装配式复合箍筋约束高强混凝土柱恢复力模型研究  

Restoring force model of prefabricated high strength concrete columns confined by composite stirrups

作　　者：李升才 白巨巨 朱永甫 LI Shengcai;BAI Juju;ZHU Yongfu(Southeast Coast Engineering Structure Disaster Prevention and Reduction Engineering Research Center of Fujian Province University,School of Civil Engineering,Putian University,Putian 351100,China;School of Civil Engineering,Huaqiao University,Xiamen 361021,China;Fujian Engineering Research Center for Construction and Management of Green Buildings,Minnan University of Science and Technology,Quanzhou 362700,China)

机构地区：[1]莆田学院土木工程学院东南沿海工程结构防灾减灾福建省高校工程研究中心,福建莆田351100 [2]华侨大学土木工程学院,福建厦门361021 [3]闽南理工学院绿色建筑施工与管理福建省高校工程研究中心,福建泉州362700

出　　处：《振动与冲击》2022年第10期205-214,共10页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(51578253);福建省科技引导性项目(2020Y0087);泉州市科技计划项目(2018C083R);华侨大学研究生科研创新基金资助项目(18013086001)。

摘　　要：对6个装配式复合箍筋约束高强混凝土柱及1个现浇对比柱进行循环往复加载试验,主要研究了轴压比、配箍率对装配柱的骨架曲线及滞回特性的影响。试验结果表明:装配柱在骨架曲线及滞回特性上与现浇柱有着较为明显的特征差异;当轴压比减小或配箍率增大时,装配柱的滞回环变得丰满,初始刚度增加,承载力衰减速率减小,卸载刚度退化速率变慢。根据试验结果和现有恢复力模型理论,提出了考虑轴压比和配箍率影响的适用于装配柱的三折线恢复力模型。通过对骨架曲线特征参数的计算并与试验骨架曲线对比,两者吻合较好;在此基础上提出相应的滞回规则,计算得到的恢复力模型与装配柱滞回曲线较为一致,这表明所建议的恢复力模型可较好地反映轴压比和配箍率对其滞回特性的影响,可为该装配柱的结构弹塑性分析及工程应用提供参考。Six specimens of prefabricated high strength concrete columns confined by composite stirrups and one cast-in-situ control specimen were tested under cyclie lateral loads.The influences of axial compression ratio and volume-stirrup ratio on the skeleton curve and hysteretic characteristics of the columns were mainly considered in the test.The test results show that the prefabricated column has obvious characteristic differences from the cast-in-place column in the skeleton curve and hysteresis characteristics;when the axial compression ratio decreases or the stirrup rate increases,the hysteresis loop of the prefabricated columns becomes fuller,the initial stiffness increases,the attenuation rate of the bearing capacity decreases,and the degradation rate of the unloading rigidity slows down.According to the test results and the existing theory of restoring force model,a three-fold line restoring force model suitable for prefabricated columns considering the influence of axial compression ratio and stirrup ratio was proposed.Calculating the characteristic parameters of the skeleton curve and comparing with those of the experimental skeleton curve,it is found the two agree well.On this basis,the corresponding hysteresis rules were proposed.The calculated restoring force model is consistent with the hysteresis curve of the prefabricated column,which shows that the proposed restoring force model can better reflect the influence of the axial compression ratio and the stirrup ratio on its hysteretic characteristics.

关 键 词：复合箍筋 高强混凝土柱 装配式 拟静力试验 恢复力模型 

分 类 号：TU375.3[建筑科学—结构工程] TU317.1