Overall Stability Analysis Of Open Thin-walled Steel Members With Strengthening

The effect of the load, stiffness and plane thin-walled beams in a plane outer stiffness compared to large lot. Open thin-walled wall thickness is generally small, the torsional buckling or poor performance, flexural torsional buckling torsion may be under pressure. In order to improve the stiffness of thin-walled bar, usually in the opening set horizontal contact, such as slabs, bracing, partition and all kinds of elastic medium. Using batten plate transverse connection of open thin-walled reinforced stress deformation characteristics, Compared with the original open section thin-walled bar, the bar section warping is greatly reduced and the torsional rigidity is improved greatly, from an economic point of view, more cost savings.Based on open thin-walled bar with stiffening member overall stability analysis, th e components can be divided into two parts whith included open components and the str ength member. By using the classical theory of operator pull soff to the opening part, an d using linear interpolation function to describe the longitudinal warping displacement o f artifacts, and introducing discontinuous assumptions of strunthened component, thus t he paper established the calculation model for the analysis of the bar, the Lagrange equa tions of the problem.We finally conclud the Hamiltonian system of stability analysis bas ed on open thin-walled bar with stiffening member.On the precise integration method of both ends of the boundary value, through the exact solution of the problem which solved by the corresponding program in MATLAB language, then validate by numerical example of different cross section forms, finally b y this way, we prove the correctness of this method.The calculation process of this meth od is not only simple and clear, but also highly accuracy to the numerical solution, it pro vides a new method to research the overall stability of open thin-walled bar with batten plate.