Design of Concrete Structures Using High-Strength Steel Reinforcement (2011) / Chapter Skim
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Finally, coupling high-strength steel reinforcement with high-performance concrete should result in a much more efficient use of both materials. This report provides an evaluation of existing AASHTO LRFD Bridge Design Specifications relevant to the use of high-strength reinforcing steel and other grades of reinforcing steel having no discernable yield plateau.
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From page 2... ...
Flexure The current specifications design methodology for flexure, that is, a simple plane sections analysis using stress block factors to model concrete behavior and an elastic-perfectly plastic steel behavior (having Es = 29,000 ksi) , is shown to be appropriate for values of fy ≤ 100 ksi.
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From page 3... ...
All developed bar stresses exceeding fy and approaching the ultimate bar capacity, fu, prior to the splice slipping, and in one case bar fracture. Tests of hooked bar anchorage resulted in bar rupture outside of the anchorage region with very little slip, clearly indicating the efficacy of the hooked bar development requirements in the specifications.
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From page 4... ...
Summary The extension of present AASHTO LRFD Bridge Design Specifications to permit reinforcing bar yield strengths not exceeding 100 ksi was investigated and, for the most part, validated for concrete strengths up to 10 ksi, and, in some instances, 15 ksi. This study did not address seismic applications, and no such increase in permitted yield strength is addressed for Seismic Zones 2 through 4.
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