Strain Rate Effect on Development Length of Steel Reinforcement
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Volume 141, Issue 11
Abstract
Accidental or premeditated explosions have detrimental effects on the infrastructure near the center of explosion and pose major threats to human life. Thus, research is currently underway to study the effects of explosions on infrastructure systems with the ultimate goal of minimizing infrastructure damage and saving lives. Because reinforced concrete is the most common building material used in blast-resistant infrastructure design and construction, understanding the effect of blast loads on reinforced concrete components is essential to reaching this goal. The prevailing design philosophy for blast-resistant structures is energy dissipation through reinforcement yielding (ductility) and large bending deformations without the incidence of nonductile failure modes such as shear and bond. However, information regarding the bond behavior and strength of steel reinforcement–concrete bonds under blast loads is rather scant; therefore, this paper reports on an experimental program designed to investigate the strain rate effect on steel reinforcement–concrete bond. Reinforced concrete beams longitudinally reinforced with 15M, 20M, or 25M were tested in a shock tube under simulated blast loading. The test results show that high strain rate increases the steel reinforcement–concrete bond strength and thus, that the static load development lengths of these bars are adequate for developing their dynamic yield strengths at high strain rate. The dynamic increase factor for bond stress is determined to be 1.11 for 15M, 2.24 for 20M, and 3.68 for 25M bar.
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Acknowledgments
This work was supported by the Chemical, Biological, Radiological/Nuclear, and Explosives and Technology Initiative CRTI Project 07-0176TD. The assistance and cooperation of the Department of Civil Engineering, University of Ottawa, where the testing was conducted, Professor Murat Saatcioglu, and the laboratory technicians and students is acknowledged. Many thanks are owed to the laboratory technicians at the Department of Civil and Environmental Engineering, Carleton University.
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Journal of Structural Engineering
Volume 141 • Issue 11 • November 2015
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© 2015 American Society of Civil Engineers.
History
Received: Jul 18, 2014
Accepted: Jan 26, 2015
Published online: Mar 11, 2015
Discussion open until: Aug 11, 2015
Published in print: Nov 1, 2015
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