Self-centering ability of unbonded post-tensioned precast concrete shear walls has been attributed to the presence of post-tensioning force. However, the experimental results presented in this paper indicate that the post-tensioning force may completely die out during cyclic loading while the walls are able to retain their superior self-centering characteristic. Moreover, the analytical study presented in this article indicates that with proper configuration of end-anchorages for post-tensioned tendons, self-centering of post-tensioned walls can be achieved even when the post-tensioning force vanishes. This study also investigates the effects of tendon layout, tendon end-anchorage configuration, and external vertical load on the self-centering ability of unbonded precast concrete shear walls subjected to earthquake loading.
Bibliographical noteFunding Information:
This work was supported in part by Precast/Prestressed Concrete Institute (PCI) through a Daniel P. Jenny Fellowship and by the Department of Civil Engineering at the University of Minnesota through a Sommerfeld Fellowship. The authors wish to thank Professor Yahya Kurama from the University of Notre Dame for providing the modified DRAIN-2DX code and his advice on its use.
- Permanent Drift
- Precast Concrete
- Seismic Loading
- Shear Walls
- Unbonded Tendons