Design And Seismic Analysis Of The New Bisected Replaceable Steel Coupling Beam

Coupling beams in coupled walls structure need not only to have sufficient strength and stiffness to restrain walls of both sides, but also provide another more important role for the overall structure which dissipating a large number of earthquake energy to avoid piers suffered serious damage. As the first line of defense of coupled walls structure, it will be favorable safety to overall structure when coupling beams dissipate the more energy. Therefore, it is necessary to seek a design way of coupling beams to improve the seismic performance of coupled shear wall structures, and it can be taking account into the recovery of building using function fast, conveniently and economically after the earthquake. It has important practical significance to the shear wall structure.Based on previous studies, this paper proposes a new design scheme of replaceable steel coupling beams, and carries on the theoretical analysis on the parameters of model steel coupling beams. The thickness of steel coupling beam energy dissipating plate are taken as variables, the corresponding structure models are established by finite element analysis software ABAQUS, the hysteresis curve, skeleton curves of the structure are compared and analyzed. Finally through comprehensive comparison show that: the structure has better ductility, seismic performance, and higher ultimate bearing capacity when the range of energy consumption in the cross-sectional area and beam web section area ratio is 1.7 ~ 2.6, under the premise of the value of strength of steel of the energy dissipation plate and beam is Q235 and Q345.In order to explore the influences of long span ratio on the equivalent stiffness of piers, steel coupling beams are set up eight different long-span ratios under the premise of the optimal thickness of energy board and the remaining parameters remaining unchanged. Their modelings and analysis are used by the same method, then make comparative analysis of displacement-time curve in the same concentrated loads. Research shows that the equivalent lateral stiffness of structure is not decreases strictly with the long beam span ratio decreases.The paper makes comparative analysis of finite element simulation between new type of replaceable steel coupling beams and the traditional reinforced concrete coupling beams. Research shows that the proposed new replaceable steel coupling beams not only improve the seismic performance, ultimate bearing capacity, lateral stiffness of coupled walls structure, but also the vibration period of structure tends to increase and improve the additional damping ratio of structure. When the energy board has large plastic displacement under the action of external force, it can be conveniently replaced to restore the function of building, and the maintenance cost of the structure in the life cycle of the structure is reduced.