Effects of unbonded steel layout on seismic behavior of post-tensioned precast concrete shear walls
- PDF / 2,843,099 Bytes
- 23 Pages / 439.37 x 666.142 pts Page_size
- 53 Downloads / 284 Views
Effects of unbonded steel layout on seismic behavior of post‑tensioned precast concrete shear walls Bulent Erkmen1 Received: 30 May 2020 / Accepted: 14 October 2020 © Springer Nature B.V. 2020
Abstract Unbonded post-tensioned precast connections have been studied widely in various applications and shown to be promising seismic resisting systems with superior seismic performance including exceptional self-centering capability and minimized structural damage. In this paper, effects of unbonded post-tensioned steel layout of precast concrete shear walls on seismic performance of a typical five-story precast concrete parking garage structure with the walls being the only lateral load resisting system is studied. The seismic behavior of the walls is determined using static nonlinear push-over, cyclic, and nonlinear timehistory dynamic analyses under both the design and survival level ground motions. Three prototype unbonded post-tensioned precast concrete shear walls are designed with different unbonded post-tensioning steel tendon layout. Roof drift, post-tensioning force, and base shear and normal forces at the wall-foundation horizontal joint are monitored, and the demand for the coefficient of shear friction along the horizontal joint is calculated. The results show that seismic behavior of unbonded post-tensioned precast shear walls, in particular, maximum building drift, permanent losses in post-tensioning steel force, and coefficient of shear friction, is significantly influenced by layout of unbonded post-tensioned steel. The results and findings presented are valuable to improve design guidelines and provide a useful reference for practical applications of unbonded post-tensioned precast concrete connections in seismic applications. Keywords Unbonded post-tensioned · Shear wall · Steel layout · Coefficient of shear friction
1 Introduction There has been a steady increase in both experimental and analytical research focusing on developing high-quality precast concrete structural systems and connections for regions of high seismic risk. Precast concrete structures designed as non-emulative systems also known as jointed construction have been shown to be more cost-competitive and have superior seismic performance in limiting structural damage. A precast concrete shear wall * Bulent Erkmen [email protected] 1
Department of Civil Engineering, Ozyegin University, Istanbul, Turkey
13
Vol.:(0123456789)
Bulletin of Earthquake Engineering
system based on jointed construction and referred as unbonded post-tensioned precast wall has particularly received much attention especially after PREcast Seismic Structural Systems (PRESSS) program (Priestley et al. 1999). The program experimentally tested precast concrete beam-column connections where the beams were connected to columns by post-tensioned tendons. It was shown that seismic performance of the connection improves significantly when the post-tensioned tendons are placed inside oversized ducts and left unbonded, a hypothesis that was recommended
Data Loading...
