A PERFORMANCE-BASED SECTION DESIGN METHOD OF A SELF-CENTERING CONCRETE SHEAR WALL WITH DISC SPRING DEVICES

A self-centering reinforced concrete (RC) shear wall with disc spring devices is mainly composed of a wall system and disc spring devices at the foots of the wall. The disc spring devices are featured by high compression and can return to its initial form after the load is removed. The disc spring devices can provide restoring force and reduce the residual deformation for the wall system after earthquake. To better design the self-centering RC shear wall with disc spring devices, the performance-based section design method was proposed. The structural four-level performance objective and damage state were defined. The sectional dimensions of the shear wall, the geometric size, bearing capacity and deformation capability of the disc spring devices were determined so that the structure can be used normally after earthquakes. The theoretical calculation method of bearing capacity for the self-centering RC shear wall with disc spring devices was proposed based on sectional forces analysis. The elasto-plastic analysis of the designed self-centering RC shear wall with disc spring devices was finally carried out. Results indicate that the self-centering wall designed by using the proposed method showed good self-centering capability, and its damage was also effectively controlled. The residual displacement ratios were 0.012% and 0.022% and damage indices were 0.12 and 0.22, respectively, at 0.5% and 1% drift ratios, which met the performance-based design goal. The bearing capacity of the self-centering wall was well evaluated through the design method, and the values were in good agreement with the simulation results obtained from the finite element model.