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通过2个不同纵向加劲肋间距的聚氨酯-钢板夹层结构正交异性三跨连续桥面板的钢箱梁模型试验,结合有限元计算分析方法建立多种加劲肋间距桥面板的钢箱梁计算模型进行计算对比,研究该种桥面板的受力性能,试验模型按实桥同种材料的箱梁缩小1/4制作,按汽车荷载在跨中及支点截面产生最大弯矩时测试截面各关键点的纵向、横向应变和挠度。结果表明:桥面板各点应变试验值与计算值基本吻合;采用聚氨酯-钢板夹层结构正交异性桥面板可大幅削减局部应力集中峰值,从而可大幅减少加劲肋数量,减少程度主要取决于夹层板厚度;板面有些部位要同时承受两个正交方向的反号应力;相应截面中间加劲肋底部纵向应力最大;夹层桥面板的应力和挠度随着芯层厚度减小,增幅加大。
Through the steel box girder model test of two different longitudinal stiffener spacing of polyurethane - steel sandwich structure orthotropic three-span continuous deck, combined with finite element analysis method to establish a variety of stiffener spacing bridge deck steel box girder calculation model Comparing and studying the mechanical properties of the bridge deck, the test model is made according to the reduction of 1/4 of the box girder of the same material of the actual bridge. When the maximum bending moment occurs in the mid-span and the fulcrum section according to the automobile load, the key points Longitudinal, transverse strain and deflection. The results show that the values of strain at each point of bridge deck plate are in good agreement with the calculated ones. The peak value of local stress concentration can be greatly reduced by using polyurethane - steel sandwich orthotropic bridge deck plate, which can greatly reduce the number of stiffeners. The degree of reduction mainly depends on the sandwich plate Thickness; some parts of the plate to bear the same time, the two anti-sign stress in the orthogonal direction; the middle of the corresponding cross-section stiffener at the bottom of the maximum longitudinal stress; sandwich bridge deck stress and deflection with the core thickness decreases, increasing.