Study On Bending Behavior Of Spatial Steel Frame Concrete Continuous Beam

The spatial steel frame is a space steel truss welded by angle steel and strips,replacing the traditional reinforcement skeleton to form the spatial steel frame concrete beam.It has the characteristics of high bearing capacity,high stiffness and good ductility.In order to study the application of spatial steel frame in statically indeterminate structure of concrete,the bending performance of the spatial steel frame concrete continuous beam is studied by finite element analysis in this paper.To study the bending behavior of spatial steel frame concrete continuous beam,the bending moment amplitude adjustment coefficient and the matching hoop characteristic value of the spatial steel frame are taken as the parameters,5 spatial steel frame concrete continuous beam test specimens are designed in this paper,which is also used as a basic simulation specimens for finite element analysis.A concrete continuous beam model is created by ABAQUS software.The accuracy of the model was proved by comparing and analyzing the failure pattern and bending moment-deflection curve.Based on the test design,the spatial steel frame concrete analog beam is designed with the moment amplitude coefficient,the reinforcement properties of hoop of the spatial steel frame and span number.The simple supported beam model is designed to compare the bending performance with the double-span continuous beam under the same conditions.The bending performance is studied by the analysis of load-deflection curve.Based on the results of the finite element analysis,analyse the plastic internal force redistribution and plastic hinge performance of double-span beam.A formula for the length of the equivalent plastic hinge at the middle support is proposed.According to the numerical analysis of the simulated beam,the function between the moment amplitude coefficient and the reinforcement properties of hoop of the spatial steel frame is established.Based on the finite element research results,the material selection,section dimension,calculation method of normal section and calculation method of plastic hinge are analyzed.The method of amplitude design of the spatial steel frame concrete continuous beam is proposed.The range of the amplitude coefficient of the spatial steel frame concrete continuous beam is given.