钢-薄层RPC组合桥面结构栓钉的抗剪性能  

Shear Behavior of Studs of Composite Deck System Composed of Steel and Ultra-thin RPC Layer

作　　者：邵旭东[1] 周环宇[1] 曹君辉[1] 

机构地区：[1]湖南大学桥梁工程研究所,湖南长沙410082

出　　处：《公路交通科技》2013年第4期34-39,64,共7页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51178177);交通运输部西部交通建设科技项目(2011318494160)

摘　　要：为研究钢-薄层RPC组合桥面结构栓钉受力性能,建立了有限元模型,对钢-RPC组合结构中短栓钉的应力场及荷载-滑移曲线进行理论分析。开展了推出试验,实测了栓钉的荷载-滑移曲线,并得到了栓钉的极限承载力。研究结果表明,由于RPC自身抗压强度能达到80 MPa,其远大于普通混凝土的极限抗压强度(C50屈服强度为32.4 MPa),故钢-RPC组合桥面结构中层间剪力将导致栓钉被剪坏,而RPC层并无损坏,其单个栓钉抗剪承载力较采用普通混凝土浇注的推出试件(混凝土被局部压碎导致破坏)中栓钉承载力提高了42%。具体研究了钢-RPC组合桥面结构中短栓钉的抗剪性能,指出短栓钉承载力同直径2次方成线性比例,而栓钉长度对承载力几乎无影响。最后提出了短栓钉承载力计算公式,为设计提供依据。In order to research the mechanical property of studs of composite deck system composed of steel and ultra-thin RPC layer, we established a finite element model, analysed the stress field of short studs in stecl-RPC composite structures and the load-slip curve. We also performed a push-out experiment, measured the values of the stud＇s load-slip curve and obtained the stud＇s ultimate bearing capacity. The results show that due to the compressive strength of RPC itself can reach 80 Mpa, which is much larger than the ultimate compressive strength of ordinary concrete （ the yield strength of C50＇ is 32. 4 MPa） , the interfacial shearing force between steel and RPC layer led to the studs being sheared off while the RPC layer kept fine, the stud＇s ultimate bearing capacity increased by 42% compared with that of the push-out sample poured by common concrete （concrete partial crushing led to destruction）. In addition, we studied the shear behavior of the short studs in steel-RPC composite bridge structure, and pointed out that the bearing capacity of the short stud is linearly proportional to d2, while the length of stud has no effect on the bearing capacity. Finally, we proposed a calculation formula of the bearing capacity of short stud to provide a basis for design.

关 键 词：桥梁工程 组合梁 栓钉 推出试验 RPC 界面抗剪 荷载-滑移曲线 

分 类 号：U445.581[建筑科学—桥梁与隧道工程]