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Design of Concrete Structures Using High-Strength Steel Reinforcement (2011) / Chapter Skim
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Pages 59-63

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From page 59...
... Specific language is not provided in this report, as this may conflict with eventual AASHTO-adopted language. In all cases, language was proposed that specifically permits the use of high-strength reinforcing steel with specified yield strengths not greater than 100 ksi when the specific article permits it.
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From page 60...
... 5.7.3.2.5 Strain Compatibility Approach Limits the steel stress in a strain compatibility calculation to the specified yield strength. C5.7.3.3.1 Maximum Reinforcement Replaces 0.0 05 with "tension-controlled strain limit." 5.7.3.5 and C5.7.3.5 Moment Redistribution Adjusts strain limit to allow moment redistribution in structures using reinforcing steel with specified yield strengths up to 100.0 ksi.
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From page 61...
... 5.11.1.1 and C5.11.1.1 DEVELOPMENT AND SPLICES OF REINFORCEMENT, Basic Requirements 5.11.2 and C5.11.2 Development of Reinforcement Permits the development length equations to be used for reinforcing steel with specified yield strengths up to 100.0 ksi. 5.11.2.1 Deformed Bar and Wire in Tension Requires transverse confining steel for development of reinforcing steel with specified yield strengths greater than 75.0 ksi.
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From page 62...
... tests of "cold construction joint" interfaces reinforced with either A1035 or A615 bars demonstrated that current specifications requirements for such joints are adequate. Significantly, the restriction that fy be limited to 60 ksi when calculating shear friction capacity must be maintained regardless of the reinforcing steel used.
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From page 63...
... The current equation for maximum spacing requires that the tensile stress in steel reinforcement at the service limit state be calculated. For a beam, this is relatively simple.
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Key Terms

  • concrete beams
  • strength concrete
  • length equation
  • reinforcing steel
  • lrfd bridge

  • proposed changes
  • tensile stress
  • specified yield
  • strain compatibility
  • bar rupture

  • flexural crack
  • development length
  • shear friction
  • transverse reinforcement
  • steel reinforcement

  • steel strain
  • aashto lrfd
  • yield strengths
  • specific article
  • current specifications

  • shear capacity
  • specifications requirements
  • beam specimens
  • ified yield
  • recommended changes


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