Interfacial shear behavior of glulam-CLT composite beams with inclined self-tapping screw connectors
To research the interfacial shear behavior of inclined self-tapping screw(STS)connectors between glued laminated timber(GLT)beam and cross laminated timber(CLT)slab,a series of push-out tests were carried out on six groups of shear specimens for GLT-CLT interfacial connections.The effects of the arrangement,penetration length and number of STS on interfacial shear behaviors were considered in the experimental research.The STS arrangements included shear-tension screws,shear-compression screws and cross inclined screws.The test results show that the load-carrying capacity of the shear-tension screw connections is approximately six times that of the shear-compression screw connections.The load-carrying capacity of the cross inclined screw connections is approximately the sum of the load-carrying capacities of the shear-tension and shear-compression screw connections,and the slip stiffness also conforms to this rule.Based on the revealed failure mechanism of inclined screw connections,the calculation methods to calculate the slip stiffness and load-carrying capacity of shear-tension screw connections based on a rigid model,as well as the slip stiffness and load-carrying capacity of shear-compression screw connections by considering the typical double-hinge damage mode based on the elastic foundation beam theory were proposed.Based on the superposition of shear behaviors of shear-tension and shear-compression screw connections,the slip stiffness and load-carrying capacity of cross inclined screw connections were obtained.The theoretical calculation results are in good agreement with the test results.
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