Research On Design Method And Seismic Performance Of Assembled Anti-Buckling Steel Plate Energy-Dissipation Coupling Beam

Prefabricated structures have the advantages of improving construction quality and speeding up the construction progress.Besides,prefabricated structures are more environmentally friendly than the traditional reinforced concrete structures.Consequently,they are becoming more and more widely used.However,prefabricated structures can hardly be equal to the cast-in-place concrete structures in strength and stiffness and are not suitable for areas of high seismic intensity.In order to improve the seismic performance of the prefabricated structure,it is necessary to add energy dissipation members in the structure to reduce the response of the structure under earthquake.In this paper,an assembled anti-buckling steel plate energy-dissipation coupling beam was proposed,which can satisfy both stiffness and energy dissipation capacity.The design method and seismic performance of the assembled buckling-restrained coupling beams were studied.The specific contents are as follows:In order to solve the problem of poor ductility of reinforced concrete coupling beams,a new kind of assembled anti-buckling steel plate energy-dissipation coupling beam was proposed by introducing energy-dissipation and load-bearing steel plate into the coupling beams based on the concept of buckling-restrained steel plate shear wall.The construction features of the coupling beams were described in detail.The force mechanism of the assembled anti-buckling steel plate energy-dissipation coupling beam was analyzed from the aspect of the mechanics analysis and the design principles and simplified design methods of the main components of the coupling beam were given.Based on relevant codes,the design formula for the bearing capacity of the assembled anti-buckling steel plate energy-dissipation coupling beam were also presented.A numerical simulation method was used to study the mechanical properties of the new-type coupling beam.The effects of different parameters of the main components on the bearing capacity and energy dissipation capacity of the coupling beam were analyzed in detail.According to the results of parameter study,the main parameters affecting the mechanical properties of the coupling beam were defined,which can provide advice for the design of the assembled anti-buckling steel plate energy-dissipation coupling beam.By comparing the bearing capacity and energy dissipation capacity of the traditional steel-concrete composite beam and the assembled anti-buckling steel plate energy-dissipation coupling beam,it can be concluded that this new kind of coupling beam hasexcellent mechanical properties.It contains two energy-dissipating components,i.e.energy-dissipation and load-bearing steel plate and steel plate damper.Both of them can yield under earthquake,which increases the energy-dissipating capacity of the connecting beam and solves the problem of insufficient energy-dissipating of the reinforced concrete connecting beam.For a traditional multi-story reinforced concrete frame-core structure,some of the coupling beams of the original structure are replaced by the assembled anti-buckling steel plate energy-dissipation coupling beam proposed in this paper.Two replacement strategies of coupling beams were designed.The seismic responses of the original structure and the structures with this new kind of coupling beams were analyzed by using a structural analysis software.Compared the base shears,inter-story drifts,structural damage degrees and energy dissipation capacities of the structures with this new kind of coupling beam with those of the original structure,it can be found that replacing the coupling beams of original structure with this new kind of coupling beam can effectively reduce the maximum inter-story drift of the structure,enhance the ductility and energy dissipation capacity of the coupling beams,and reduce the damage of share wall.Therefore,the vertical members of the structure which are the main load-bearing members can be protected and the seismic performance of the structure is improved.