| The self-centering frame structure mostly relaxes the connection constraints of specific key parts of the structure,thereby eliminating the residual deformation caused by yield energy dissipation of structural components,reducing the repair time of the structure,and improving the recoverability of the structure.However,most self-centering frame structures do not consider the influence of floor slabs,due to the "beam expansion" mechanism,the opening of beam and column joints will destroy the floor slab,and the presence of floor slabs will also limit the opening and closing of beam and column joints.In view of this phenomenon,this paper innovatively proposes a self-centering steel frame structure with limited displacement energy dissipation of the floor slab,which connects the floor slab and the frame with energy-dissipating connecting members,so that the floor slab can produce limited displacement relative to the frame system,so as to adapt to the opening and closing mechanism of beams and columns,improve the damage of the floor in the self-centering frame,and at the same time dissipate seismic energy,and concentrate the damage of the structure in the replaceable energy-dissipating connecting members.The main research contents of this paper are as follows:Firstly,a self-centering steel frame structure with limited displacement energy dissipation of the floor slab is proposed,which explains the structural form,energy consumption and self-centering principle of the structure,and calculates the performance of the structure.Secondly,the proposed new self-centering steel frame structure model is established in ABAQUS,which explains the mechanical properties of the materials used,the dimensions of structural components and the establishment process of the finite element model.Through experiments with high simulation correlation and complete data,the results with high similarity with the original text were obtained,which proved the effectiveness of the model and numerical simulation method.Thirdly,the model of the traditional steel frame structure is established separately,and the self-centering steel frame structure with different initial prestress values,different number of energy-dissipating parts and limited displacement of energy-dissipating angle steel is applied.Their performance data such as hysteresis curve,skeleton curve,residual deformation,stiffness degradation,energy dissipation coefficient,ductility coefficient,energy dissipation area per load and cumulative energy dissipation area were obtained,and analyzed and compared.Finally,through numerical simulation,it is concluded that the new self-centering steel frame structure proposed in this paper has good energy consumption and reset ability,which realizes the design purpose of floor loss-free,and summarizes the influence of prestress size and number of energy-dissipating parts on the performance of the structure,as well as the performance changes when using other energy-dissipating components. |
