Finite Element Analysis on Force Performances of Narrow Steel Box Continuous Composite Beams
To solve the problems of cracking in negative moment zones and buckling of steel boxes under compression in steel-concrete composite beams,it was proposed to optimize the steel-concrete composite beams by using narrow steel box continuous composite beams.Ultrahigh performance concrete materials were used to partially replace the concrete with strength grade C40 in the negative moment zones of bridge deck flanges in the narrow steel box continuous composite beams,forming ultrahigh performance concrete-narrow steel box continuous composite beams to further optimize force performances of the narrow steel box continuous composite beams.A finite element model of the ultrahigh performance concrete-narrow steel box continuous composite beams was established by using finite element analysis software ABAQUS.On the basis of verifying applicability of the model,bending process of the narrow steel box continuous composite beams was analyzed,and flanges,reinforcement and steel box clouds of the narrow steel box continuous composite beams were compared.The results show that the filling span of concrete in the narrow steel box continuous composite beams has a certain influence on the stiffness of the narrow steel box continuous composite beams.The cracking resistance of the flanges is significantly improved by the ultrahigh performance concrete materials,and the damage area in tension zones of the flanges is reduced by more than 95％.The stiffness,cracking load,and ultimate load of the narrow steel box continuous composite beams are greatly improved when the ordinary concrete materials are completely replaced by the ultrahigh performance concrete materials.
NETL
NSTL
万方数据
维普
