小半径人行桥倾覆稳定性设计与分析

本文采用定量比较方法,改变小半径人行桥的曲线半径或者支座间距大小的同时,控制其他因素不变,从而分析出曲线半径和支座间距对抗倾覆系数的具体影响。结果表明:在小半径人行桥中,曲线半径或者支座间距的增大使得桥梁的倾覆系数有所改善;在使用小半径曲线桥梁时,若抗倾覆不通过,采用墩梁固结的方法改善桥梁的倾覆问题,且发现边跨的内力有所改善,中跨的内力有所增加,对于墩顶由于刚度的整体提升,墩顶负弯矩在整体上表现为增大,设计人员应着重考虑边中跨及墩顶的配筋优化。研究结果为小半径人行景观桥的设计提供了一定参考价值。

Design and Analysis of Capsizing Stability of Small Radius Footbridge

In this paper,method of quantitative comparison was applied to analyse the influence of the radius of the curve and the distance between the supports against the overturning coefficient by changing the radius of the curve and the distance between the supports and controlling other factors constant.The results showed that,in a small radius footbridge,the overturning coefficient is improved by increasing the radius of the curve or the distance between the supports.If the anti-overturning of the bridge with small radius curve is not satisfying,the pier beam consolidation is adopted to improve the anti-overturning,and it is found that the internal force of the side span is improved,and the internal force of the middle span is increased.Due to the overall increase of stiffness,the negative bending moment at the top of the pier increases on the whole,so the designers should pay more attention to the reinforcement optimization of the middle span and the top of the pier.The research results provide some reference value for the design of small radius pedestrian bridge.