基于平钢板连接件的钢-RPC组合桥面板抗剪试验研究

SHEAR-TEST RESEARCH ON SMOOTH-PLATE SHEAR-FORCE CONNECTOR OF STEEL AND RPC COMPOSITE DECK

该文提出了采用平钢板剪力连接件连接的钢-RPC组合桥面板结构,该结构不仅能解决公路钢桥沥青铺装层的病害,还能有效地提高桥面横向刚度,有助于缓解U肋加劲处应力集中和疲劳开裂现象。为了掌握该组合结构界面抗剪性能,连接件板厚分别取10 mm和4 mm,进行了两组平钢板连接件的推出试验,试验考察了平钢板连接件厚度对抗剪破坏形态及承载力的影响。结果表明:平钢板厚度较小时,表现为平钢板连接件根部受拉屈服;厚度较大时表现为连接件附近混凝土被压碎,工作机理类似于型钢连接件。10 mm板厚连接件相比4 mm板厚抗剪承载力提高了43.6%,抗剪刚度提高了35%,同时延性略有下降,但两组试件的延性系数均大于3.5。最后给出了平钢板连接件的抗剪承载力简化计算公式,计算结果相比试验结果偏于安全,可供设计参考。

This paper puts forward a kind of steel-RPC composite deck with a smooth-plate shear-force connector. The structure can not only solve asphalt pavement＇s disease of a steel bridge, but also can improve the deck＇s lateral stiffness, being help for easing the stress concentration and fatigue cracking at the place of U rib stiffeners. Based on this structure, a push-out test for smooth-plate shear-force connectors was conducted. 6 specimens were divided into two groups by the connectors＇ thickness of 4mm and 10mm. The test inspected the thickness＇s impact on shear bearing capacity and failure mode. The results show that the root of the connector will be yielded in tension when the connector is thin, that RPC under the connector is crushed when the connector is thick, and that the working mechanism is similar to that of steel fittings. Comparing a 10mm thickness connector with a 4mm thickness one, the bearing capacity is improved 43.6%, the stiffness of shear is improved 35%, and ductility decreased slightly, but two sets of test piece＇s ductility factor are both greater than 3.5. Finally, a simplified formula for smooth-plate shear-force connector＇s shear bearing-capacity is given, and the calculation result is more secure than test results, which can provide a reference for the design.