Study On Moment Redistribution Of Continuous Concrete-partial-filled Steel Box Composite Girders

The Continuous Concrete-Partial-filled steel box composite beams,which in the negative moment area of concrete filling limit of steel box in flexion,is conducive to the stability of the combination of local shear near the bearing bending enhancement,improves the bearing capacity at the same time,the stability of the traditional combination of components in negative moment area of compression settlement,ensure the rotation capacity of composite beams in the negative moment area.The rotation ability of the negative moment usually reflects the development degree of the plastic deformation of the composite beam,especially the redistribution of internal force of the statically indeterminate structure.According to the factors of the redistribution of internal force of composite beam,such as the deformation of the concrete wing plate,the slip deformation at the interface of the shear connector,the deformation of the steel bar and the steel plate.From the test and theoretical research perspective,designs six contrast specimens under static load,different steel ratio and shear connection degree of amplitude modulation of the internal force calculated by positive and negative plastic hinge sequence division of the combination of each beam internal force redistribution stress stage.The nonlinear behavior of materials based on the comparative analysis of established nonlinear finite element model of ANSYS test value,the plastic limit theory of modulation and simulation values are suitable for filling steel box concrete continuous composite beam simplified formula of plastic limit amplitude limit,and proved its reliability.