Study On Pure Torsion And Warping Torsion Of Steel And Concrete Composite Beam

Steel and concrete composite beam is a new type of beam which connected by shear connectors.It has the advantages of high bearing capacity,high stiffness and good ductility.In view of its superior performance,it has been more used in the field of civil engineering,curve composite beams have a greater advantage with varied topography,such as mountain area,hills,valleys.At present,the main research on straight composite beams is the internal force,deformation and interface slip,temperature and creep effect,and the torsion properties of the straight line composite beams,and curved composite beam torsional performance is relatively.In this paper,based on the energy method and elastic theory,the torsion and buckling performance of steel and concrete composite beams were studied.According to the structural characteristics of steel and concrete composite beams,based on the energy method,established the torsion Angle differential equation of composite beams,so normal stress,shear stress,warping displacement and warp double torque and buckling torque calculation formula of composite beam section were given.However,the correctness of the calculation formula,applicability,is still needs further validation test.According to the structural characteristics of curved composite beams,using the theory of elasticity,establish balance differential equation of the curve composite beams under different load,and the equivalent torque of moment calculation formula were given.At the same time,gives the calculation formula of curve composite beam centroid and shear centre.According to the structural characteristics of curved composite beams,using finite element program ABAQUS,established a suitable finite element calculation model according to its characteristics.Calculation results show that the thickness of the steel has a great influence on the torsion properties of the curved composite beams,the thickness of concrete slab only had a greater influence on the of curve T beam,radius of curvature of curved composite beams effects on the torsion properties is smaller.