宽幅独柱墩桥梁抗倾覆精细化验算及加固方案研究

Research on Refined Checking Calculation and Reinforcement of Anti-overturning of Wide Single-column Pier Bridge

独柱墩桥梁因车辆超载和偏载出现倾覆事故时有发生,既有独柱墩桥梁结构验算与专项加固成为研究热点,相较于常规独柱墩匝道桥,宽幅独柱墩桥梁抗倾覆安全性更低、验算准确性要求更高。以某大半径宽幅曲线独柱墩桥梁工程为例,分别建立了单梁模型、折面梁格模型和三维实体模型,对比研究了该桥梁在结构自重以及偏载作用下的横向支座反力分布情况,并筛选出折面梁格模型进行抗倾覆精细化验算。针对该桥梁抗倾覆稳定性不足的问题,提出了多个加固方案并进行了对比分析,得出了适合该桥的加固方案。研究结论对类似桥梁抗倾覆验算以及加固方案设计具有一定的参考价值。

The overturning accidents of single-column pier bridges have occurred frequently due to vehicle overload and partial load.The structural checking calculation and special reinforcement of existing single-column pier bridges have become research hotspots.Compared with conventional single-column pier ramp bridges,wide ones have lower anti-overturning safety and higher checking accuracy requirements.In this paper,a single-column pier bridge with large radius and wide curves is taken as an engineering example.The single beam model,folded beam grillage model and 3D solid model are established respectively.The distribution of transverse bearing reaction force of the bridge under self-weight and eccentric load is compared and studied to selected the folded beam grillage model for antioverturning fine checking calculation.Aiming at the problem of insufficient anti-overturning stability of the bridge,several reinforcement schemes are proposed and compared to obtain the reinforcement scheme suitable for the bridge.The research conclusions have reference value for anti-overturning checking calculation and reinforcement scheme design of similar bridges.