混合钢桁梁斜拉桥施工过程静力稳定影响因素分析  

Analysis of Influencing Factors on Static Stability of Hybrid Steel Truss Girder Cable-Stayed Bridge during Construction

作　　者：薛梦归 XUE Menggui(CCCC Highway Consultants Co.,Ltd.,Beijing 100010,China)

机构地区：[1]中交公路规划设计院有限公司,北京100010

出　　处：《交通科技》2023年第4期46-50,共5页Transportation Science & Technology

摘　　要：文中采用有限元数值计算方法,计算在横向静风荷载、整体温度效应或施工线形误差的影响下,某混合钢桁梁斜拉桥施工过程中线弹性稳定、几何非线性极值点稳定和双重非线性极值点稳定3种情况下的稳定安全系数和失稳模态。结果表明,横向静风荷载对后期施工阶段双重非线性稳定影响较大,随着主梁悬臂长度的增加,横向静风荷载引起的横桥向位移应引起重视;整体温度效应对施工过程稳定性影响很小;桥塔顺桥向倾斜施工线形误差对双重非线性稳定中以桥塔失稳为主的施工阶段影响很大,主梁竖平面内施工线形误差对施工过程稳定性基本无影响,主梁横桥向平面内施工线形误差对几何非线性极值点稳定中以主梁失稳为主的施工阶段影响较大。In this paper,the finite element numerical calculation the effects of lateral static wind load,whole temperature effect or construction alignment error was adopted to determine the stability safety factors and instability mode of the hybrid steel truss cable-stayed bridge in the linear-elastic stability and the nonlinear stability of two cases:only considering the geometric nonlinearity and considering the geometric and material nonlinearity.The results showed that the lateral static wind load has significant impact on the double nonlinear stability during the later construction stages.As the length of the main beam cantilever increases,the lateral displacement caused by lateral static wind load should be taken seriously.The overall temperature effect has little effect on the stability of construction process.The construction alignment error of the pylon longitudinal tilt has significant effect on the double nonlinear stability of these construction stages of which the instability mode is the pylon instability,and the construction alignment error of the steel truss beam in vertical plane has almost no impact on the stability of construction process.While,the construction alignment error of the steel truss beam in lateral plane has a great influence on the geometric nonlinearity extreme points stability of these construction stages with the instability mode of the beam instability.

关 键 词：横向静风荷载 整体温度效应 施工线形误差 线弹性稳定 非线性极值点稳定 

分 类 号：U441[建筑科学—桥梁与隧道工程]