Analyses Of Performance And Ultimate Capacity For Half-through Handle-basket Arch Bridge Steel And Concrete Hybrid

First of all,the development and examples of steel arch bridge at home and abroad is reviewed.And the structural characteristics of steel arch bridge are summarized.To a 120 m half-through steel box handle-basket arch bridge in city,the project survey and main parameters in bridge design are introduced in detail.A finite element software MIDAS/CIVIL is used to establish a full-bridge analysis model based on beam element to the 120 m halfthrough steel box handle-basket arch bridge in city,the suspender cable is simulated by truss elements,the other members are simulated by beam elements,the orthotropic steel deck is simulated by beam grillage model.The internal forces,stresses and deformations of steel box and main girder under the actions of dead load and other 6 load combinations are calculated in the stage of bridge operation.The general finite element software MIDAS/FEA is used to establish a detailed full-bridge intergrated element model based on beam elements,truss elements,plate and solid elements.The stress levels of the steel-concrete composite section of arch rib under the most unfavorable stress state are calculated and analyzed under different conditions.Based on the detailed analysis model of MIDAS/CIVIL full bridge unit,the optimization of arch rib section is carried out,and the optimization and comparison are made before and after optimization.Ultimate capacity calculation and analysis are done by increasing the load multiple of both the dead load and unfavorable live load and increasing the unfavorable live load only.The corresponding ultimate load factor is obtained at the same time.