U形肋正交异性组合桥面板力学性能

为验证桥面板在局部车轮荷载作用下的受力特性及桥面板在桥梁第二体系中的受力性能,提出新型U形肋正交异性组合桥面板系统,并区分其与常规桥面板的受力性能.设计制作了3个不同桥面板试件,其中包括1个混凝土桥面板,1个正交异性钢桥面板,1个带U形肋正交异性组合桥面板.通过静力试验测试了不同桥面板在荷载作用下负弯矩区混凝土开裂情况、桥面板不同部位的结构应变和变形等.试验结果表明:U形肋正交异性组合桥面板在车轮荷载作用下其局部应力水平显著低于正交异性钢桥面板,具有较强的抗疲劳性能;U形肋正交异性组合板在桥梁第二体系的承载能力分别是混凝土桥面板和钢桥面板的1.37倍和0.93倍.

Performance of the orthotropic composite bridge deck with U-shape stiffener

In order to check the performance of the new type of composite bridge deck proposed in this paper under the wheel load and its performance in the second system of the bridge deck, also to compare it with the performance of the normal bridge deck, 3 different types of bridge deck are designed and fabricated. One is concrete bridge deck, another is orthotropic steel bridge deck, and another is composite bridge deck with concrete slab and orthotropic steel plate with U-shape stiffener. Static load test is conducted on these specimens to reveal the cracking behavior of concrete in the negative moment zone and measure the deformation and the strains in different locations on the decks. The result proves that the local stress level of the composite bridge deck burdened the vehicle load is lower than that of the orthotropic steel bridge deck. The composite bridge deck has a high fatigue strength and wheel-load resisting strength. The bearing capacity of orthotropic composite deck in the second system of the bridge deck is 1.37 times and 0.93 times of that of the concrete deck and orthotropic deck respectively.