Experimental study of shape memory alloy connection in precast concrete shear walls for seismic applications
department or school: Applied Science, Faculty of
department or school: Engineering, School of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Saud, Deepak
issued: 2024-10-07T19:04:17Z
issued: 2024
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: The jointed post-tensioned Precast Concrete (PC) shear walls are designed to rock around their base and self-center themselves upon unloading. One way to enhance ductility is by allowing controlled rocking at the wall-to-foundation connection using unbonded Post-tensioning (PT) tendons and mild steel rebars as energy dissipators in PC shear wall buildings. However, this jointed connection system is complex to build and time-consuming. Also, the jointed connection with grouted metal duct connections with deformed steel rebar as dowel rebar has limited ductility. A particular unknown exists about the force deformation capacity of grouted dowel connection. This thesis aims to investigate the local behavior of the PC wall through a novel connection using shape memory alloy (SMA) rebar and couplers. The study started with a numerical study to investigate the effects of various parameters (aspect ratio, axial load ratio, rebar types, and vertical reinforcement ratio) on the seismic response of the concrete shear walls reinforced with SMA bars at the base. Fifty-four finite element models of the RC walls reinforced with SMA rebars and steel were developed. The results were analyzed to evaluate the seismic behavior of SMA RC walls, which improved the understanding of SMA PC walls. Additionally, four coupler pullout tests and seven pullout tests of rebar in concrete blocks were carried out to investigate the effectiveness of the anchorage of the SMA rebar connected with the coupler and surrounding grout within a metal duct. The test results ensured the rebar was stressed beyond the superelastic strain range with very low slippage. Finally, three small-scale wall-to-wall connection test specimens were constructed and tested under monotonic loading to investigate the force-deformation response of the proposed anchoring system for SMA-reinforced PC wall-to-wall intersections. The result shows that specimens with the proposed connection consisting of SMA and couplers present hig…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/89343
note: EXPERIMENTAL STUDY OF SHAPE MEMORY ALLOY CONNECTION IN PRECAST CONCRETE SHEAR WALLS FOR SEISMIC APPLICATIONS by Deepak Saud B.Tech., Motilal Nehru National Institute of Technology, 2012 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF APPLIED SCIENCE in THE COLLEGE OF GRADUATE STUDIES (Civil Engineering) THE UNIVERSITY OF BRITISH COLUMBIA (Okanagan) October 2024 © Deepak Saud, 2024 ii The following individuals certify that they have read, and recommend to the College of Graduate Studies for acceptance, a thesis entitled: EXPERIMENTAL STUDY OF SHAPE MEMORY ALLOY CONNECTION IN PRECAST CONCRETE SHEAR WALLS FOR SEISMIC APPLICATIONS submitted by Deepak Saud in partial fulfillment of the requirements of the degree of Master of Applied Science. Dr. Lisa Tobber, School of Engineering Supervisor Dr. M. Shahria Alam, School of Engineering Co-Supervisor Dr. Ahmad Rteil, School of Engineering Supervisory Committee Member Dr. Qian Chen, School of Engineering Supervisory Committee Member Dr. Mohamed Shehata, School of Engineering University Examiner iii Abstract The jointed post-tensioned Precast Concrete (PC) shear walls are designed to rock around their base and self-center themselves upon unloading. One way to enhance ductility is by allowing controlled rocking at the wall-to-foundation connection using unbonded Post-tensioning (PT) tendons and mild steel rebars as energy dissipators in PC shear wall buildings. However, this jointed connection system is complex to build and time-consuming. Also, the jointed connection with grouted metal duct connections with deformed steel rebar as dowel rebar has limited ductility. A particular unknown exists about the force deformation capacity of grouted dowel connection. This thesis aims to investigate the local behavior of the PC wall through a novel connection using shape memory alloy (SMA) rebar and couplers. The study started with a numerical study to investigate the effects of various parameter…
has type: Thesis/Dissertation
date issued: 2024-11
is shown at: 10.14288/1.0445505
language: eng
degree discipline: Civil Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
contributor: Tobber, Lisa
contributor: Alam, M. Shahria
type: Text
identifier URI: http://hdl.handle.net/2429/89343