摘要
建立竖板-栓钉连接钢管混凝土(CFST)柱-钢筋混凝土(RC)梁节点试件(SSJD)拟静力加载试验有限元模型,并在节点损伤情况、梁端荷载-位移曲线等数值模拟结果与试验结果吻合较好的基础上,进一步开展了RC梁混凝土强度、配筋率ρ_(s)和连接竖板长度L_(b)及界面连接情况等对CFST柱-RC梁节点梁端塑性铰区域力学性能的影响。研究结果表明,RC梁混凝土强度对试件SSJD塑性铰区域受力性能的影响较小;适筋范围内RC梁配筋率增加可适当提高试件SSJD承载力和延性;随着连接竖板长度的增加,梁端塑性铰区域外移,梁破坏荷载增大;本研究给出的RC梁与CFST柱之间的界面抗剪承载力模拟值与计算值吻合较好,可用于界面抗剪设计。
The finite element model of the joint specimens(SSJD)of the concrete-filled steel tube(CFST)column-reinforced concrete(RC)beam connected by the vertical plate-stud connection is established,for which the joint specimens are subjected to the pseudo-static loading experiment.On the basis that the numerical simulation results of the joint damage condition and load-displacement curves are in good agreement with the test results,the further numerical simulation analysis is carried out on the influence of the mechanical properties of the plastic hinge zone at the beam end of the joint connected by the steel plate-stud,according to the changes of the RC beam concrete strength,the reinforcement ratioρ_(s),the length L_(b) of the connecting vertical plate,and the different connection conditions of the interface.The results show that the change of RC beam concrete strength has little effect on the mechanical performance of the SSJD plastic hinge zone of the specimen;the increase inρ_(s) of the RC beam within the range of suitable reinforcement can appropriately improve the bearing capacity and ductility of the SSJD specimen;with the increase of L_(b),the plastic hinge area at the beam end moves outward,and the beam failure load increases.The calculated value of the interface shear capacity is in good agreement with the simulated value,which can be used for interface shear design.
作者
马华
阚吉平
赵玉坤
李振宝
Ma Hua;Kan Jiping;Zhao Yukun;Li Zhenbao(Key Laboratory of Urban Security and Disater Engineering,Ministry of Education,Beijing University of Technology,Beijing 100124,China)
出处
《震灾防御技术》
CSCD
北大核心
2022年第2期381-391,共11页
Technology for Earthquake Disaster Prevention
基金
国家自然科学基金(51978014)。
