| Cold-formed steel is widely used in light steel structure, high strength and large openings make the member prone to buckling phenomenon. With lips of cold-formed thin-walled steel members opening local buckling of thin-walled steel members will appear local buckling, distortional buckling and overall buckling. Related to the role of the three buckling mode will appear under certain conditions.The destruction of opening cold-formed thin-walled steel members is controlled by the distortional buckling. This paper adopts link and bulkhead reinforcement measures to prevent curling Z steel beam distortional buckling specimens tested, and made test simulation with finite element software ABAQUS. The destruction of morphology, load-strain curve and load-midspan vertical displacement is analyzed and compared. Damage in the load block near the compression flange bending is the ultimate destruction of the three specimens, beam compression flange local buckling is not obvious.In the final chapter, experimental optimization is explored regard to problems in tests. Optimization measures include the reduction of the thickness of the top flange cover, the top flange cover into the steel sheets, loaded at the use of the stiffener. The main purpose of these measures is to reduce the non-pure bending stiffness of the section cover. These optimization measures are simulated by software ABAQUS. Found that damage in the load block near the compression flange bending beams did not happen, but along with the compression flange buckling failure, and reinforced buckling load and ultimate capacity improved in a different degree. |
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