基于新规范的独柱墩曲线梁桥抗倾覆稳定性分析

Analysis of Overturning Stability of Curved Girder Bridge with Single Column Pier Based on New Specification

利用新规范的简化算法计算了大半径或直线独柱墩梁桥的横向抗倾覆稳定性,与精细化有限元计算的结果对比表明,新规范具有较好的适用性,不会高估大半径曲线梁桥的抗倾覆能力。以上海市某高速立交6联独柱墩连续箱梁匝道为例,计算了基础变位、温度梯度对于独柱墩抗倾覆稳定性的影响,同时分析了在役独柱墩曲线梁桥的特点,提出在进行抗倾覆性能验算时,应结合现场桥梁的状态和几何现状对模型进行修改。对上海地区该类桥梁的抗倾覆验算有一定的借鉴意义。

This paper used the simplified algorithm of the new specification to calculate the lateral overturning stability of large-radius or straight single-column pier-girder bridges at first.The comparison with the results of refined finite element calculations showed that the new code had good applicability and would not overestimate the overturning resistance of large-radius curved beam bridges.Taking the continuous box-girder ramp of a 6-span single-column pier of a freeway interchange in Shanghai as an example,this paper calculated the influence of foundation displacement and temperature gradient on the overturning stability of single-column piers,and analyzed the characteristics of the in-service single-column curved beam bridge.This paper proposed that the model should be modified based on the status and geometric status of the bridge.This paper provided reference for the overturning inspections of such bridges in Shanghai.