（同济大学土木学院建筑工程系，上海 200092）
［摘要］采用基于B-R运动准则的改进判别方法，结合结构时程响应曲线判定弦支穹顶结构的动力稳定性，研究拉索预应力、矢跨比对弦支穹顶动力稳定性能的影响。算例分析研究表明，在动力荷载作用下存在一组最优预应力，此时结构动力稳定临界荷载较大；在不同预应力作用下，随着矢跨比增大，结构临界荷载增大；在同一预应力作用下，随着矢跨比增大，结构临界荷载增大但幅度很小。
［关键词］弦支穹顶；预应力；临界荷载；动力稳定
Influence of pre-stress on dynamic stability of suspen-domes
Liu Huijuan, Luo Yongfeng（Department of Building Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China)
Abstract:Based on B-R criteria,combined the method and time history response curves, the dynamic stability of suspen-domes was judged. The dynamic stability characteristics with different pre-stress values were analyzed under three-dimensional seismic excitation. The numerical results show that there is a group of optimal pre-stresses under which the critical dynamic load of the structure is higher; Under different pre-stress, the critical dynamic load of the structure increases with the increase of the ratio of rise to span. While under the same pre-stress, the increasing magnitude gradually decreases.
Keywords:suspen-dome; pre-stress; critical load; dynamic stablity
*世博场馆大空间结构安全保障关键技术（05dz05812）。
作者简介：刘慧娟，博士研究生，Email:lhj8110@163.com。
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