独柱墩连续箱梁桥抗倾覆验算和加固设计

以南昌市某一立交桥的B匝道为例,通过建立有限元模型对其进行了抗倾覆稳定验算及加固设计。研究了将中墩单点支承改为多点支承加固方法中加固桥墩个数、新增支座与原支座间距对桥梁抗倾覆稳定性及中墩受力的影响。最后,综合加固效果及加固费用的考虑,提出了可靠的抗倾覆加固的方案,可为同类型的独柱墩桥梁抗倾覆加固设计提供参考。

Anti-overturning Checking Calculation and Reinforcement Design of Single-pier Continuous Box Girder Bridge

Taking B Ramp of an interchange in Nanchang as an example,the anti-overturning stability checking calculation and reinforcement design are carried out for it through the establishment of finite element model.The influence of the space between the reinforced pier number,newly increased support and original support on the anti-overturning stability of bridge and the stress of middle pier in the reinforcement method of changing the single-point support of middle pier into the multi-point support is studied.Finally,comprehensively considering the reinforcement effect and reinforcement cost,the reliable anti-overturning reinforcement scheme is proposed.The reference can be provided for the anti-overturning reinforcement design of the similar single-pier bridges.