| The development of fabricated steel structure construction is conducive to promoting the transformation and upgrading of the construction industry and modernizing the construction industry.In order to improve the seismic performance of fabricated steel structure combined with energy dissipation and shock absorption technology,a fabricated friction energy dissipation composite wall panel was proposed,and its theoretical calculation and finite element parameter analysis were carried out.The main research contents and achievements are as follows:(1)A friction energy absorbing composite wall panel suitable for a fabricated steel structure is proposed,which is composed of an energy-consuming support with a friction hinge and a lightweight inner and outer wall panel.When the main structure generates elastic interlayer displacement under wind load and multiple earthquakes,the friction energy dissipation wall plate works together with the structure and provides anti-side stiffness,which is beneficial to the deformation control of the structure under normal use conditions.When the main structure is subjected to eccentric earthquake displacement and the elastic-plastic interlayer displacement occurs,the energy-consuming wall panel provides damping and energy consumption through the rotation of the friction hinge,which can reduce the seismic response of the main structure under strong earthquake.(2)The main force-consuming component of the assembled friction energy-consuming composite wall panel is friction energy-consuming support,which is composed of a quadrilateral energy damper connected by a friction hinge and a supporting diagonal rod.After the initial rotation of the friction hinge,since the quadrilateral damper becomes longer along the diagonal direction of the tension and becomes shorter along the diagonal direction of the pressure,the pressure-supporting slanting rod will not be subjected to buckling deformation due to the pressure.The assembled frictional energy-consuming composite wall panel maintains the tensile and compressive behavior when subjected to the reverse load,and the strength and rigidity of the frictional energy-consuming wallboard are not degraded,and thehysteretic performance is stable.(3)According to the principle of virtual work,through the micro-element analysis,the friction bending moment,the force of the member,the initial lateral stiffness and the energy dissipation capacity of the friction-energy composite wall panel are analyzed,and the calculation formula is obtained.The formula shows that the rotating bending moment of the friction hinge is proportional to the friction coefficient of the friction pad,the pre-tightening force applied to the high-strength bolt,and the inner diameter of the friction pad.The turning moment will increase as the friction factor radius factor increases.The strength,initial lateral stiffness and energy consumption of the friction energy-consuming wallboard are related to the frictional bending moment of the friction hinge and the geometrical characteristics of the energy-consuming linkage.(4)Considering the friction contact and geometric nonlinearity,the finite element analysis model of the friction energy dissipation wall panel is established.By comparing the strength and stiffness of the model under unidirectional loading with the calculated values of the theoretical formula,it is verified that the finite element model has good accuracy and reliability,and can be used to analyze the relevant parameters of the friction energy dissipating wallboard.(5)Based on the finite element model of variable parameter analysis,the strength of the frictional energy-consuming wallboard under monotonic loading is analyzed.The influence of the size of the gasket,the pre-tightening force of the bolt and the length of the energy-consuming connecting rod on the horizontal shear capacity of the frictional energy-consuming wallboard is analyzed systematically.It is found that the frictional load capacity of the frictional energy-consuming wallboard is greatly affected by the rotational bending moment and the length of the energy-consuming connecting rod.(6)Based on the finite element model of variable parameter analysis,the initial lateral stiffness of the frictional energy-consuming wallboard under monotonic loading is analyzed.The influence of the bending moment,the length of the energy-consuming connecting rod and the bending stiffness of the energy-consuming connecting rod on the lateral stiffness of the friction-consuming wall panel is analyzed systematically.It is found that the lateral stiffness of the fabricated energy-consuming wallboard increases with the increase of the rotationalbending moment;the stiffness of the friction-consuming wallboard decreases with the increase of the length of the energy-consuming connecting rod;As the bending stiffness of the rod increases,the stiffness of the frictional energy-consuming wallboard increases accordingly.After the bending stiffness of the energy-consuming connecting rod increases to a certain value,the rigidity of the wallboard does not change.(7)Based on the finite element model of variable parameter analysis,the energy dissipation capacity of the frictional energy-consuming wallboard under the reciprocating load is analyzed.The influence of parameters such as friction washer size,high-strength bolt pre-tightening force and energy-consuming link length on the energy consumption of friction energy-consuming wallboard is analyzed systematically.It is found that the hysteresis performance of k=1.5,P=120 kN and a=1200 mm Assembly energy-consuming wall panels is better.(8)According to the theoretical calculation formula and the results of finite element numerical analysis,the design method of assembled friction energy dissipation wallboard is proposed. |
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