加劲肋对混凝土箱梁悬臂板力学性能影响

INFLUENCE OF STIFFENERS ON MECHANICAL PROPERTIES OF CANTILEVER PLATES OF CONCRETE BOX GIRDER

随着交通流量的日益增多,拓宽桥面板的宽度是解决行车难的方法之一。对于宽体箱梁桥,通过在箱梁悬臂板下设置横向加劲肋,可以显著提高箱梁的横向抗弯刚度,从而减小悬臂板根部截面的应力。利用有限元软件Abaqus,对加劲式宽箱梁悬臂板根部的力学性能进行了分析,研究了加劲肋的宽度、高度、间距等因素对其力学性能的影响。研究结果显示,加劲肋的宽度、高度、间距对于混凝土板悬臂根部横向应力的影响程度不同,高度的影响最大,宽度的影响最小。因此在进行截面设计时,应优先通过改变加劲肋的高度来调整结构设计。

With the increase of traffic flow,the width widening of the bridge deck is one of the ways to solve the difficulty of driving.For wide-body box girder bridges,the lateral bending stiffness of the box girder can be significantly improved by providing transverse stiffeners under the cantilever plates of the box girder,thereby reducing the stress on the root section of the cantilever plate.In this paper,the mechanical properties of the cantilever plate of the stiffened wide box girder are analyzed by the finite element software abaqus.The effects of the width,height,and spacing of the stiffener on the mechanical properties are studied.The results show that the width,height,and spacing of the stiffeners have different degrees of influence on the lateral stress of the cantilever root of the concrete slab.Therefore,it is preferred to adjust the structural design by changing the height of the stiffener.