Behavior and Design of Post-Installed Connectors in Thin Ultra-High Performance Fiber Reinforced Concrete Members
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Authors
Prejs, Andy
Date
Type
thesis
Language
eng
Keyword
UHPFRC , Screw anchors , Post-installed connectors , Pull-out , Shear , Sandwich wall panels , Thin concrete members
Alternative Title
Abstract
Ultra-high-performance fiber reinforced concrete (UHPFRC) has been investigated as a wythe material in insulated double wythe precast concrete (DWPC) panels resulting in thin lightweight wythes while still satisfying structural, thermal, and architectural requirements. However, the connection between the panels and a building frame have not been studied yet. This thesis includes 230 experimental tests investigating the pull-out and shear performance, in accordance with ASTM E488-18, of screw anchors and novel threaded rod connector embedded in thin UHPFRC members, containing polyvinyl alcohol (PVA) fibers.
The pull-out study examines the effects of slab thickness (tc), connector diameter (d), fiber percentage in UHPFRC (pf), embedment depth (hef), support ring diameter (ds) of the slab and concrete compressive strength (f’c). The threaded rod outperformed the screw anchor with ultimate pull-out loads (Pu) that were 20-50% larger. Increasing hef from 0.75tc to 1.0tc increased Pu by 19-67% for the screw anchor. Increasing tc from 15 to 38 mm, with 1.0tc embedment, resulted in Pu to be on average over 3.5 and over 4 times greater for the screw anchor and threaded rod, respectively. Results showed that d, pf, and ds did not have significant effect on Pu. ACI 318-19 and Tarawneh et. al. (2020) design equations grossly overestimated Pu of the connectors. New design equations are proposed based on regression analysis. A design example was presented to determine if the connectors can satisfy pull-out design requirements.
The shear study examines the effects of slab thickness (tc), connector diameter (d), fiber percentage (pf) in UHPFRC, edge distance (c1), and support span length (ls). The threaded rod outperformed the screw anchor with ultimate shear loads (Vu) that were 29-93% larger. Increasing c1 had significant effect on Vu, where it was over two times greater when c1 was increased from 38 to 89 mm. Increasing tc from 25 to 38 mm resulted in Vu increasing by 24-43% for the screw anchor, while for the threaded rod, Vu increased by 1.3-3.3 times when tc increased from 15 to 38 mm. Results showed that d, pf, and ls did not have significant effect on Vu. ACI 318-19 and Tarawneh et. al. (2020) design equations grossly overestimated Vu of the connectors. New design equations are proposed based on regression analysis. A design example was presented to account for combined pull-out and shear forces in design.
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Queen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canada
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Intellectual Property Guidelines at Queen's University
Copying and Preserving Your Thesis
This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.
CC0 1.0 Universal
ProQuest PhD and Master's Theses International Dissemination Agreement
Intellectual Property Guidelines at Queen's University
Copying and Preserving Your Thesis
This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.
CC0 1.0 Universal