山区高墩大跨连续刚构桥施工阶段稳定性影响参数分析

Influence Parameters of Stability of Continuous Rigid Frame Bridge with Long Span and High Piers in Mountainous Area

以某连续刚构桥为工程背景,利用大型通用有限元软件ANSYS建立数值模型,研究结构初始缺陷、荷载因素和结构设计参数对山区高墩大跨连续刚构桥施工阶段稳定性的影响程度,得出不同参数对高墩大跨连续刚构桥施工过程稳定性影响的规律及原因。结果表明:结构初始几何缺陷、初始材料缺陷、风荷载、温度荷载、施工不平衡荷载和结构材料强度对结构施工阶段的稳定性影响较大,应采取适当的控制措施,保证结构在施工阶段的稳定性和安全性。

On the basis of a continuous rigid frame bridge,the numerical model was established with the finite element software ANSYS,and the degree of the influence of initial imperfections,load factors and structural design parameters on the stability of the continuous rigid frame bridge with long span and high piers in construction stage in mountainous area was discussed.Disciplines and causes of different parameters affecting the stability of the continuous rigid frame bridge with long span and high piers in construction stage were also discussed.The results show that initial geometrical imperfections,initial material imperfections,wind load,temperature load,unbalanced construction load and strength of materials impose great influence on the stability of the structure in construction;some proper measures should be taken to assure the stability and safety of the structure in construction stage.