The Wind-Resistant Research Of Torsional Viscoelastic Damper On The Rural Wood Structure

Wind-resistance design for low-rise buildings in rural areas mainly employs experiment or numerical simulation method to research wind pressure distribution, and then some construction measures are put forward to improve the performance of the structures. However, damper is rarely applied to resistant wind load for low-rise buildings. Besides, the restoring force model of mortise and tenon joint is usually considered as linear elasticity rather than plasticity in the existing simulation of wood structures, which is very different from the actual situation. In view of this, as low-rise wood buildings have collapsed under the strong wind, in this paper, the shear-rotation viscoelastic damper is introduced to low-rise wood structure to resist wind load.The paper?states the construction and failure mechanism of the wood structure. It introduces the failure mode, mechanical model and the finite element method of mortise and tenon joint. Then it introduce the way that construct the finite element model of the wood structure and the plastic deformation of mortise and tenon joint at the same time. This paper describes the basic theory of viscoelastic damper and the mechanical model of shear-rotation viscoelastic damper that is chose.Through similarity criterion to deal with the existing experimental data of mortise and tenon joint, we get restoring force curve of the mortise and tenon joint. By the harmonic superposition method to simulate the wind, the shear-rotation viscoelastic damper is verified to have great effect on the vibration control of the wood structure under wind load. The results show that considering nonlinear node, the story drift of wood structure without damper decreases greatly. Hence, the nonlinear node should be considered when we analysis the wood structure with dampers. The results show that the energy dissipation of damper deduced, but the reduction ratios are not affected by the nonlinear node. Therefore, the shear-rotation viscoelastic damper can effectively reduce the response of wood structure under strong wind, and has great value in engineering application for the protection of the wood structure.Chapter 4 studies the effects of the parameters, position, and number of shear-rotation viscoelastic dampers on the wood structure. The results show that vibration reduction radios increases as the radius and the layer raises. However, the thickness of the viscoelastic material has bad effect on wood structure. The position of damper does not affect the vibration reduction radios for symmetric structure. Besides, with the increasing of the number of dampers, the vibration reduction radios rises. Finally, by the relation curve between wind speed and angular displacement of nodes, we define the yield of angular displacement as control target. And the general steps of vibration reduction method for rural wood structure are offered.