秸秆-冷弯薄壁型钢组合梁抗弯性能有限元分析OA

Taking cold-formed thin-walled steel and straw board as the main materials,a new type of box-section straw-cold-formed thin-walled steel combined beam was constructed by using the connection method of straw board wrapped with cold-formed thin-walled steel.The finite element software ABAQUS was used to establish 7 groups of 25 combined beam models to analyze the effects of connection method,straw board thickness,steel thickness,steel height,web bolt rows,web bolt spacing and beam span on the flexural performance of the combined beams,and to explore the damage modes and damage mechanisms of the combined beams in the case of flexural damage.The results showed that the lower flange of the straw board reached the tensile strength before the upper flange in the finite element simulation loading pro-cess,which led to bending cracks and bending damage in the mid-span region of the combined beam,and the lower flange of the straw board underwent localized compression bending and conformal shear damage in the process of load in-crease.Each parameter had a different degree of influence on the flexural performance of the combined beams,among which the thickness of the straw board,the thickness of the steel and the height of the steel had the most significant influ-ence on the flexural performance.The optimum combination parameters of the combined beams were as follows,with high bending load capacity and small deflection deformation,using adhesive connection,48 mm thickness of straw board,2.5 mm thickness of steel,and 200 mm height of steel.The web bolts were arranged in two rows with a spacing of 150 mm,and the overall span was 1800 mm,which was verified to be in line with the expectation by the test.The combination of cold-formed thin-walled steel and straw board can effectively utilize their respective advantages and sig-nificantly improve the flexural load capacity of the combined beam.