钢-混凝土组合梁螺栓连接件受剪性能试验研究  

Experimental study on the shear behavior of a bolt connector in a steel-concrete composite beam

作　　者：杨勇[1,2] 张树琛[1] 陈辛 冯世强 杨仕聪 YANG Yong;ZHANG Shuchen;CHEN Xin;FENG Shiqiang;YANG Shicong(School of Civil Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,China;Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education,Xi′an 710055,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]结构工程与抗震教育部重点实验室,陕西西安710055

出　　处：《哈尔滨工程大学学报》2024年第6期1076-1084,共9页Journal of Harbin Engineering University

基　　金：陕西省自然科学基础研究计划(2019JC-30);国家自然科学基金面上项目(51978565)。

摘　　要：传统螺栓连接件的直径小于钢梁预留孔的孔径,导致螺栓与孔壁存在间隙,容易引发钢梁与上部混凝土板间发生相对滑移使组合梁挠度增大。为尽量减小或消除上述间隙,本文引入铰制孔螺栓和螺纹孔螺栓作为组合结构的剪力连接件,并提出锥套自锁螺栓连接件。设计并开展了8个螺栓连接件推出试验,基于各试件的荷载-滑移曲线,研究了3种螺栓连接件与传统螺栓连接件间的抗剪承载力、滑移能力及抗剪刚度等受剪力学性能的具体差异。研究结果表明:3种螺栓连接件的破坏形态与传统螺栓连接件表现一致,均为螺栓杆剪断,混凝土无压溃现象;3种螺栓连接件的抗剪承载力均接近于传统螺栓连接件的抗剪承载力;基于试件的荷载-滑移曲线,3种螺栓连接件均可分为弹性阶段、塑性阶段及破坏阶段;3种螺栓连接件的延性系数和抗剪刚度均明显优于传统螺栓。综合考虑力学性能、施工性能和经济性,本文建议选用铰制孔螺栓用于组合结构的剪力连接件。The diameter of a traditional bolt connector is smaller than that of the predrilled holes in a steel beam,resulting in a gap between the bolt and the hole wall,possibly causing a relative slip between the steel beam and the concrete slab on the top,thereby increasing the deflection of the combined beams.To minimize or eliminate the above mentioned gaps,the reamer and threaded hole bolts are introduced as the shear connectors of composite structures,and the cone sleeve self-lock bolt connectors are proposed.Eight push-out tests were designed and implemented on the bolt connectors.According to the load-slip curve of each specimen,the specific differences in shear mechanical properties,such as shear-bearing capacity,slip capacity,and shear stiffness between three types of bolt connectors and traditional bolt connectors,were studied,showing that the failure modes of the three bolt connector types are consistent with those of the traditional bolt connectors.These failure modes are the shear failure of the bolt rod,and the concrete around the bolt has no peeling phenomenon.All three bolt connectors are similar to traditional bolt connectors in terms of shear-bearing capacity.According to the load-slip curve of the specimen,these three bolt connectors can be divided into elastic,elastic-plastic,and failure stages.The ductility coefficient and shear stiffness of the three bolt connectors are better than those of the traditional bolts.Considering the mechanical properties,construction performance,and economy,reamed bolt connectors should be used as the shear connectors of composite structures.

关 键 词：钢-混凝土组合梁 螺栓连接件 抗剪性能 推出试验 施工性能 抗剪承载力 抗剪刚度 滑移 

分 类 号：TU398[建筑科学—结构工程] TU317.1