考虑开孔钢板厚度的PBL剪力键力学性能研究  

RESEARCH ON MECHANICAL PERFORMANCE OF PBL SHEAR CONNECTORS CONSIDERING THE PERFORATED PLATE’S THICKNESS

作　　者：肖林[1] 强士中[1] 李小珍[1] 卫星[1] 

机构地区：[1]f西南交通大学土木工程学院,成都610031

出　　处：《工程力学》2012年第8期282-288,296,共8页Engineering Mechanics

基　　金：国家自然科学基金项目(50808150);清华大学土木工程安全与耐久教育部重点实验室开放基金项目;西南交通大学优秀博士论文培育项目

摘　　要：钢-混凝土组合结构中PBL剪力键的力学性能受到多种参数的影响。为了解开孔钢板厚度对PBL剪力键力学性能的影响,进行了6组24个PBL键试件的推出试验,研究PBL键的静力性能及影响因素;从荷载-滑移曲线出发对PBL键的传力机理进行分析;研究PBL键的破坏机理和开孔钢板厚度对破坏模式的影响。试验研究结果表明:开孔钢板的厚度对PBL键的设计承载力、抗剪刚度和极限承载力都有显著影响;荷载较小时PBL键的承载能力由混凝土榫抗剪提供,混凝土榫抗剪失效后转由贯穿钢筋抗剪承载;受开孔钢板厚度的影响,PBL键的破坏形式有贯穿钢筋的弯剪破坏、剪切破坏或开孔钢板的剪切破坏。结合国内典型推出试验的结果,推导了考虑开孔钢板厚度的PBL键承载力计算公式,公式与试验结果吻合良好。The mechanical properties of PBL shear connectors used in steel-concrete composite structures are influenced by various parameters. Push-out tests of 24 specimens in 6 groups are conducted to investigate the influence of perforated plate＇s thickness on the mechanical properties of PBL shear connectors. Based on the load-slip curve, the load transfer mechanism and the failure mechanism of PBL shear connectors are analyzed. The impact of perforate plate＇s thickness on failure mode was studied. The following conclusions are obtained from the research. The design bearing capacity, shear stiffness and ultimate bearing capacity are significantly influenced by the thickness of the perforated plates. The major shear resistance of PBL shear connectors is initially provided by concrete dowels when the load is relatively small, and then provided by perforated rebar after the concrete dowels＇ failure. Under the influence of the perforated plate＇s thickness, the failure modes of PBL shear connector include flexural and shear failure of perforate rebar, shear failure of perforate rebar and shear failure of perforate plates. In combination with domestic typical push-out tests, the beating capacity formula of PBL shear connectors considering the perforate plate＇s thickness is deduced and proved by experimental results.

关 键 词：钢-混凝土组合结构 PBL剪力键 推出试验 静力性能 传力机理 破坏机理 承载力计算公式 

分 类 号：TU398[建筑科学—结构工程]