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研究外贴纤维增强聚合物(Fiber Reinforced Polymer FRP)、钢筋腐蚀对混凝土柱恢复力特性的影响,是研究服役混凝土结构抗震性能的重要内容。该文根据混杂FRP加固腐蚀混凝土柱抗震性能试验结果,在完好钢筋混凝土构件的截面分析和Clough滞回规则的基础上,提出了混杂FRP加固腐蚀混凝土柱恢复力模型及其骨架曲线的确定方法。研究表明:对于受腐蚀混凝土柱,由于腐蚀作用导致钢筋与混凝土的滑移明显增大,该文通过引入钢筋滑移模型对根据平截面假定计算的骨架曲线进行修正,可获得与试验吻合的结果。混杂FRP加固腐蚀混凝土柱仍可以采用现有的滞回规则(Clough滞回规则)建立恢复力模型,但需要对卸载刚度进行修正。这将为服役混凝土结构的地震反应分析与抗震可靠性评估提供依据。
Studying the influence of Fiber Reinforced Polymer FRP and rebar corrosion on the restoring force characteristics of concrete columns is an important part of studying the seismic performance of service concrete structures. In this paper, based on the test results of the hybrid FRP reinforced concrete columns, the restorative force model of reinforced concrete columns and the determination of its skeleton curve are put forward on the basis of the analysis of the cross section of the reinforced concrete members and the Clough hysteresis rules. The results show that for the corroded concrete columns, the slippage between reinforcement and concrete is obviously increased due to corrosion. By revising the skeleton curve calculated from the cross-section assumption by introducing the steel slip model, the experimental results are obtained . Hybrid FRP reinforcement corroded concrete columns can still be used to establish the restoring force model using the existing hysteretic rules (Clough Hysteresis Rules), but the unloading stiffness needs to be corrected. This will provide the basis for seismic response analysis and seismic reliability evaluation of serviced concrete structures.