Nonlinear static and dynamic behaviors assessment of self-centering post-tensioned concrete wall with multiple-slit device

Abstract

Conventional seismic force-resisting systems usually experience significant structural damage, and repairing such buildings is not economical. A new type of seismic force-resisting system is self-centering Post-Tensioned Concrete Wall (PT-CW), in which vertical Post-Tensioned (PT) cables supply the return force of the structure to its initial state. This study is dedicated to investigate the seismic behavior of the self-centering PT-CW system using nonlinear static, cyclic, and response history analyses. The loading and design of the studied buildings are performed in the 3D model, then one of the frames is selected and the nonlinear analyses are done in OpenSees software. In order to increase the absorption energy of PT-CW, a Multi-Slit Device (MSD) is employed. For this purpose, three systems including PT-CW with Energy Dissipators (ED) bars, PT-CW with MSD, and traditional Concrete Shear Wall (CSW) are modeled in Opensees software. These seismic force-resisting systems are applied into three, six, and ten-story buildings. To validate the proposed models, the results of an experimental study are applied. Then, the nonlinear responses of the introduced models are numerically obtained as well. Accordingly, the PT-CW with MSD has more ductility and less strength drop than the other two systems. Finally, ten far-field earthquake records are selected and scaled with the ASCE spectrum to implement NRH analysis. As a result, it is observed that the story drift of the PT-CW with MSD under the applied earthquake records is almost uniform and less than the PT-CW with ED bars.