Research on the Force Transmission Mechanism at the Beam-Arch-Pier Joint in Continuous Rigid Frame Arch Bridge
Based on the engineering background of Wangjiahe Super-large Bridge on Xi'an-Yan'an High-speed Railway,this paper establishes the local solid model of the beam-arch-pier joint,analyzes the spatial stress state of the joint,grasps the stress concentration area and weak position,and discusses the internal force distribution mechanism and transmission law,aiming to provide theoretical basis and data support for the design of the beam-arch-pier joint.The results show that the range of 1/3.2 of the length of the arch rib at the junction of the arch rib and the arch foot is the characteristic length of stress transmission,and the range of 1/4.5 of the length of the main beam at the junction of the beam,arch,and pier is the characteristic length of stress transmission.The arch rib at the middle support section at the junction of the beam and arch diffuses 81.2%of the internal force to the arch foot concrete through the stiffed gusset plate.
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