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利用有限元对小花沟连续刚构桥最高墩的3种桥墩设计方案进行了稳定分析,所用的3种墩身方案分别为:上部为双薄壁、下部为单薄壁空心墩的组合式桥墩;单薄壁空心墩且左右幅桥墩间设置2道横撑;单薄壁空心墩且左右幅桥墩间仅设置一道横撑。分析中考虑几何非线性和材料非线性对稳定性的影响。结果表明,在上部构造及墩高不变的情况下,上部为双薄壁、下部为单薄壁空心墩的组合式桥墩的稳定性好于单薄壁空心墩。而单薄壁空心墩通过合理设置横撑,将有助于增强两薄壁间的联系,提高桥墩的稳定性。
The stability analysis of three kinds of piers of the pier with the highest pier in the continuous rigid frame bridge of Xiaoguagou is carried out by using the finite element method. The three kinds of piers used are as follows: the combined piers with double thin walls in the upper part and single thin-walled hollow pier in the lower part ; Single-thin-walled hollow pier and the left and right bridge Pier between the two cross-bracing; single-thin-walled hollow pier and left and right bridge pier only set a cross brace. The analysis considers the influence of geometric nonlinearity and material nonlinearity on stability. The results show that the stability of the composite piers with single-walled thin-walled hollow piers is better than the single thin-walled hollow piers under the condition of the upper structure and pier height. The single thin-walled hollow pier through the reasonable set of bracing will help to enhance the contact between the two thin-walled and improve the stability of piers.