钢-RPC轻型组合桥面结构湿接头弯曲试验
发布时间：2018-09-10 14:29
【摘要】：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。
[Abstract]:In order to improve the mechanical properties and crack resistance of wet joints of lightweight composite bridge deck structures with orthotropic steel plate -RPC (Reactive Powder Concrete, reactive powder concrete, the steel fibers at the joints of RPC layer are discontinuous. The tensile strength of RPC at joint is much lower than that of continuous pouring. The bending test of RPC wet joint is carried out. Two test beams were designed and fabricated, including 5 wet joints of infilled steel bars, 3 wet joints of special-shaped steel plates and 1 wet joint of welded steel mesh. The load-deformation curve and the RPC nominal tensile stress-maximum crack width curve of each test beam are compared. The reinforcement ratio of infilled steel bar and the angle of shaped steel plate opening are analyzed. The crack resistance of different wet joints is influenced by the welding form of steel bar. The results show that the higher the reinforcement ratio is, the better the crack resistance of wet joint is, and the cracking stress of RPC is the highest when the angle of shaped steel plate is 66 掳, which is higher than that of wet joint of infilled steel bar and wet joint of conventional steel bar. The wet joints of profiled steel plate and welded steel mesh have better mechanical properties and crack resistance, and the crack resistance of wet joints welded on steel plate is better than that of wet joints without welding on steel plates. The RPC allowable cracking stress of the wet joint of profiled steel plate and welded steel mesh wet joint considering durability is 26. 5 ~ 25. 1 MPa respectively according to the test results, which can meet the requirements of crack resistance of RPC bridge slab under the action of vehicle load.
【作者单位】： 湖南大学土木工程学院;湖南工业大学土木工程学院;重庆大学土木工程学院;
【基金】：国家自然科学基金项目(51378194) 湖南省科技厅科技计划重点项目(2012FJ2007) 交通运输部重大科技专项项目(2011318494160)
【分类号】：U446.1
本文编号：2234720
[Abstract]:In order to improve the mechanical properties and crack resistance of wet joints of lightweight composite bridge deck structures with orthotropic steel plate -RPC (Reactive Powder Concrete, reactive powder concrete, the steel fibers at the joints of RPC layer are discontinuous. The tensile strength of RPC at joint is much lower than that of continuous pouring. The bending test of RPC wet joint is carried out. Two test beams were designed and fabricated, including 5 wet joints of infilled steel bars, 3 wet joints of special-shaped steel plates and 1 wet joint of welded steel mesh. The load-deformation curve and the RPC nominal tensile stress-maximum crack width curve of each test beam are compared. The reinforcement ratio of infilled steel bar and the angle of shaped steel plate opening are analyzed. The crack resistance of different wet joints is influenced by the welding form of steel bar. The results show that the higher the reinforcement ratio is, the better the crack resistance of wet joint is, and the cracking stress of RPC is the highest when the angle of shaped steel plate is 66 掳, which is higher than that of wet joint of infilled steel bar and wet joint of conventional steel bar. The wet joints of profiled steel plate and welded steel mesh have better mechanical properties and crack resistance, and the crack resistance of wet joints welded on steel plate is better than that of wet joints without welding on steel plates. The RPC allowable cracking stress of the wet joint of profiled steel plate and welded steel mesh wet joint considering durability is 26. 5 ~ 25. 1 MPa respectively according to the test results, which can meet the requirements of crack resistance of RPC bridge slab under the action of vehicle load.
【作者单位】： 湖南大学土木工程学院;湖南工业大学土木工程学院;重庆大学土木工程学院;
【基金】：国家自然科学基金项目(51378194) 湖南省科技厅科技计划重点项目(2012FJ2007) 交通运输部重大科技专项项目(2011318494160)
【分类号】：U446.1
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