斜分式拱桥的稳定因素分析

Analysis of Stability Factors of Oblique-Split Arch Bridge

斜分式拱桥由于拱肋的异化,导致结构受力复杂且空间效应明显。以珠海市斗门区某座斜分式拱桥为工程背景,运用有限元分析软件MIDAS/Civil建立多组空间有限元模型,对比分析矢跨比、拱肋倾角、拱间联系等拱肋设计的参数对拱桥稳定的影响。研究表明:副拱倾角改变和主、副拱间联系的连接次序对结构稳定影响很小;拱肋尺寸和矢跨比对结构稳定有一定的影响;拱间联系的连接形式及布置方式对结构稳定影响较大。最终结合景观效果、结构受力、稳定提出斜分式拱桥拱肋间联系的合理布置形式,可为类似桥梁设计提供借鉴。

Due to the dissimilation of the arch ribs,the stress distribution of the skewed arch bridge is complex and the spatial effect is obvious.Taking a oblique-split arch bridge in Doumen District,Zhuhai as the engineering background,multiple spatial finite element models are established using the finite element analysis software MIDAS/Civil to compare&analyze the influence of parameters such as the rise-span ratio,the inclination of the arch ribs,and the connection between the arches on the stability of the arch bridge.The research shows that the change of the inclination of the secondary arch and the connection sequence between the primary and secondary arches have little influence on the structural stability;the size of the arch ribs and the rise-span ratio have a certain influence on the structural stability;the connection form and layout of the connection between the arches have a significant influence on the structural stability.Finally,combining the landscape effect,structural stress&stability,a reasonable layout form of the connection between the arch ribs of the skewed arch bridge is proposed,which can provide reference for similar bridge design.