T形肋正交异性组合桥面板力学性能

Performance of the Composite Bridge Deck with Concrete Slab and Orthotropic Steel Plate with T-shape Stiffener

为了检验所提出的T形肋正交异性组合桥面板在局部车轮荷载作用下的受力特性及这种桥面板在桥梁第二体系中的受力性能,并区分其与常规桥面板的受力性能,设计制作了4个不同桥面板试件,其中包括一个混凝土桥面板,一个正交异性钢桥面板,两个不同尺寸的T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T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,相同宽度的T形肋正交异性组合桥面板其极限抗弯承载力分别是混凝土桥面板和钢桥面板的2.30倍和1.57倍以上,表明T形肋正交异性组合桥面板具有较强的抗疲劳性能.

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,4 different types of bridge deck are designed and fabricated,one is concrete bridge deck,one is orthotropic steel bridge deck,and the other two are composite bridge decks with concrete slab and orthotropic steel plate with T-shape stiffener in different sizes.Static load test is conducted on these specimens to shed light on the cracking 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 is less than that of the orthotropic steel bridge deck,the load-carrying capacity of the composite bridge deck in unit width is at least2.36 and 1.57 times as many as that of the concrete deck and orthotropic steel plate deck,respectively, which,further validate that the composite bridge deck proposed in this paper has a higher fatigue strength.