高墩大跨径连续刚构桥的稳定性设计分析

Design and Analysis on Stability of High-pier Long-span Continuous Rigid-frame Bridge

高墩大跨径连续刚构桥是复杂山区环境应用较多的桥型结构,其稳定性问题是设计的重点和难点。基于结构稳定原理阐述了弹性稳定用于桥梁设计验算的工程意义,依托某大跨径连续刚构桥分析了提高桥梁稳定的设计构造方法,并通过有限元方法进行了参数化研究和验证。研究表明,高墩的壁厚和连系梁的设计对稳定性影响显著,结合实际工程给出了最优的设计方案。

The high-pier long-span continuous rigid-frame bridge is a bridge structure more applied in the complex mountainous environment. Its stability is a critical point and difficult point of the design. Based on the principle of structural stability, the engineering significance of elastic stabilization for checking calculation of bridge design is expounded. Relying on a long-span continuous rigid-frame bridge, the design and construction methods to improve bridge stability are analyzed, and the parametric study and verification are carried out through the finite element analysis. The results show that the wall thickness of high pier and the design of connecting beam have the significant influence on the bridge stability. Finally,the optimal design scheme is given by the practical projects.