| Coupling beam is the main coupling wall-beam,and is widely used in the shear wall structure of high-rise buildings.All the energy dissipation of coupling beam and the ability to withstand deformation directly determine the safety of the coupling beam.Coupling beam is divided into small span according to the size of small span beam and general coupling beam,the general beam in high-rise shear wall structure application is less,the most widely used or small span beam,small span beam Compared with the general beam has a lot of advantages,in the ductility and deformation performance and ability to resist load performance outstanding.From the 1960 s to the present,there have been too many studies on the beam-to-height ratio beam,and many new structural forms have appeared.However,there are some problems in the aspects of reinforcement,construction extension,ductility and energy dissipation.More or less.Therefore,in order to improve the ductility and energy dissipation capacity of the coupling beam,on the basis of the study of the equal-limb double-link beam,the idea of the unequal-limb double-link beam is put forward from the structural form,but its seismic performance needs to be further studied and Demonstration.According to the finite element method of ABAQUS finite element method,the coupling beam model of 0.75,1.0 and 1.25 small span-height ratio is designed and established.The seismic performance of the composite was studied at different angles.According to the different sizes of the left and right wall,a total of six kinds of wall limb distribution(five unequal limb coupling beam and one isometric limb double beam)were set respectively.The peak load,the maximum relative displacement angle,the stiffness variation and the equivalent viscosity of the unequal-limb doublegirder and the equal-limb double-girder are compared and analyzed with the three different span-height ratios.And then compare the carrying capacity,deformation capacity,ductility and energy dissipation capacity of each model component.Are to find a most appropriate ratio of span and the most appropriate around the limb,so that the beam has better than ordinary twin-beam ductility and energy consumption.Research shows:(1)In the same span ratio,the unequal-limb double-girder exhibits better ductility and energydissipating capacity than the double;(2)The seismic performance of the coupling beam decreases with the increase of span height ratio;(3)When the span-height ratio is 0.75,the model CB-1-3 with the length 0.5625 m,the left-side wall limb 2.0m,and the right-side wall limb 1.4m is the best-;When the span-height ratio is 1.0,the model CB-2-3 with the length of 0.75 m,the left-side wall of 2.0m and the right-side wall of 1.4m shows excellent ductility;when the span-height ratio is 1.25,CB-3-3,which is 0.9375 m in length,2.0m in the left and 1.4m in the right,exhibits excellent energy dissipation;(4)The comparative analysis of the three cantilever beams with different span-height ratios shows that the CB-1-3 is the double-jointed beam with the best seismic performance. |
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