球扁钢肋组合桥面板局部与整体力学性能

Local and Integral Mechanical Properties of Composite Bridge Deck with Bulb Flat Ribs

摘要:

为了检验所提出的球扁钢肋组合桥面板在桥梁中使用的受力性能，设计制作了2个带球扁钢肋组合桥面板试件和1个正交异性钢桥面板试件.通过静力试验，测试桥面板不同部位的结构应变和变形，考察了球扁钢肋组合桥面板在车轮荷载作用下的局部受力性能，以及在正、负弯矩作用下的整体受力性能.试验结果表明：在车轮荷载作用下球扁钢肋组合桥面板的疲劳细节处应力水平非常小，大大降低了桥面板钢结构发生疲劳破坏的可能性；试件截面应变沿高度的分布符合平截面假定，在受弯破坏极限状态下，混凝土与钢板之间无明显滑移和脱层，球扁钢组合桥面板的钢板与混凝土之间组合作用良好；该种组合板具有良好的延性，并有较高的承载能力.

关键词:组合桥面板; 球扁钢肋; 静力试验; 正交异性板; 受力性能

Abstract:

In order to study the mechanical properties of the proposed composite bridge deck with bulb flat ribs in bridge service, two composite bridge decks with bulb flat ribs and one orthotropic steel bridge deck are designed and fabricated. With the measurement of the deformation and the strain in different locations through a static experiment, local mechanical properties under wheel load and integral mechanical properties under negative and positive moment load are both tested. The results show that the local stress level of composite bridge deck with bulb flat ribs under wheel load is very low, which reduces the possibility of fatigue failure of steel bridge deck. Crosssection strain distribution along the height conforms to plane section assumption, and with no observation of obvious slippage or delamination on bending ultimate failure state. It could be concluded that the composite effect between steel and concrete is perfect. This type of composite deck has a good ductility and a high bearing capacity.

Key words:composite bridge deck; bulb flat rib; static experiment; orthotropic deck; mechanical properties