夹心钢板系统加固正交异性钢桥面板的性能分析

正交异性钢桥面板广泛应用在现代钢桥中，但在车辆荷载作用下，由于较高的应力集中易引起关键焊接部位的疲劳裂纹，采用夹心钢板系统（SPS）对正交异性钢桥面板进行加固。通过ANSYS软件建立了正交异性钢桥面板及其SPS加固层的三维有限元模型，在不同的荷载工况下，分析了按我国现行规范规定的车辆荷载的两个后轴共同作用下桥面板的应力分布特征，并与加固前的应力状态进行了对比。结果表明：骑U肋加载在桥面板时U肋焊接处产生的横桥向应力最大；采用SPS对正交异性钢桥面板进行加固的效果良好，与加固前相比，可较大幅度地降低钢桥面板的应力，更有助于抵抗钢桥面板疲劳裂纹的产生。

Behavior Analysis of Orthotropic Steel Bridge Decks Strengthened by SPS

Orthotropic steel bridge decks are widely used in modem steel bridges, but under the wheel loading, fatigue cracks are prone to happen at typical deck weld joints due to the much higher stress concentration. In this paper, the orthotropic steel bridge deck is strengthened by the sandwich plate system （SPS）. Three-dimensional finite element model of orthotropic steel bridge deck and its＇ strengthening SPS layer is established by ANSYS software, and the stress characteristics due to the combined action of two wheel loads of the vehicle de- fined in China current code are analyzed under different load conditions, and are compared with those of before strengthened. The results show that the largest transverse stresses of bridge deck and U rib are generated when the distributed load riding through U ribs. The behaviors of orthotropie steel bridge deck are much better after strengthened by SPS compared with those before strengthened, with the stress of deck decreased obviously, and can better resist the fatigue cracks of orthotropie steel bridge decks.