Finite Element Calculation of Connection Nodes Between Main Girder and Overhanging Beam in Steel Box Girder Bridges
In order to provide reference for the structural design of steel box girder bridges with extended crossbeam,a"single-beam finite element model"and a"beam-plate multi-scale finite element model"are established,followed by in-depth analyses on the mechanical characteristics of the girder-crossbeam joint.The results show that:due to different internal forces'transmission modes be-tween the two models,the maximum mid-span deflections of the girder and the crossbeam in the multi-scale model are 11.46%and 33.73%respectively smaller than those in the single-beam model;the shear-lag phenomenon of the normal stress distribution of both the top and bottom plates is significant,and so is the stress concentration problem of the shear stress distribution of the web plates;furthermore,the normal stress of the cantilever flange of the box girder is considerably greater than that of the other regions of the top plate.According to the above-mentioned mechanical characteristics of the joint structure,optimization suggestions such as re-ducing the width-span ratio of the girder,thickening the steel plate in the high-stress-level areas,setting an arc at the corner of the top plate and utilizing steel-UHPC light-weight composite deck structure are proposed.
extended crossbeamsteel box girder bridgesmulti-scale finite element modelshear lag
NETL
NSTL
万方数据
维普
