摘要
为研究下承式悬链线钢管混凝土拱桥空间稳定性及影响该种桥型结构稳定的参数敏感性,以运城市某省道上一座27+60+27 m下承式悬链线钢管混凝土拱桥为背景,采用Midas/Civil 2012有限元软件对该桥进行建模,在成桥状态及成桥运营状态2种工况下对其进行稳定性分析。结果表明,该种桥型拱肋结构存在“面内失稳”和“面外失稳”2种失稳状态,拱肋面外刚度小于面内刚度,拱肋结构失稳模态首先表现为拱肋面外侧弯失稳。同时选取拱肋间连接形式、拱肋钢管壁厚t、拱肋单侧吊杆布置数量n、拱肋管腔混凝土弹性模量E、拱肋矢跨比f/L、拱肋拱轴系数m等影响结构稳定性的参数进行对比分析,得出影响结构稳定性的敏感参数,可供同类型桥梁在结构稳定性设计时参考借鉴。
To study the spatial stability of through catenary concrete-filled steel tube arch bridge and the parametric sensitivity influencing the structural stability of this type of bridge,this paper employed Midas/Civil 2012 finite element software to model a through catenary concrete-filled steel tube arch bridge in Yuncheng.The bridge was in completed state and in completed operation.The results show that the bridge arch rib structure has two kinds of instability states:in-plane instability and out-of-plane instability.The out-of-plane stiffness of the arch rib is less than in-plane stiffness.The instability mode of the arch rib structure is first manifested as out-of-plane bending instability of the arch rib.At the same time,the parameters affecting structural stability,such as the connection form between arch ribs,the wall thickness of arch rib steel tube,the number of single-side suspenders,the elastic modulus E of concrete in arch rib cavity,the rise-span ratio f/L of arch rib,and the arch rib-arch axis coefficient m,are compared and analyzed,and the sensitive parameters affecting structural stability are obtained,which can be used for similar bridges in structures.
作者
关伟
Guan Wei(Surveying and Designing Institute of Shanxi Province,Taiyuan 030006,China)
出处
《石家庄铁道大学学报（自然科学版）》
2020年第1期14-19,共6页
Journal of Shijiazhuang Tiedao University(Natural Science Edition)
关键词
钢管混凝土桥
悬链线拱轴线
空间稳定性
特征值
失稳模态
beam-arch combination continuous girder bridge
catenary arch axis
spatial stability
eigenvalue
instability mode
