Seismic Performance of a 3D Precast/Post-Tensioned Reinforced Concrete Sub-Structure under Bi-Axial Loads

Abstract eng:
The precast and post-tensioned structures can be designed to have self-centering function that minimizes permanent drift after an earthquake. The self-centering function is achieved through the post-tensioned strands in the precast beams that allow the gap-open in the beam-column interface during earthquakes. Literatures have proved that the self-centering was effective for the beam-column connections. In real structure, there are floors that usually designed as a rigid diaphragm to transfer the seismic loads between gravity and moment-resisting frames; it may limit the gap-open in the beam-column interface of the self-centering structures. Therefore, a new design of the floor system that also has self-centering features is proposed. In order to investigate the self-centering function in real structure, a one-story 3D precast and post-tensioned sub-structure was constructed and tested. The tested specimen consists of four columns, four beams and one slab, representing one gravity frame, one moment resisting frame and the floor system that connects both frames. This test aims to investigate the force transfer by the floor slab as well as the seismic performance of the structure, in which the gaps in the beam-column and beam-floor interfaces may be opened in two directions, when subjected to bi-axial lateral loads. The investigated parameters include the prestress applied in the transfer beams that connected gravity and post-tensioned frames, installation of the energy dissipating steel angles in the post-tensioned frame and loading compositions.

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