摘要
结合多座桥梁的稳定性分析经验,从结构体系与结构刚度方面入手系统总结了斜拉桥弹性稳定安全系数、失稳模态在全过程中的发展规律。针对组合梁斜拉桥钢主梁(工字形加劲截面)在横桥向抗弯刚度较小且容易在横桥向发生局部失稳的现象,研究了组合梁斜拉桥全过程的整体-局部弹性相关稳定性及其发展规律。研究结果表明:采用悬臂法施工的斜拉桥全过程安全系数、失稳模态具有相同的变化规律。考虑弹性相关稳定后,在全过程中组合梁斜拉桥不只表现为结构的整体失稳,在大悬臂梁段的某些阶段将重复出现钢主梁的局部失稳,并导致结构安全系数出现显著的降低。
With reference to much experience of stability analysis of numerous bridges, the development law of the elastic stability safety coefficient and the buckling mode of cable-stayed bridge during the whole construction process was summarized from the aspects of structural system and stiffness. In view of the smaller transverse bending stiffness of the composite deck cable-stayed bridge＇ s main girder （X-shaped stiffened cross-section） which easy to occur local instability at transverse direction, the global-local elastic correlative stability and the development law of the bridge during construction were studied. The results show that （ 1 ） the safety coefficient and the buckling mode have the same changes during the entire cantilever-construction process; （2） with consideration of the global-local elastic correlative stability, not only all stages no more behave global instability but some stages behave local buckling repeatedly as well in larger cantilever girder status and the stability safety coefficient of the structure reduces obviously.
出处
《公路交通科技》
CAS
CSCD
北大核心
2009年第10期71-75,共5页
Journal of Highway and Transportation Research and Development
关键词
桥梁工程
组合梁
整体稳定性
相关稳定
斜拉桥
bridge engineering
composite beam
global stability
correlative stability
cable-stayed bridge
