中文摘要：

单层球面网壳属于损伤敏感型结构,损伤对网壳的抗震性能十分不利.BRB（约束屈曲支撑）由于耗能性好、施工安装方便、设计灵活等优点成为已建结构抗震加固和改造的重要手段.首先,介绍了计算分析时所采用的模型尺寸与相关参数;然后,通过模态试验进行损伤评价并提出三种抗震加固方案,由El-Centro波、天津波、Taft波罕遇地震作用下的弹塑性响应结果进行方案对比;最后,从四个不同的方面对网壳进行抗震加固效果的规律性分析.结果表明：采用BRB加固后的结构能够很好地改善结构的抗震性能;随着跨度的增大,结构的响应不断加大,BRB的抗震加固效果也比较明显;BRB的屈服强度为80MPa和100MPa,截面尺寸为0.8倍和1.0倍原杆截面时抗震加固效果较好;随着罕遇地震加速度峰值的增长,BRB对受损网壳的抗震加固效果也越好.

英文摘要：

Single layer reticulated shell is the damage-sensitive structure, and damage is very unfavorable to its structural seismic performance. BRB （Buckling Restrained Bracing）, which can be easily installed, designed flexibly and energy dissipated well, has been widely used in structural seismic retrofit. Firstly, model size and related parameters used in the calculation are introduced. Secondly, damage assessment is carried out through modal test and three seismic retrofit programs are proposed. Elastoplastic responses under earthquake records are presented. Lastly, regularity analysis on seismic retrofit effect from 4 different aspects is carried out. The results show that the BRB-retrofit structure has better damping, effect. With increase of the span, structural response continues to grow and the effect of seismic retrofit with BRB is relatively obvious. The seismic retrofit effect is good when yield strength of BRB is 80MPa and 100MPa, and section size is 0. 8 times and 1 times of the original bar section. As earthquake acceleration peak grows, seismic retrofit effect is better.