开口U形肋组合桥面板基本力学性能

Test on the Mechanical behavior of the orthotropic composite bridge deck with U-shape stiffenerPerformance of the orthotropic composite bridge deck with U-shape stiffener

摘要:

为了检验本文所提出的开口U形肋组合桥面板在桥梁中使用的受力性能,并区分其与常规桥面板的受力性能,设计制作了3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,一个带U形肋组合桥面板。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、极限承载力等。试验结果表明：在车轮荷载作用下开口U形肋组合桥面板的应力水平远远低于正交异性钢桥面板的,避免了桥面板钢结构疲劳的发生；在重量比混凝土桥面板轻57%的情况下,组合桥面板的承载力是混凝土桥面板的1.42倍；在用钢量约为钢桥面板一半的情况下,二者的承载力相当。

关键词:组合桥面板; U形肋;正交异性;受力性能;试验

Abstract:

In order to check the performance of the new type of composite bridge deck proposed in this paper under the wheel load and test its performance in the second system of the bridge deck, and also to compare it with the performance of the common bridge deck, 3 different types of bridge deck are designed and fabricated. One is concrete bridge deck, another is orthotropic steel bridge deck, and the third is composite bridge deck with concrete slab and orthotropic steel plate with U-shape stiffener. Static load test is conducted on these specimens to investigate 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 acted by 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 1.42 times and 0.97 times that of the concrete deck and orthotropic deck respectively. The bearing capacity of composite is almost equal to that of orthotropic steel bridge deck with half the amount of steel.

Key words:composite bridge; orthotropic deck; U-shape stiffener; mechanical behavior; experiment