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考虑FRP加固构件耗能的RC框架抗震性能评估

DOI: 10.13197/j.eeev.2014.05.247.shenggh.031, PP. 247-253

Keywords: FRP,耗能,等效阻尼比,能力谱法

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Abstract:

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。

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