无支座连续刚构桥双肢墩设计参数分析

Analysis on Design Parameter of Double-limb Pier of No-support Continuous Rigid-frame Bridge

摘要:

无支座连续刚构桥是一种较为新颖的桥梁结构形式。以某城市轨道交通工程中的双肢薄壁墩无支座连续刚构桥为例，通过建立有限元模型，开展了双肢墩设计参数分析。结果表明，主梁及桩基的主要验算指标对双肢墩设计参数的变化不敏感；合成刚度对双肢墩设计参数的变化非常敏感；墩高增大对桥墩主要验算指标有利；壁厚增大对桥墩主要验算指标呈现先有利后不利的趋势，这表明存在一个最优的壁厚取值。研究结果为同类型的桥梁设计提供参考。

Abstract:

The no-support continuous rigid-frame bridge is a relatively novel form of bridge structure. Taking the double-limb thin-wall pier no-support continuous rigid-frame bridge in a urban rail transit project as an example, a finite element model is established to analyze the design parameters of the double-limb pier. The results indicate that the main calculation indicators of the girder and pile foundation are not sensitive to changes in the design parameters of the double-limb pier. The composite stiffness is highly sensitive to changes in the design parameters of the double-limb pier. An increase in pier height is beneficial for the main calculation indicators of bridge piers. The increase in wall thickness shows a trend of first favorable and then unfavorable for the main calculation indicators of bridge piers, which indicates the existence of an optimal wall thickness. The research results provide reference for the design of similar bridges.