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Tensile capacity of threaded rods for steel design and concrete anchorage

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The Salmon and Johnson text "Design and Behavior of 
Steel Structures" indicates on page 121 that the LRFD 
Manual of Steel Construction reduces the Nominal Tensile 
Strength by 25% to account for the reduced area at the 
threaded portion of a bolt (LRFD commentary pg. 242).  
Therefore, they state "using the reduced stress on the 
gross area gives the same result as using the correct 
stress on the reduced area."

ACI 318-02 Appendix D section D.5.1.2 states that the 
nominal strength of an anchor or group of anchors shall 
not exceed: Ns=n*Ase*fut.  Therefore, they take 
the "tensile stress area" (reduced bolt area) multiplied 
by the unredued tensile strength, fut, of the anchor.

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