基于特征值屈曲分析的高墩大跨连续刚构桥稳定性研究

Study on Stability of High-pier Long-span Continuous Rigid-frame Bridge Based on Eigenvalue Buckling Analysis

摘要:

分析了1座山区高墩大跨连续刚构桥在施工期裸墩、最大悬臂阶段和成桥阶段不同结构体系状态下的稳定性差异。研究结果表明：裸墩状态下，风荷载对结构稳定的影响可以忽略；T构最大悬臂状态刚构桥稳定性风险最大，应重点控制施工误差及偶然因素的发生；墩间横系梁的设计对结构稳定性的贡献可以忽略。

Abstract:

The stability difference of a high-pier long-span continuous rigid-frame bridge in mountainous area under the different structural system states in the construction period of bare pier, the maximum cantilever stage and the completion stage of bridge is analyzed. The study results show that the influence of wind load on the stability of the structure can be ignored under the condition of bare pier. The stability risk of T-frame rigid frame bridge in the state of maximum cantilever is the biggest. The construction error and accidental factors should be controlled. The contribution in the design of tie beams between piers to the structural stability can be neglected.