正交异性钢板-混凝土连续组合桥面板抗弯性能分析

Analysis on flexural behavior of orthotropic steel-concrete continuous composite decks

为探讨不同类型加劲肋构造对正交异性钢板-混凝土连续组合桥面板抗弯性能的影响,通过试验和数值模拟方法分析比较了平钢板-混凝土连续组合桥面板(SCCCDs)、带一字肋的正交异性钢板-混凝土连续组合桥面板(OSCCCDs)和带U形加劲肋的正交异性钢板-混凝土连续组合桥面板(USCCCDs)等3种组合桥面板抗弯性能的异同点,研究了加劲肋数量、加劲肋厚度、钢板厚度、混凝土厚度、配筋率和PBL剪力连接件间距等参数对抗弯性能的影响.结果表明,3种类型钢板-混凝土连续组合桥面板的抗弯刚度和极限承载能力存在显著差异.相比于SCCCDs, OSCCCDs和USCCCDs的极限荷载分别提高了23.1%和74.5%.混凝土板厚度对连续组合桥面板的抗弯性能影响最大,对抗弯刚度和极限承载力的影响率分别为15.70%和22.44%.

To investigate the effects of different types of ribs on the flexural behavior of orthotropic steel-concrete continuous composite decks,the flexural behaviors of steel-concrete continuous composite decks(SCCCDs),open-rib stiffened steel-concrete continuous composite decks(OSCCCDs),and U-rib stiffened steel-concrete continuous composite decks(USCCCDs)were analyzed and compared by the flexural tests and numerical simulation.The effects of the number of ribs,the thickness of the ribs,the thickness of the steel plate,the thickness of the concrete slab,the reinforcement ratio,and the spacing of the PBL shear connectors on the flexural behaviors were studied.The results show that there are significant differences in the flexural stiffness and ultimate bearing capacity of the three types of steel-concrete continuous composite decks.Compared with SCCCDs,the ultimate loads of OSCCCDs and USCCCDs are increased by 23.1%and 74.5%,respectively.The thickness of concrete slab has the highest impact on of the flexural behavior of continuous composite decks,and its influence ratios on flexural stiffness and ultimate bearing capacity are 15.70%and 22.44%,respectively.