摘要
研究目的:高墩大跨度连续刚构桥悬浇施工中,最大悬臂状态下结构的稳定性至关重要。本文以牛角坪双线特大桥为工程背景,考虑结构的几何非线性和材料非线性,对施工过程中的主墩及最大悬臂状态进行了非线性屈曲分析,研究高墩大跨连续刚构桥施工阶段稳定性。研究结论:采用ANSYS有限元程序,建立了本桥最大悬臂状态实体单元模型,综合考虑了双重非线性的影响,研究该桥最大悬臂状态施工过程中可能出现的9种工况的施工稳定性,研究结果表明,该桥主墩纵向弯曲刚度小于横向弯曲刚度,墩相对较易发生纵向屈曲失稳,但稳定特征值大,其主墩自体稳定性及最大悬臂施工状态施工稳定性好,施工过程中结构不会发生稳定性破坏,对于工程实践具有实际指导意义。
Research purposes： During cantilever casting in construction of high-pier and large-span continuous rigid frame bridges,the structural stability in the longest cantilever status is very important.This paper studies the stability of Niujiaoping Double-line Super Bridge and analyzes the nonlinear buckling of the master pier in the longest cantilever status during construction based on consideration of the geometrical nonlinearity and material nonlinearity of the structure.Research conclusions：The FEM model for the longest cantilever status of the bridge is built with ANSYS finite-element program to study the bridge stability in the longest cantilever status under nine working conditions on considering bi-nonlinearity of the structure.The results show that the longitudinal buckling stiffness of the main pier is less than the transverse buckling stiffness,so the main piers are relatively easy to buckle in the longitudinal direction.However,the eigenvalues of the stability are large enough to stabilize the main pier and the largest cantilever during construction,and the structure damage due to buckling will not occur in the construction process.This study has directive sense to the similar construction.
出处
《铁道工程学报》
EI
北大核心
2010年第12期51-55,共5页
Journal of Railway Engineering Society
关键词
牛角坪
高墩
连续刚构桥
非线性
稳定性
Niujiaoping
high-pier
continuous rigid frame bridge
nonlinearity
stability
