Evaluation of Interfacial Slip and Flexural Behavior of Dowel Laminated Timber Beams
Dowel laminated timber(DLT)is a kind of novelty structural timber made of lumber connected by dowels.Compared with glulam,it has the advantages of fast processing,low cost,and more green environmental protection.To evaluate the bending performance of DLT beams,eight groups of DLT beams were tested under four-point loads.The testing parameters include the types of dowels(wood and bamboo dowels),dowel spacing(70,100 and 140 mm),and the number of laminates(3,4,and 6 layers).In addition,to reveal the contribution of the interfacial dowelled connection among lumbers to the bending performance of DLT beams,push-out tests were also conducted on the wood or bamboo dowelled connection of DLT.The test results indicate that the bamboo dowel connection show a higher slip stiffness and a better ductility compared with wood dowel connections,and the bending performance of DLT beams with a composite action range from 0.11 to 0.15 which is lower than that of glulam beams but higher than that of unconnected timber beams.The bending performance of DLT beams increases significantly when adding the number of the laminates,while reducing the dowel spacing could improve the bending capacity and stiffness of DLT beams.Due to the fact that the bending stiffness of the DLT beam would be overestimated by the y method provided in Eurocode 5,a recommended reduction factor was proposed for the connection stiffness when it was used to calculate the bending stiffness of the DLT beam,to facilitate engineering design.
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