栓钉钢板企口预制混凝土梁端受力性能试验研究与设计方法  

Experimental study on mechanical performance of precast concrete beam with steel plate-stud hanger and design method

作　　者：吴智伟 张辉[1] 谢旺兰 李伟兴[2] 赵勇[1] WU Zhiwei;ZHANG Hui;XIE Wanglan;LI Weixing;ZHAO Yong(College of Civil Engineering,Tongji University,Shanghai 200092,China;Shanghai Tianhua Architectural Design Co.,Ltd,Shanghai 200235,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]上海天华建筑设计有限公司,上海200235

出　　处：《建筑结构学报》2021年第10期166-176,共11页Journal of Building Structures

基　　金：国家重点研发计划(2016YFC0701900);广西重点研发计划(AB17292060)。

摘　　要：栓钉钢板企口为钢板两侧焊接栓钉的一种钢质企口,可作为预制混凝土次梁端的铰接节点。为研究栓钉钢板企口预制混凝土梁端受力性能,进行了8个试件的静力加载试验,得到了栓钉钢板企口梁的破坏模式、挠度曲线、栓钉应变、钢筋应变及梁端剪切变形等试验结果,分析了最外侧栓钉距梁端距离C_(1)和梁端配筋构造对试件承载力及变形能力的影响,进一步分析了栓钉钢板企口梁端的传力机理,并提出了相关的设计方法。结果表明:试件的破坏模式有两种,分别为梁端剪撬或剪压破坏和钢板企口栓钉剪扭破坏;C_(1)为60 mm试件的梁端混凝土被撬开且破坏突然;C_(1)为100 mm试件的承载力平均比C_(1)为60 mm的试件提高27%,但C_(1)为210 mm试件的承载力却比C_(1)为100 mm的试件降低5%;梁端箍筋加密可提高试件承载力;可采用拉压杆模型计算栓钉钢板企口混凝土梁端的受剪承载力。建议将GB/T 51231—2016《装配式混凝土建筑技术标准》中的最外侧栓钉到梁端面的最大距离由200 mm调整为100 mm,且梁端优先采用C形筋的配筋形式。The steel plate-stud hanger is a kind of steel hanger with welded studs on both sides of the steel plate,which can be used as a kind of pin joint for the secondary precast concrete beam end.In order to study the mechanical performance of precast concrete beam end with steel plate-stud hanger,static loading tests of 8 specimens were carried out,and the failure mode,deflection curve,stud strain,reinforcement strain and shear deformation of the beam end were obtained.The influence of the distance C_(1) from the outermost stud to the beam end and the configuration of the reinforcement of the beam end on the bearing capacity and deformation capacity of the specimen were analyzed.Additionally,the force transmission mechanism of the beam end with the steel plate-stud hanger was further analyzed and the corresponding design method was also established.Results show that there are two failure modes of the specimen,namely the beam end concrete breakout/shear-compression failure and the steel plate-stud hanger shear-torsion failure.The beam end concrete with C_(1)=60 mm is pried and destroyed suddenly.The average bearing capacity of the specimens with C_(1)=100 mm is 27%higher than that of specimens with C_(1)=60 mm,but the bearing capacity of specimens with C_(1)=210 mm is 5%lower than that of specimens with C_(1)=100 mm.The densification of stirrups of beam end can increase the bearing capacity of specimens,and the strut-and-tie model can be used to determine the shearing capacity of the beam end with steel plate-stud hanger.It is recommended to adjust the maximum distance from the outermost stud to the end of the beam in GB/T 51231—2016“Technical standard for assembled buildings with concrete structure”from 200 mm to 100 mm,and C-shaped reinforcement is preferred at the beam end.

关 键 词：预制混凝土梁 铰接节点 栓钉钢板企口 梁端受力性能 拉压杆模型 

分 类 号：TU375.1[建筑科学—结构工程] TU317.1