C F RP加固震损钢筋混凝土框架结构的抗整体性倒塌能力分析

首先介绍了CFRP加固受损钢筋混凝土柱的数值模拟方法，通过OpenSees软件进行了建模分析，数值模拟结果与试验结果的对比验证了该数值模型的有效性；其次，对一6层钢筋混凝土框架以受极罕遇地震影响进行预损，采用损伤指数和折减系数的方法建立震损钢筋混凝土框架的分析模型，并选择5种不同的CFRP加固方案对其进行加固；最后，对CFRP加固的震损RC框架进行增量动力分析。定量的评价了CFRP加固震损RC框架的抗整体性倒塌能力和抗倒塌安全储备。结果表明:CFRP加固能有效提高震损钢筋混凝土框架结构的抗震性能。加固部位的选择对加固效果的影响很大，在所选用的5种CFRP加固方案中，对底层及第2层的梁柱进行加固的方案对提高震损钢筋混凝土框架的抗整体性倒塌能力效果最佳。

Global collapse resistance capacity analysis on earthquake-damaged reinforced concrete frame structures retrofitted with CFRP

Firstly,the numerical simulation method of damaged reinforced columns retrofitted with CFRP was introduced,and an analytical model was established via OpenSees software.The comparison between numerical simulation results and experimental results shows the validity of the model.Secondly,a 6-storey RC frame was pre-damaged under the extremely rare earthquake.The damage index and reduction coefficient were used to establish the numerical model of the earthquake-damaged RC frame.Five different retrofitting strategies with CFRP were adopted to reinforce the frame.Finally,incremental dynamic analysis was carried out for the earthquake-damaged RC frames retrofitted with CFRP.The global collapse resistance capacity and collapse margin ratios of earthquake-damaged RC frame retrofitted with CFRP were evaluated quantitatively.The results show that the CFRP retrofitting strategies can effectively improve the seismic performance of the damaged structure.The selection of retrofitting locations has a great influence on the retrofitting effect.Among the adopted retrofitting strategies,the one to strengthen the columns and beams in the first strorey and second storey is the best in improving the global collapse resistance of the earthquake-damaged RC frames.