摘要
单片钢管混凝土柔拱刚梁组合体系桥梁可以有效改善大跨度梁桥跨中下挠以及开裂问题,同时可以减小主梁结构的建筑高度,但柔性拱的稳定性问题较为突出。为解决该问题,依托城市桥梁恒太河特大桥,建立空间有限元计算模型,进行弹性及非线性稳定分析。通过各种措施,有效的提高了柔性拱的稳定性,研究结果表明:采用双吊杆体系,以及在上弦杆之间设置斜撑杆可以有效提高空间拱肋的横向稳定性;随着平联杆截面尺寸的增加,结构的横向稳定性有所提高,但效果不显著;随着矢高或跨中上弦杆顶撑距的增加,拱座对结构的横向约束效应逐渐降低,结构的横向稳定性逐渐下降,但影响较小;对于跨度较大的柔拱刚梁钢管混凝土拱桥,有必要考虑初始缺陷的影响,对结构进行非线性稳定分析。
Single piece CFST flexible arch rigid beam composite bridge can effectively improve the midspan deflection and cracking of long-span beam bridges,and reduce the building height of the main beam structure,but the stability problem of flexible arch is more prominent.In order to solve this problem,the space finite element calculation model is established based on the urban bridge Hengtai River Bridge to carry out elastic and nonlinear stability analysis.Through various measures,the stability of the flexible arch is effectively improved.The research results show that the transverse stability of the space arch rib can be effectively improved by using the double suspenders system and setting diagonal braces between the top chords.With the increase of the cross section size of the parallel link,the lateral stability of the structure is improved,but the effect is not significant;With the increase of the rise height or the top brace distance of the upper chord in the mid span,the lateral restraint effect of the arch seat on the structure decreases gradually,and the lateral stability of the structure decreases gradually,but the influence is small;For concrete filled steel tube arch bridge with flexible arch and rigid beam with large span,it is necessary to consider the influence of initial defects and conduct nonlinear stability analysis on the structure.
作者
王鹏
刘爽
尤岭
WANG Peng;LIU Shuang;YOU Ling(Changjiang Institute of Survey,Planning,Design and Research,Wuhan 430010,China)
出处
《建筑结构》
北大核心
2023年第S01期1924-1928,共5页
Building Structure
关键词
钢管混凝土拱桥
柔拱刚梁
稳定性分析
组合体系
concrete filled steel tube arch bridge
flexible arch rigid beam
stability analysis
combinatorial system
