In order to explore flexural behavior of cold-formed thin-walled C-shaped steel-concrete composite beam,five composite beam specimens with different cross-section combinations were fabricated and designed,and flexural behavior test was carried out to analyze the bearing performance and failure mechanism.On the basis of the test,the nonlinear analysis of the composite beam was carried out by the finite element analysis software ABAQUS,and the parameter analysis was carried out to study the influence of material and size on the performance of the composite beam.Based on experimental research and finite element simulation analysis,the bearing capacity model of cold-formed thin-walled C-shaped steel-concrete composite beam was established,and the bearing capacity and stiffness were theoretically analyzed.The results show that the main failure modes of each composite beam are ductile failure.The finite element model of composite beam established by ABAQUS can better simulate the stress process of cold-formed thin-walled C-shaped steel-concrete composite beam.With the increase of yield strength of C-shaped steel,the ultimate load is increased by 56.5%.For every 1mm increase in the thickness of C-shaped steel,the ultimate load increases by 28.5%on average.For every 50mm increase in the height of the section,the ultimate load increases by about 20%.However,increasing the strength grade of concrete has little effect on the bearing capacity of composite beams.The calculation method of flexural capacity and stiffness of cold-formed thin-walled C-shaped steel-concrete composite beams was derived.It is found that the calculation results are in good agreement with the experimental results.
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