Experimental study on flexural behavior of T-shaped steel-wood composite beams
In order to realize the effective combination of wood and steel and improve the bending performance of steel-wood composite beams,a new type of T-shaped steel-wood composite beam with cross section is proposed.Four-point bending tests are carried out with T-shaped steel web thickness,flange thickness and bolt spacing as parameters.The results show that the pure wood beam is a typical brittle failure,and the composite beam exhibits good ductility characteristics.Steel and wood can work harmoniously,and wood can provide lateral restraint for the steel web to prevent the steel web from yielding prematurely.At the same time,the steel flange plate can enter the tensile yield stage and the wood beam top can also reach the compressive strength,giving full play to the excellent properties of their respective materials.Compared with pure wood beams,the flexural capacity and stiffness of composite beams is improved by 24.3％at the minimum and 91.5％at the maximum.Increasing the thickness of steel web and flange can improve the flexural capacity and stiffness of composite beams,while increasing the spacing of bolts has little effect on the flexural capacity and stiffness of composite beams.The composite beam can still bear the load after reaching the ultimate load,and has good plastic characteristics and energy dissipation performance.The calculation formula of flexural capacity in elastic stage is put forward,and the experimental values are compared with the calculated values,and the results are in good agreement.
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