In order to improve the problem that the stiffness of steel plate-bolted glue-laminated timber beams decreases in the range of 55%to 70%of the ultimate load,three groups of 12 steel-reinforced steel plate-bolted glue-laminated timber beams were designed and produced.Three sets of steel reinforcement-reinforced steel plate-bolted glue-laminated timber beams were tested in three-quarter-point loading tests by changing reinforcement rates,and compared with glue-laminated timber beams and steel plate-bolted glue-laminated timber beams with the same design parameters.Observe and record the loading process and damage phenomenon of the specimens,measure the ultimate bearing capacity,load-displacement curve,and strain curve of each group of specimens,and compare and analyze the influence of reinforcing reinforcement on the damage mechanism,bending stiffness,and ultimate bearing capacity of each group of specimens.The test results are shown as follows.Compared with the steel plate-bolted glued laminated timber beams,the bending capacity and overall bending stiffness of the steel reinforcement reinforced steel plate-bolted glued laminated timber beams are significantly improved by the reinforcing reinforcement.The problem of stiffness reduction of the steel plate-bolted test beams within the range of 55%～70%of the ultimate load reached is significantly improved.The damage form of the steel-reinforced steel plate-bolted connection test beams gradually changed from tensile fragile damage to tensile ductile damage and then to compressive ductile damage with the increase of reinforcement ratio.The strain distribution along the height direction of the reinforced beam section follows the flat section assumption.Based on the test data and theoretical deduction,the formula for the bending calculation of the test beam with steel reinforcement steel splint-bolt connection is obtained,and the theoretical results can be in good agreement with the test results.The research shows that the reinforcing reinforcement in the tensile zone of steel plate-bolted glued laminated timber beams can effectively improve the problem of reduced stiffness in the later stage and enhance its bending performance.The results can provide a theoretical basis and experimental support for the reinforcement of this type of connected timber beams.
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