摘要
基于ABAQUS平台,建立了预应力型钢混凝土梁-钢管混凝土叠合柱框架中节点精细化数值有限元模型,计算得到了柱顶水平荷载-位移滞回和单调加载曲线。在对比计算单调加载和实测滞回曲线基础上,研究了节点在柱顶水平荷载下的破坏全过程,细致考察了框架中节点的混凝土、型钢骨架、钢筋骨架以及预应力筋的应力状态,探讨了此类框架节点的破坏机理;基于参数分析结果,研究了轴压比、预应力度、核心区钢管配钢率和配箍率对节点柱顶水平荷载-位移曲线和核心区剪力-剪切变形的影响,提出了节点核心区受剪承载力计算公式。研究结果表明,当节点试件水平荷载达到峰值点时,核心区钢管、箍筋及预应力筋均达到屈服,核心区混凝土被压碎,此时可作为节点核心区抗剪承载力计算的标志;提出的节点核心区的抗剪承载力计算公式,可供工程设计参考。
Based on ABAQUS platform,a refined numerical finite element model of joints in prestressed steel reinforced concrete beam-concrete filled steel tubular composite column frame was established,and the lateral hysteretic and monotonic load-displacement curves at the column top were calculated.On the basis of the comparison of the calculated monotonic and the measured hysteresis curves,the failure process of the joints under lateral loading at the column top was studied,and the stress for concrete,steel skeleton,steel bars and prestressing tendons were carefully investigated,in which the failure mechanism was discussed.Otherwise,the influences of axial compression ratio,prestressing level,steel tube ratio and stirrup ratio in the panel zone on the lateral loaddisplacement curve at column top and shear-shear deformation in the panel zone were studied according to the results of parameter analysis.Finally,the formulas for calculating the shear capacity in the panel zone of the joint were proposed.The results showed that the steel-tube,stirrups and prestressed tendons reached the yield and the concrete crushed in the panel zone when the lateral load reached the peak value,which could be deemed as the sign for calculating the shear capacity.The presented formula for calculating the shear capacity could be used for a reference in engineering design.
作者
王琨
查志远
刘宏潮
陈再现
WANG Kun;ZHA Zhi-yuan;LIU Hong-chao;CHEN Zai-xian(Hunan Province Engineering Laboratory of Bridge Structure(Changsha University of Science&Technology),Changsha,Hunan 410015,China;College of Civil Science and Engineering,Yangzhou University,Yangzhou,Jiangsu 225127,China;Department of Civil Engineering,Harbin Institute of Technology(Weihai),Weihai,Shandong 264209,China)
出处
《工程力学》
EI
CSCD
北大核心
2020年第8期89-101,共13页
Engineering Mechanics
基金
长沙理工大学桥梁结构安全控制湖南省工程实验室开放基金资助项目(16KD01)
国家自然科学基金项目(51878589)
江苏省“六大人才高峰”人才项目(2017-JZ-038)
扬州市科技计划项目(YZ2018068)
中国博士后科学基金项目(2019M651762)。
关键词
预应力型钢混凝土梁
钢管混凝土叠合柱
框架节点
受剪性能
有限元模型
prestressed steel reinforced concrete beam
steel-tube reinforced concrete column
frame joint
shear capacity
infinite element model
