PARAMETRIC DESIGN AND HYSTERETIC BEHAVIOR STUDY OF SELF-CENTERING COUPLED SHEAR WALL WITH EMBEDDED DISC SPRINGS

A self-centering coupled shear wall (SC-CSW) with embedded disc spring device, which can well reduce the residual deformation and effectively prevent the damage of the coupling wall of structures during earthquakes, is developed and designed. The seismic energy is mainly dissipated by friction and the restoring force is provided by disc springs in SC-CSW. The finite element models of SC-CSW1 with a pre-pressed force less than friction, of SC-CSW2 with a pre-pressed force larger than friction, and of the general coupled shear wall are built. And the comparisons of bearing capacity, deformation capability, energy dissipation and self-centering capabilities among SC-CSW1, SC-CSW2 and the general coupled shear wall are conducted. The results indicate that the accumulative energy dissipation of SC-CSW1 is reduced by 28.03%, compared with the geneal coupled shear wall when the loading displacement exceeds the limit of elasto-plastic interstory displacement, while its ductility is increased by 2.94 times at least than that of the geneal coupled shear wall. Therefore, the SC-CSW1 can better meet the displacement requirements under strong earthquakes. The accumulative energy dissipaton of SC-CSW2 is reduced by 15.83%, compared with SC-CSW1, but its bearing capacity is increased and the maximum residual displacement ratio is only 0.09%. The residual deformation of SC-CSW2 is basically eliminated, which can meet the earthquake-resilient demands of structures.