Abstract
Shear lag effects of curved box beam under vehicle loads are investigated by using three-dimensional finite element method, where 4 parameters of vehicle loads, load size, vehicle speed, vehicle load position, load types, are considered. The change rules of stress distribution and shear lag coefficients of upper flange at mid-span are obtained when the loads move to the mid-span. The results indicate that under vehicle loads, the peak shear lag coefficients is at the junction between the flange and web, shear lag effect is prominent, shear lag effect is greatly influenced by vehicle speed and vehicle load position, while load size and load types almost don’t affect shear lag coefficients but do affect the stress. The model experiment of a cantilever curved box beam is carried out to compare with finite element analysis, and the error between them is small, which testify the validity and reliability of finite element model.
Highlights
Thin-walled box beam is a common structure type in bridge construction
3D finite element analysis is employed to study the influence of four parameters on shear lag effect under vehicle loads, experiment is performed to verify the validity of the curved box beam models
The finite element model of curved box beam is shown as figure 2, there are 2204 elements and 2242 nodes, as for boundary conditions, Ux, Uy, Uz and Uy, Uz are restricted at the junction between web and bottom flange in one side, while Ux, Uy and Uy are restricted in the other side
Summary
Because of shear lag effect [1], stress of flange is non-uniformed distributed along width, lots of researches of shear lag effect under static loads have been studied home and abroad so far [2-6], where concentrated loads and distributed loads are utilized most of the time. Unlike straight box beam, curved box beam considered curvature radius will produce strong coupled effect of bending and torsion, making it difficult to compute its deformation and internal force, the impact of vehicle loads and vertical seismic excitation can intensify it if under dynamic loads, it is very necessary to study shear effect of curved box beam under dynamic loads. 3D finite element analysis is employed to study the influence of four parameters on shear lag effect under vehicle loads, experiment is performed to verify the validity of the curved box beam models
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
