The steel-wood composite beam with I-section is made of laminated veneer lumber (LVL) and cold-formed thin-wall steel by structural adhesive. The flexural properties of nine composite beams are tested with parameters such as LVL plate thickness, section height, thin wall steel thickness and flange LVL width. The failure forms, deflection development, strain distribution and bearing capacity of specimen are observed, the influence factors of flexural property are analyzed, and a formula for calculating mid-span deflection considering the slip effect is proposed. The results show that steel-LVL composite beams have good overall working performance. The composite beam has a high deformation ability before failure, and the most typical failure mode is the lower flange LVL fracture. The material properties are fully utilized, showing good ductility. The flexural bearing capacity of composite beams can be improved by increasing the ratio of section height to width and web height to thickness and reducing the ratio of flange width to thickness. The slip between the LVL and the section steel reduces the stiffness of the composite beam. Compared with the results without taking slip into account, the theoretical calculation results of mid-span deflection of composite beam with interface slip effect are closer to the real deformation, and the calculation accuracy is improved by 2.38%.
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