To explore the influence of different key design parameters on the stiffness performance of girder-arch combination system bridge,the concept of representative stiffness is firstly introduced,and theoretical calculation formulas are obtained based on the definition.Taking Victory Bridge in Yudu of Jiangxi as the engineering background,the structural stiffness of the combination system was analyzed and calculated,and the parameters such as the main girder stiffness,main arch stiffness,and suspension cable diameter were considered separately.Based on the single parameter variable method and the constant total steel consumption,multiple finite element calculation models under different design parameter modes were established,and the calculated results were compared and analyzed.The results show that in girder-arch combination system bridge,the material consumption of the arch structure is not high,but it significantly improves the stiffness of the girder structure;The suspension structure does not directly provide representative stiffness,but it is used for force distribution between girder and arch structures,thereby affecting the effect of the arch on improving the representative stiffness of the girder;It exists an optimal arch-girder stiffness ratio,under the condition of constant total material consumption,which represents the maximum stiffness when it is combined;There is a logarithmic function relationship between the arch-girder stiffness ratio and the increase in stiffness represented by the main girder.
关键词
桥梁工程/梁拱组合体系/代表刚度/有限元分析/参数分析/拱梁刚度比
Key words
bridges/girder-arch combination system/representative stiffness/finite element analysis/parameter analysis/arch-girder stiffness ratio
维普
万方数据