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分别采用振型分解反应谱法和时程分析法,考虑结构的几何非线性和预应力效应,计入阻尼比和前50阶振型的贡献,以郑州国际会展中心展厅钢屋盖为例计算了预张力钢结构屋盖在水平地震作用以及竖向地震作用下的动力反应。结果表明:抗震分析必须计算竖向地震作用;振型分解反应谱法能够反映出结构的地震响应规律;有必要对大跨空间结构进行时程分析;桅杆是主要受力构件。分析结果为抗震设计提供了参考依据,可以进一步了解和掌握此类新型结构。
Taking the geometrical nonlinearity and the prestressing effect of the structure into account, the damping ratio and the contribution of the first 50 modes are taken into account respectively using the modal decomposition response spectrum method and the time history analysis method, taking the steel roof of Zhengzhou International Convention and Exhibition Center as an example The dynamic response of prestressed steel structure roof under horizontal seismic action and vertical earthquake action. The results show that the vertical seismic action must be calculated in the anti-seismic analysis. The mode decomposition response spectrum method can reflect the seismic response law of the structure. It is necessary to conduct the time-history analysis of the long-span spatial structure. The mast is the main force component. The results provide a reference for earthquake-resistant design, which can further understand and master the new structure.