箱肋拱桥的加固方法研究及分析

某箱肋拱桥主拱圈出现了大量的裂缝,荷载试验结果表明结构刚度偏低、冲击系数偏大。为了解决以上问题,通过增设拱肋之间的斜撑以增强横向联系,加强结构的整体性,并结合空间梁格有限元模型分析对比了加固前后的拱圈内力变化情况。结果表明,增设斜撑后,活载内力将下降20%左右,效果明显。

Research and Analysis of Reinforced Method for Box Ribbed Arch Bridge

Many cracks appear in a deck type box arch bridge,and the load test reveals that the rigidity is a little lower and dynamic response coefficient is a little higher for the bridge.A reinforced method of setting cross bracing between arches was suggested in order to enhance the transverse rigidity and structural integrality.The internal forces were analyzed pre and after reinforcement with the spatial grillage method.The analytical results reveal that about 20 percents of internal forces under the action of live load are reduced after cross bracing placed.The effect is obviously.This technique can be used in the same kind of bridges.