BRAE433 Lecture Ch 5 ss

BRAE433 Lecture Ch 5 ss - RC Design Ch 5 Development,...

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1 RC Design Ch 5 – Development, Splices ITRC Cal Poly and Simple Span Bar Cutoffs Development Length Fundamental assumption in RC design RC design: a perfect bond and no slippage BRAE/ITRC Cal Poly between concrete and steel
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2 Development Length Concrete will crack and break the bond between steel and concrete It is possible to get failure all along beam except at the "end anchorage" BRAE/ITRC Cal Poly beam except at the end anchorage and still be adequate since steel is in tension and maintaining integrity l d , Development Length BRAE/ITRC Cal Poly End Anchorage Splices
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3 Lid Project - End Anchorage BRAE/ITRC Cal Poly Problem: if l d too long, use hook to anchor BRAE/ITRC Cal Poly
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4 Development Length flexural bond - stress between concrete and steel want a development length (l d ) to insure that beam not have a failure in BRAE/ITRC Cal Poly insure that beam not have a failure in flexural bond aci code rules (min 12 in) Variables Ψ t = (Sigh sub t) location variable (old α ) Ψ e = coating factor (old β ) Ψ s = size factor (old γ ) BRAE/ITRC Cal Poly
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5 Development Length Formula s e t fy ψ 3 K + b b tr d d d K c fc l + = λ ' 40 3 fy BRAE/ITRC Cal Poly Table 5-1 2.5 TR b c d = ' 40 fc K D Development Length d b = nominal diameter of bar Ψ t = location factor = 1.3 for 12 in or more of concrete below
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This note was uploaded on 01/13/2011 for the course BRAE 433 taught by Professor Styles during the Fall '10 term at Cal Poly.

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BRAE433 Lecture Ch 5 ss - RC Design Ch 5 Development,...

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