2010对模型进行动力时程分析,研究了楼梯对不同场地下隔震结构的变形和减震效果的影响,探讨了场地对两种隔震结构模型减震性能的影响.结果表明:不同场地下楼梯对于隔震结构的变形和减震效果影响显著,考虑楼梯影响后隔震结构的上部结构变形减小,减震效果明显提高;场地对考虑楼梯的隔震结构的减震性能影响明显,随着场地土逐渐变软,楼梯对于隔震结构的减震性能影响程度逐渐减小.%In order to research the influence of the stair on the aseismic performance of isolated structure under different sites,9 sorts of earthquake waves under three kinds sites are selected as input excitation,and based on the practical engineering,two isolated structure models,which consider and not consider the influence of the stair,are established in this paper.The dynamic time history analysis of analysis of two modelsis carried out by numerical analysis software Matlab2010.The influence of stairon the deformation and aseismic effect of isolated structure under different sites is studied,and the influence of different sites on the aseismic performance of isolated structure considering the effect of stair is discussed.The results show that the stair has a great influence on the deformation and aseismic effect of isolated structure under different sites,the superstructure deformation of the isolated structure decreases and the aseismic effect.The effect of different sites has a great influence on the aseismic performance of isolated structure considering the stair,and along with the softening of site soil,the influence of stair on the aseismic performance of isolated structure is weakening gradually.