FRC-Encased Steel Joist Composite Beams under Reversed Cyclic Loading
Publication: Journal of Structural Engineering
Volume 124, Issue 10
Abstract
Experimental and analytical studies were conducted to investigate the behavior of fiber reinforced concrete–encased steel joist composite members subjected to reversed cyclic bending. This new and innovative structural system completely eliminates the need for any shear connectors between the steel joists and surrounding concrete as well as the need for conventional longitudinal and transverse reinforcement, all of which are quite labor intensive. All connections in the system are steel-to-steel; therefore, the system can be used with cast-in-place or precast construction. Five one-half-scale specimens were tested, each consisting of open web steel sections encased in concrete containing discrete steel fibers. In the test program, the most important parameter studied was the configuration of steel elements. The test results are very encouraging. The two materials (structural steel and fiber-reinforced concrete) interact to provide stable hysteretic behavior with excellent energy dissipation and ductility. The study indicates that the presence of steel joists as well as steel fibers can adequately inhibit the chances of brittle shear failure, thus making the system very suitable for seismic resistant structures. The specimen load-carrying capacity and its hysteretic response can be quite accurately predicted by the proposed analytical models.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 124 • Issue 10 • October 1998
Pages: 1115 - 1124
Copyright
Copyright © 1998 American Society of Civil Engineers.
History
Published online: Oct 1, 1998
Published in print: Oct 1998
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