| Traditional steel structures have problems such as large residual deformation after earthquakes,difficulty in repairing after earthquakes,and high repair costs.In order to solve the above problems,based on the analysis of Chinese and foreign documents,based on the concept of self-resetting and the existing mechanism of self-resetting of structures,this paper proposes A damper based on a pre-compressed disc spring that can simultaneously realize staged energy consumption and self-reset.The damper uses a disc spring to replace the traditional pre-stressed tendons and steel strands for self-reset.With the assistance of dampers,it aims to improve the seismic performance of the structure,reduce the huge economic loss caused by the earthquake and the cost of post-earthquake repair,and provide new design ideas for multi-storey buildings.The main research contents of the thesis are as follows:Firstly,a new type of pre-compressed disc spring self-resetting damper with staged energy consumption and a self-resetting steel frame joint based on the damper is proposed.Then analyze the mechanical performance of the damper through finite element simulation,investigate the staged energy dissipation capacity and self-reset capability of the damper,and propose the design and assembly method of the steel structure node based on the damper,and verify the node through theoretical formula derivation The mechanical properties in normal use and earthquake conditions provide a basis for the finite element analysis of the subsequent verification nodes.Next,establish a new self-resetting node model and a traditional steel structure node model in ABAQUS,extract the hysteresis curve,skeleton curve,residual deformation curve,stiffness degradation curve and energy dissipation coefficient curve of the two nodes through finite element simulation,and pass the curve Analyze the mechanical properties of the two types of nodes in earthquakes,and investigate the energy consumption and selfreset capabilities of the new self-resetting nodes.The results show that the energy dissipation capacity and self-resetting ability of self-resetting nodes based on precompressed disc springs are better than those of traditional steel structure nodes,which can effectively reduce the residual deformation of the structure and improve the bearing capacity of the structure.Finally,the influence of different factors on the self-reset ability of the node is explored,including four factors: disc spring preload,disc spring stiffness,damper energy dissipation material,and damper position.The results show that appropriately increasing the preload of the disc spring can effectively increase the bearing capacity of the joint and enhance the self-reset ability of the structure;different energy dissipation materials will affect the energy dissipation capacity of the joint and the bearing capacity of the joint;place the damper in the The joints and inverted points have a great influence on the bearing capacity of the structure. |
