基于IDA方法的加固震损RC框架结构地震易损性分析

Seismic Fragility Analysis of Reinforced RC Frame Structure with Seismic Damage Based on Incremental Dynamic Analysis

基于Perform-3D软件,采用碳纤维加固和粘钢加固方法对震损后的混凝土框架进行加固。分别以3、6、9层RC框架结构为研究对象,采用基于增量动力分析(IDA)的地震易损性分析方法,对震损RC框架结构的地震易损性进行研究并分析其加固效果。结果表明:①随着高度和PGA的增加,3、6、9层震损后的碳纤维和粘钢加固结构IDA曲线簇的整体收敛性均较好;②总体上粘钢加固可以提高结构对地震动随机性的收敛性,但随着结构高度的增加,对于地震动随机收敛性的增益效果逐渐减弱,该加固方法对3层高度的震损低层框架结构加固效果明显;③碳纤维加固对于结构层间位移角的控制能力较粘钢加固更强,对于6层高度的震损中层框架结构,可以更大程度地提高其对罕遇地震的抵抗能力;④对适用于9层高度的震损高层框架结构,可根据实际情况选择两种加固方法中的任何一种,均可以取得较好的加固效果。

Aiming at the seismic damage of reinforced concrete(RC)frame structures,and based on Perform-3D software,we adopt two reinforcement methods,carbon-fiber reinforcement and steel-bonded reinforcement to reinforce the earthquake-damaged concrete frame structures.Taking three-layer,six-layer and nine-layer RC frame structures as examples,we study the seismic fragility of RC frame structures with seismic damage and analyze their reinforcement effect based on incremental dynamic analysis(IDA).The results show that with the increase of strctrure's height and PGA,the overall convergence of the IDA-curve clusters of the carbon-fiber and steel-bonded reinforced structures at the third,sixth,and ninth layer are better after being damaged by earthquakes.The steel-bonded reinforcement can improve the convergence of the structure to the randomness of ground motions,but with the increase of the structure's height,the effect of steel-bonded reinforcement on the random convergence of ground motion gradually weakens,and the steel-bonded reinforcement method has obvious effect on the three-layer,low-rise structures.The carbon-fiber reinforcement has better control of the displacement angle between the structural layers than the steel-bonded reinforcement.For the six-layer,middle-rise structures,the resistance of the structure to extremely rare earthquakes can be improved to a greater extent.For the nine-layer,high-rise structures,the two reinforcement methods are practical,and we can choose one of them according to the actual situation.