Abstract
Bolted joints are widely used in timber structures, and the loosening of bolt connections will reduce the structural performance. In this paper, a mechanical model of bolt connection for timber structures is established, and the process of bolt loosening under a transverse load is investigated. By using the finite element method to construct an accurate thread model with a helix angle, the thread contact state during the bolt loosening procedure was analyzed in detail, and the factors such as load amplitude, load frequency, load location, and different timber materials on bolt loosening are also studied. In the timber structure, the load amplitude is the main factor affecting the bolt loosening, the decay rate of the preload in the bolted joint is positively correlated with the amplitude of the cyclic transverse load. The frequency of the loading has a smaller effect on the looseness, the preload decreases as the frequency increases. When the load is applied to the smooth rod part of the bolt, the preload force will decrease rapidly, and the distance between the load position and the bolt has no effect on the change in looseness. The decreasing range of the preload is different with different timber material, but the decreasing law is the same. The model can be applied to analyze the loosening rule of bolted connections in timber structures.
Highlights
Bolted connections have been widely applied to timber structures due to their advantages of a reliable connection and convenient operation
Zhou [2] studied the effect of load amplitude and material under shear load, and the results showed that the amplitude of shear load at a critical point below which the bolt will not be completely loose
In theand analysis setting of the ABAQUS software, the transverse load amplitude was set to 0.8 mm Discussion and the action position was on the end face of the lower plate, and the change of the contact state of the contactofsurface between the bolt head Connections and the upper plate and the contact surface between the Analysis the Loosening
Summary
Bolted connections have been widely applied to timber structures due to their advantages of a reliable connection and convenient operation. Have the bolt loosening were based of onstructures the overlapping of steel structures, and fewasattempts the failure the of bolted connections of timber structures, Zhang [29] studied the tensile beenAiming made toatinvestigate bolt loosening analysis of structures facing anisotropic materials such properties as wood. WoodInand change preload process force were analyzed, the effects of transverse load amplitude, thisthe paper, the of loosening of the bolted and connection in the timber structure under the frequency, position, and on loosening compared. Wood and steel bolts, when the bolts are rotated, it often means that the wood has deformed and the study of the looseness of bolted connections of wooden structures was based on the loosening failed.
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