预张力钢结构屋盖的抗震反应方法研究

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。

STUDY ON SEISMIC ANALYSIS METHoDS OF PRE-TENSIONED STEEL ROOFS

In this paper,a rectangular unit of steel roof in Zhengzhou International Conference Exhibition Center is taken as example and the response spectrum method and time-history method are respectively adopted to explore seismic performances. Geometry nonlinearity and pre-tensions are included in analysis,and the damping ratio and contribution of the former fifty modes are considered. The dynamic actions under horizontal earthquake and vertical earthquake are analyzed. The results indicate that 1) the vertical earthquake action must be taken into account during the process of seismic design; 2) the rules of earthquake action can be gained by means of response spectrum method; 3) it is necessary to carry the time-history analysis for big-span structures; 4) the masts are primary structural load-bearing members,The above analysis can provide a basis of further design and research for this new type of structures.