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为了提升正交异性钢板-RPC(Reactive Powder Concrete,活性粉末混凝土)轻型组合桥面结构湿接头的力学性能和抗裂性能,针对分次浇筑的RPC层接缝处钢纤维不连续,接缝处RPC的抗拉强度远低于连续浇筑部位等问题,进行了RPC湿接头弯曲试验研究。设计制作了2片试验梁,其中包括5种加密钢筋湿接头和3种异形钢板湿接头以及1种焊接钢筋网湿接头形式。比较了每片试验梁的荷载-变形曲线和RPC名义拉应力-最大裂缝宽度曲线,分析了加密钢筋配筋率、异形钢板企口角度、钢筋焊接形式等因素影响下不同湿接头形式的抗裂性能。研究结果表明:加密钢筋配筋率越高,湿接头抗裂性能相应越好;异形钢板企口角度为66°时,RPC开裂应力最高;与加密钢筋湿接头和常规湿接头相比,异形钢板湿接头和焊接钢筋网湿接头具有更好的力学性能和抗裂性能;加密钢筋焊接在钢板上的湿接头抗裂性能显著优于不焊接在钢板上的湿接头抗裂性能;异形钢板湿接头和焊接钢筋网湿接头考虑耐久性的RPC允许开裂应力根据测试结果分别为26.5,25.1MPa,能够满足RPC桥面板在车辆荷载作用下的抗裂强度要求。
In order to improve the mechanical properties and crack resistance of lightweight composite decks with wet reactive joints (RPC), the steel fibers at the joints of RPC layers are not continuous, RPC tensile strength is much lower than the continuous pouring parts and other issues, the RPC wet joint bending test. Two test beams were designed and manufactured, including five kinds of reinforced wet joints and three kinds of deformed steel wet joints and one kind of welded steel mesh wet joints. The load-deformation curve and the nominal tensile stress-maximum crack width curve of each test beam were compared. Crack resistance in different wet joints under the influence of factors such as the ratio of reinforcement reinforcement reinforcement, profiled steel plate tongue, performance. The results show that the higher the reinforcement ratio of reinforced steel, the better the crack resistance of wet joint is. The cracking stress of RPC is the highest when the angle of mouth of profiled steel is 66 °. Compared with the wetted joints of reinforced concrete and conventional wet joints, Wet joints and welded steel mesh wetting joint has better mechanical properties and crack resistance; wet steel joints welded steel reinforcement crack resistance was significantly better than the welded joints on the wet joint cracking resistance; shaped steel wet joints And welded steel mesh Wetted joints Considering the durability of the RPC allows cracking stress according to the test results were 26.5,25.1MPa, to meet the requirements of RPC deck under the vehicle load cracking strength.