| With the increasing number of high-rise and super high-rise buildings,various energy-consuming components have been fully utilized and utilized.According to the research team’s previous research on steel plate shear walls and anti-buckling braces(BRB),it is found that the steel plate shear wall produces a series of tension bands similar to diagonal braces under horizontal load.The formation of the tension band increases the steel plate shear wall The bearing capacity of the steel frame has improved the energy dissipation capacity of the steel frame,but the steel plate shear wall has less stress in the areas on both sides of the tension belt,and the material performance has not been fully utilized;the anti-buckling support,as an energy dissipation member,has a high bearing capacity and is The force process has the characteristics of only yielding but not buckling.Therefore,the anti-buckling support and the steel plate shear wall are combined to propose an anti-buckling combined support system with ductile shear energy-dissipating steel plate,so that the supporting system can fully exert its energy dissipation performance during the earthquake.The new support system should ensure that the anti-buckling support does not deform during the loading process.Only the steel plate support is damaged to a certain extent,which can enable the building to achieve the purpose of assembly during the construction process,and exhibits the advantage of being replaceable during post-earthquake repair.In order to explore the feasibility of the anti-buckling composite support of the energy-dissipating steel plate with ductile shear and the bearing capacity,initial stiffness,ductility and other mechanical properties of the support system under unidirectional load and the bearing capacity of the specimen under cyclic load,Stiffness degradation law,energy consumption capacity and other properties,respectively designed 26 finite element models and 5 test specimens for the following exploratory research:(1)Establish a 26 finite element models,divide it into 6 groups with the thickness of the steel support shear plate,the width and thickness of the steel support flange,the support height and thickness of the steel plate,and the length of the BRB as parameters,and change the parameters The load capacity,initial stiffness and ductility of the model under unidirectional load are studied,and the hysteresis curve,stiffness degradation law and equivalent viscous damping ratio development of the model under cyclic load are analyzed.Summary of the development of energy dissipation steel plates with ductile shear The mechanical properties,energy dissipation capacity and stress development law of the anti-buckling composite support.It is found that the new steel plat e composite support structure system is feasible as a lateral force member.The factor that has the greatest impact on the mechanical properties of the specimen’s bearing capacity,stiffness,ductility and energy dissipation capacity is the thickness of th e shear plate supported by the steel plate.The thicker the thickness The better the load-bearing capacity,rigidity and energy dissipation capacity;although the change in the width of the steel plate support flange has no significant effect on the later load-bearing capacity and energy dissipation capacity of the new composite support structure system,the increase in the flange extension width will slow down the tensile force of the structure Sudden change of stiffness during belt formation;the thicknes s of the flange of the anti-buckling composite support with ductile shear energy dissipation steel plate increases(that is,the height-to-thickness ratio of the flange decreases),and the stiffness of the specimen when the displacement angle between layer s is less than1/150 And the load-bearing capacity will be improved to a certain extent,but when the displacement angle between layers is greater than 1/150,the stiffness and load-bearing capacity of the specimen tend to be the same,and as the flange th ickness increases,the height-to-thickness ratio decreases,and ductile shear energy consumption The energy dissipation capacity of the anti-buckling composite support of the steel plate is reduced;the anti-buckling composite support of the ductile shear energy-consuming steel plate can change the height of the steel plate support under the premise of ensuring the same width of the steel plate support,so that the BRB centerline spacing can be increased.Effectively improve the ductility and energy consumption capacity of the new type of composite support,but when the height of the steel plate support of the new type of steel plate composite support remains unchanged,reducing the aspect ratio of the steel plate support will increase the load-bearing capacity and initial stiffness of the model.The ductility and energy consumption of the support tend to decrease to varying degrees.(2)According to the finite element model,design 5 replaceable steel plate supporting shear plate thicknesses of the anti-buckling combined support test specimen with ductile shear energy dissipation steel plate,and use the MTS actuator to load the specimen cyclically and analyze The hysteresis curve and the stress development and displacement changes of key parts of specimens w ith different thicknesses during cyclic loading are analyzed,and the peak load of the corresponding specimens is analyzed to analyze its bearing capacity,stiffness and energy dissipation capacity.The study found that during the formation of the tensile bands on the shear plate of the anti-buckling composite support with ductile shear energy dissipation steel plates,the stiffness of the specimens changes to varying degrees.During the process of the tensile bands staggered,the specimen buckling consumes energy.The load-bearing capacity of the test piece will gradually decrease after wrinkles are formed on the cutting board and gradually cracked,and the load-bearing capacity and energy consumption capacity of the test piece will decrease correspondingly as the loading displacement of the test piece increases.At the same time,comparing the steel plate shear wall specimens,it is found that the energy dissipation capacity of the anti-buckling composite support with ductile shear energy dissipation steel plate is better than that of the steel plate shear wall structure within a certain structure and the range of loading displacement.(3)Establish 3 finite element models that are the same as the test specimens,and compare the hysteresis curves,skeleton c urves,stiffness degradation curves and equivalent viscous damping ratio curves of the two under cyclic loading to verify the finite element simulation Reasonability and reliability.It is found that the finite element simulation has simplified the boundar y conditions,loading methods,material properties and connection methods of the test specimens to different degrees,so the two have different degrees of mechanical properties such as load-bearing capacity and stiffness.However,the law of change is the same,that is,the finite element simulation data is reliable.(4)After research,it is found that the equivalent viscous damping ratio of the new steel plate composite supporting structure system is in the range of 0.2 to 0.4,which is greater than the "Code for Seismic Design of Buildings" stipulates that the structural damping ratio of steel structure buildings is less than 50m,which is much larger When the height of the building is greater than 200m,the steel structure has a damping ratio of 0.02,which belongs to the range of large damping ratio specified by the code.Therefore,the new type of steel plate composite support has a better energy consumption capacity. |
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