负弯矩作用下钢管混凝土组合框架端板连接节点的抗弯承载力计算方法  

Calculation methods for flexible capacities of end plate joints for CFST composite frames under negative moments

作　　者：王静峰[1,2] 龚旭东[1] 姜涛[1] 

机构地区：[1]合肥工业大学,安徽合肥230009 [2]安徽省土木工程结构和材料省级实验室,安徽合肥230009

出　　处：《土木工程学报》2014年第2期52-61,共10页China Civil Engineering Journal

基　　金：国家自然科学基金(51178156,50808062);教育部新世纪优秀人才计划项目(NCET-12-0838).

摘　　要：为了获悉负弯矩作用下钢管混凝土组合框架端板连接节点的抗弯承载力,给出组合节点的失效模式,建立对称荷载和非对称荷载作用下组合节点的力学模型,详细考虑柱截面类型、端板类型、荷载类型、楼板组合作用的影响。基于节点失效模式,分别提出钢筋抗拉承载力、螺栓抗拉承载力、连接抗压承载力等组件承载力的简化计算方法。根据力学平衡原理和力学模型,利用组件法,确定组合节点受弯中和轴位置,分别提出平齐端板连接和外伸端板连接钢管混凝土组合节点在负弯矩作用下的承载力计算公式。用试验结果验证了所提组合节点抗弯承载力简化计算方法的正确性,研究成果可为建立半刚性钢管混凝土组合框架设计理论提供科学依据。To learn about the flexible capacities of end plate connections for concrete-filled steel tubular （CFST） composite frame under negative moments, failure models of the composite joints are given. Mechanical models of composite joints under symmetrical and non-symmetrical loading are proposed respectively. Effects of end plate type, column section type, load type and composite action of slab are considered. Based on failure models, simplified calculation methods for reinforced tensile capacity, bolt tensile capacity and joint compressive capacity are suggested respectively. According to the mechanical equilibrium principle and mechanical model, location of plastic natural axis was determined by the component method. The calculation methods of the flexible capacities of flush and extended end plate composite joints under negative moments are proposed respectively. The proposed simplified methods for the flexible capacities of composite joints are verified by test results. The research results can provide scientific reference for the design of semi-rigid CFST composite frames.

关 键 词：端板连接 钢管混凝土组合节点 抗弯承载力 负弯矩作用 组件法 

分 类 号：TU377[建筑科学—结构工程]