Seismic fortification intensity has been adjusted in some areas which were affected in the Wenchuan -earthquake. It was seismic strengthening for most of the buildings especially the public buildings after the adjustment. In order to ensure the seismic performance of the structure after reinforcement ,the analysis method based on performance was gradually applied in the large and complex engineering structure analysis. A large span sports training center was used taking construction as background. According to the fact that the fortification intensity was improved from 6 degrees to 7 degrees, Push - Over method was used to analyze the structures elastic - plastic performance under the action of the rare earthquake of 7 degrees by using the finite element models with the mild steel damper before and after reinforcement. The internal force , deformation and destruction of the structure were studied in the action of the rare earthquake, comparing the dynamic characteristics and seismic performance of the models, and researching distribution of weak links and plastic hinge of the models under the large earthquake. The results show that the models can meet collapse resistant checks under 7 degrees of the rare earthquake before and after reinforcement. The second floor of the original structure is relatively weak, and it can emerge local damage easily. But the structure' s stiffness is more uniform after reinforcement, and the structure has large resistance of the collapsed ability.%汶川大地震后,受影响的部分地区设防烈度进行了调整,设防烈度调整后大部分建筑尤其是公共建筑都进行了抗震加固,为了保证加固后结构的抗震性能,在大型复杂工程的结构分析中逐渐采用了基于性能分析方法.以地震时正在修建的某大跨度体育教学训练中心为背景,针对设防烈度提高由6度提高至7度的情况,采用P ish-Over法对其采用软钢阻尼器加固前后的有限元模型进行7度罕遇地震作用下结构的弹塑性分析,研究该结构在7度罕遇地震作用下的内力、变形与破坏情况,比较加固前后结构模型的动力特性与抗震性能,研究结构在大震作用下的薄弱环节与塑性铰的分布特点.研究结果表明:加固前后模型均能满足7度罕遇地震抗倒塌验算,但是,原结构二层位置较为薄弱,容易发生局部破坏,而加固后结构刚度更为均匀,大震下的抗倒塌能力增强.
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