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采用模型试验及空间有限元计算分析方法研究聚氨酯-钢板夹层结构正交异性三跨连续桥面板的力学特性,并对比了不同桥面板车轮作用点处,截面受局部应力影响的纵横向应力分布。结果表明:与普通正交异性钢桥面板相比,夹层桥面板能大幅降低局部应力集中,应力峰值约为普通正交异性钢桥面板的1/3～1/2,并可大幅减少焊缝疲劳裂纹的出现;由于夹层板自身刚度大幅提高,能大幅减少纵向加劲肋数量并减少50%以上的焊缝,从而节省钢材,减轻自重;聚氨酯-钢板夹层结构正交异性桥面板的应变试验测试值与有限元计算值基本吻合。
The mechanical properties of the polyurethane-steel sandwich structure with three-span continuous slab are studied by means of the model test and the finite element analysis method. The longitudinal and transverse stress distribution of the cross-section under the influence of local stress is compared with that of the bridge deck. The results show that compared with ordinary orthotropic steel bridge deck, the sandwich bridge can greatly reduce the local stress concentration, and the stress peak value is about 1/3 to 1/2 of the normal orthotropic steel bridge deck, and the weld joint can be greatly reduced The appearance of fatigue cracks; Due to the substantial increase in the rigidity of the sandwich plate itself, the number of longitudinal stiffeners can be greatly reduced and more than 50% of the weld can be reduced, thereby saving the steel and reducing the weight. The strain test of the polyurethane-steel sandwich structure orthotropic bridge deck The values are in good agreement with the calculated values of finite element.