摘要
失稳破坏是大跨度的上承式钢管混凝土拱桥破坏的形式之一,其危害性比强度破坏更大。针对目前对上承式钢管混凝土拱桥的非线性稳定研究较少的现状,以某大桥上承式钢管混凝土拱桥为对象,研究了大跨度上承式钢管混凝土拱桥的稳定问题,建立其空间有限元模型。对该大桥成桥阶段的力学性能进行线性、非线性稳定性分析,讨论了正对称偏心与反对称偏心对稳定系数的影响,研究结果表明考虑了正对称偏心或反对称偏心后,会引起非线性稳定系数变小,该结论对今后同类桥型的设计与施工有一定的参考价值。
Stability is crucial to concrete filled steel tubular arch bridge,which is more dangerous than strength damage.Up to now, the nonlinear stability analysis of deck-type concrete filled steel tubular(CFST)arch bridge is studied less.A spatial nonlinear model is established and the linear and nonlinear analyses of stability on a large- span CFST arch bridge are made.Discussions on symmetrical and asymmetrical initial imperfections are studied and results show that they would weaken the stability of the deck- type CFST arch bridge.The results may be valuable for the design and construction of such kind of bridges.
出处
《上海公路》
2008年第2期50-53,64,共5页
Shanghai Highways
关键词
钢管混凝土拱桥
非线性
稳定性
初始偏心
concrete filled steel tubular arch bridge
nonlinear
stability
initial imperfection
