Seismic Performance Research Based On The Ductility Of Concrete Shear Wall Coupling Beam

Coupling beam is the first seismic defense of shear wall structure, and its performance directly affects the seismic capacity of the whole structure. Improving the ductility of coupling beam can fully dissipate earthquake energy and reduce wall limb by earthquake action, so it is crucial to study the coupling beam seismic based on ductility. This article is mainly about the ordinary reinforcement and diagonal inclined reinforcement coupling beam which is extensive used in engineering, study its performance under repeated load and provide the basis for the seismic design method based on ductility.Considering span-depth ratio, shear-compression ratio, band ratio, reinforcement and stirrup characteristic value and other factors, this article use ABAQUS to do the simulation analysis on 22 diagonal inclined reinforcement coupling beams and 18 ordinary reinforcement coupling beams. Then study its bearing capacity, crack development hysteresis, ductility and failure characteristics under repeated loading conditions. Do theoretical analysis of the coupling beam and the establish calculation formula between ductility and influencing factors. Collect total 67 experimental data of coupling beam from 4 research institutions for verification, put forward design suggestions under various seismic of coupling beam based ductility. The main conclusions are:(1) Span ratio, stirrup characteristic value, form and shear reinforcement ratio are the main factors influenced the coupling beam ductility performance and bearing capacity.(2) Increasing span-depth ratio and improve the stirrup dosage can improve the growth of cracks and failure characteristics, which helps to improve the ductility of coupling beam.(3)Increase the dosage of stirrup can improve the constraints of the role of concrete and delay its crushing spalling, significantly improve the ductility performance and bearing capacity of the beam.(4) At small span-depth ratio(χ≤2), adding cross reinforcement can change the component force form, give full use of the reinforcement, thus improve the bearing capacity and ductility of coupling beam.(5) The calculation formula between ductility and factors which is derived by regression and theoretical analysis is reliable verified by experimental comparison.(6) Put forward seismic design suggestions formula 5.2 and 5.3 of coupling beam based on ductility under the various seismic.