腹拱对V形支撑0#块的影响分析及其结构优化研究

An Analysis of the Influence of an Abdominal Arch on Block 0# of the V-shaped Support and a Study of Its Structural Optimization

依托桂林龙门大桥新建工程项目,针对大跨度带腹拱V形支撑0#块最不利的施工工况,建立0#块有限元模型,同时建立不带腹拱的V形支撑0#块和不考虑腹拱自重的0#块有限元模型进行对比分析,得出腹拱自重是造成0#块应力恶化的主要原因;提出了一种新的结构形式——采用横墙作为0#块主梁中间支承的结构,仿真分析证明这种方式可以同时控制V形支撑上主梁的挠度以及V形支撑底部的不利应力。

Based on the newly-built engineering project of the Longmen Bridge in Guilin and aiming at simulating the most unfavorable construction conditions,a finite element model for Block 0#is established in the paper,and meanwhile,a model for the V-shaped support Block 0# without the abdominal arch and a model for the V-shaped support Block 0# without considering the self-weight of the abdominal arch are respectively established in order to compare and analyze them,upon the basis of which it is found that the self-weight of the abdominal arch is the main cause that makes the stress of Block 0# deteriorate,in which case a new structure is suggested in the paper where a transverse wall is used as the middle support structure for Block 0# of the main beam,which can control both the deflection of the main beam on the V-shaped support and the unfavorable stress of the bottom of V-shaped support at the same time.