地震作用下某大型隔震博物馆楼层波及楼层反应谱研究

Floor wave and floor response spectrum research of one large base-isolated museum under earthquake

为了得到隔震博物馆类框架结构准确的楼层响应及楼层反应谱,以国内某实际隔震博物馆为基础,建立结构有限元模型并利用环境振动测试进行模态验证。选择7条地震波调幅进行时程分析,通过时程曲线频谱、加速度峰值两参数分析楼层波与地震波的差异。在此基础上,通过MATLAB程序计算楼层加速度反应谱,拟合用于展陈设计的标准化设计反应谱。研究结果表明:有限元模型动力特性与实测结果吻合较好;在地震作用下,1～3层展厅处的加速度峰值较其它层低,楼层波频谱的频率范围主要为低频段,楼层波卓越频率为结构自振频率。楼层波与地震波差异较大;楼层加速度反应谱是地震波与结构共同作用的结果;得到了展厅处加速度标准化设计谱曲线及数学表达,提出展陈及文物的防震设计方法。

In order to obtain the floor response and floor acceleration response spectrum of seismic isolated museum, a finite element model of actual isolated museum was established. The model was verified through environment vibration tests. 7 seismic time history curves were chosen to analyze the model. The difference between floor wave and seismic wave was analyzed through peak acceleration and frequency spectrum. The floor acceleration response spectrum was calculated through MATLAB and the design spectrum was fitted. The results show: the dynamic characteristics of FEM are in a good agreement with test values;The peak acceleration of 1-3 layers is lower than other layers. The frequency spectrum mainly ranges for low frequencies. The predominant frequency of floor wave is the natural frequency of structure. The difference between floor wave and seismic wave is great. The floor acceleration response spectrums is the result of earthquake working together with structure;The floor acceleration design response spectrum and mathematical formula were gotten. The seismic protection design method for exhibition tool and cultural relics was put forward.