考虑FRP加固构件耗能的RC框架抗震性能评估  

Seismic performance evaluation for RC frames considering energy dissipation of components retrofitted with FRP composites

作　　者：盛国华[1,2] 朱浮声[2] 张俊[2] 

机构地区：[1]沈阳工业大学建筑工程学院,辽宁沈阳110870 [2]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《地震工程与工程振动》2014年第5期247-253,共7页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金资助项目(51008053)

摘　　要：采用能力谱法评估FRP加固RC框架结构抗震性能时,需求谱所使用的等效阻尼比是依据普通RC框架变形(延性系数)-等效阻尼比关系得到的,并未考虑FRP加固RC构件比普通RC构件多消耗能量(简称FRP构件耗能增量)对整体框架等效阻尼比的影响。根据相关试验结果拟合出FRP加固RC构件等效阻尼比表达式,计算FRP构件耗能增量,确定考虑FRP构件耗能增量的"修正"整体框架等效阻尼比。基于"修正"的框架等效阻尼比,确定FRP加固RC框架的顶点位移和关键层(加固层)层间位移,可以更加准确地评估FRP加固RC框架的抗震性能。算例表明,该方法可行。使用该方法计算结构各振型的地震反应,结合SRSS方法,可评估受高阶振型影响的FRP加固RC框架。Evaluating seismic retrofit performance of RC frame using FRP composites usually do not consider the additional energy dissipation of components retrofitted with FRP composites compared with the original ones based on capacity spectrum method. According to the test data,the equivalent damping ratio expression of components retrofitted with FRP composites is derived,and the additional energy dissipation can be calculated by using it. The whole frame＇s equivalent damping ratio considering additional energy dissipation is found on the basis of its definition. The seismic retrofit performance of RC frame using FRP composites can be evaluated more accurately by using＂fix＂frame＇ equivalent damping ratio. The example shows that the proposed method is feasible and can be apply to the RC frame retrofitted with FRP composites which is influenced by high modes.

关 键 词：FRP 耗能 等效阻尼比 能力谱法 

分 类 号：TU375.4[建筑科学—结构工程] P315.92[天文地球—地震学]