简支正交异性夹层桥面板稳定性能分析

Stability Analysis of Orthotropic Sandwich Bridge Deck with Simply Supported

采用实验和数值计算方法,研究了简支正交异性钢板-聚氨酯夹层桥面板的稳定性能.通过弹性稳定计算研究了该种桥面板几种参数变化对前4阶屈曲模态的影响,以及考虑材料及几何非线性稳定计算对临界荷载的影响.结果表明:夹层桥面板处于受压状态时,车轮作用对顶、底面钢板应力的影响程度会有较大差别;芯层厚度、纵向加劲肋间距、钢面板厚度3个参数中,前两个参数对桥面板的稳定性能影响较大;设计时建议先设定合理的夹层板厚度,再通过试算选择纵向加劲肋间距,工作量会较少.

The stable performance of the orthotropic bridge deck with simply supported,made from steel-polyurethane sandwich plate,was studied by means of experiments and the numerical calculation method.The impact of several parameter changes of the bridge deck on the first four order buckling modes was analyzed through the calculation of elastic stability,and the impact of material nonlinearity and geo-metric nonlinearity of structure on the critical load was also analyzed.The results have shown that,when sandwich bridge deck is in a state of compression,the influence degree of the wheel effect on the top and bottom steel plate stress will be quite different,and that,among the three parameters,i.e.the core layer thickness,the longitudinal stiffener spacing and steel plate thickness,the first two parameters have a grea-ter influence on the stability of the bridge deck.When designing the orthotropic sandwich bridge deck,it is recommended to set a reasonable thickness of sandwich plate at first,then to choose the longitudinal stiff-ener spacing by trying to calculation in order to reduce the workload.