重庆菜园坝长江大桥稳定分析

STABILITY ANALYSIS OF CAIYUANBA YANGTZE RIVER BRIDGE IN CHONGQING

重庆菜园坝长江大桥是一座钢箱系杆拱桥。以重庆菜园坝长江大桥为工程对象,根据设计资料,采用多种单元类型(包括梁单元、杆单元和壳单元等),建立了该桥完整的三维空间有限元模型,进行了菜园坝长江大桥恒载作用下成桥阶段的稳定分析,根据本桥的特点,对影响该桥稳定性的参数进行分析,给出各参数对大跨度拱桥稳定性的影响趋势,并针对主跨,计算出了非保向力对大跨度拱桥侧倾的影响;对以后同类桥型的工程设计有指导意义。

Caiyuanba Yangtze River Bridge is a steel-box tie-bar arch bridge.Based on geometry and material properties of structure components in designed drawings of Caiyuanba Yangtse River Bridge in Chongqing,three-dimensional finite-element model founded with all kinds of elements(beam element,bar element and shell element,etc),this thesis analysize stability analysis of the bridge in finished phase under dead loads.And based on the characters of the bridge,parameters influencing buckling eigenvalues of the bridge,like the number and types,the types of suspender and follower force,are analysed,and the influencing trend on buckling eigenvalues of the long span arch bridge is achieved in aim of instructing the design of the same bridge types.Aiming at the main span,the influence of the follower force on lateral buckling is computed.