带楼板复式钢管混凝土柱-钢梁组合节点恢复力模型研究  

Restoring force model of composite joints of concrete-filled double-skin steel tubular column to steel beam with reinforced concrete slab

作　　者：马青 张冬芳[2] 杜琼飞 康彦彪 MA Qing;ZHANG Dongfang;DU Qiongfei;KANG Yanbiao(Shaanxi Provincial Transport Planning Design and Research Institute Co.,Ltd.,Xi'an 710065,China;School of Civil Engineering,Chang'an University,Xi'an 710061,China)

机构地区：[1]陕西省交通规划设计研究院有限公司,陕西西安710065 [2]长安大学建筑工程学院,陕西西安710061

出　　处：《四川建筑科学研究》2024年第6期25-34,共10页Sichuan Building Science

基　　金：陕西省交通运输厅2023年度科研项目(HHZB-2023-066);国家自然科学基金项目(51508028);陕西省自然科学基础研究计划项目(2021JM-165)。

摘　　要：楼板(指钢筋混凝土楼板,即RC楼板)作用使组合节点的梁柱线刚度比发生变化,对其承载力、破坏形态及滞回性能的影响均较大,而现有的恢复力模型均未考虑楼板初始刚度的影响。基于带楼板复式钢管混凝土柱-钢梁组合节点拟静力试验,研究了试件的骨架曲线特征,提出了此类组合节点的三折线骨架曲线模型;考虑楼板对组合节点初始刚度的影响,分析了刚度退化和滞回规则,推导并建立了带楼板复式钢管混凝土柱-钢梁组合节点的恢复力模型,采用试验数据验证了该恢复力模型的正确性。研究结果表明:楼板作用对节点的初始刚度影响显著,同时提高了节点的极限荷载;文中建立的恢复力模型能较准确地反映该类组合节点的滞回特性。The RC slab has a great influence on the bearing capacity,failure mode and hysteretic behavior of composite joints because of the changes of the beam-column stiffness ratio.However,the existing restoring force models do not consider the effect of the initial stiffness of RC slabs.Therefore,based on the quasi-static test of composite joint of concrete-filled double-skin steel tubular(CFDST)column to steel beam with RC slab,the characteristics of skeleton curves for the specimens were investigated in this study.A three-fold skeleton curve model of the composite joint specimens was proposed according to the skeleton curves of the specimen.Considering the effect of RC slab on the initial stiffness of composite joint,the restoring force model of composite joint was derived and established according to the stiffness degradation and hysteresis rules,which was verified by the experimental data.The results show that the RC slab has a significant effect on the initial stiffness of joints and improves the ultimate load of joints.The restoring force model in this study can accurately reflect the hysteretic characteristics of the type of composite joint.

关 键 词：复式钢管混凝土柱 组合节点 楼板作用 初始刚度 恢复力模型 

分 类 号：TU398[建筑科学—结构工程]