# Corbel

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DESIGN OF CORBELSCheck a/d < 1 (else, it is probably a shallow or deep beam) Step 1. Find factored shear  !  and tensi e force N !c  If N  uc  is not specified, use a minimum value of N  uc  = 0.2 V  u   (ACI 11.9.3.4)Compute nominal values of shear and tensile force   V n  = V u  / .! # \$ nc  = \$ uc  / .! If V n  % .& fc'  d * V n  % !  d (l. units)then section si+e is inade,uate (ACI 11.9.3.&) Step #. Co\$p!te shear%friction reinforce\$ent &'CI 11.(.).1*  ynvf    f  V      µ  = -here µ  = 1.4 for concrete placed monolithicall µ  = 1. for concrete placed a0ainst hardened concrete (see ACI 11..4.3) Step +. Ca c! ate re,!ired f e-!ra reinforce\$ent &11..+.+* )()(  !d  f  d h N aV     yncn f   −+= ( assume !d = 0. #) Step ). Reinforce\$ent to carr tensi e force &'CI 11..+.)*  yncn  f   N    = ++ ′ bd       y f  c f  n f  nvf   4. of lar0er 3& Step 0. Re,!ired \$ain f e-!ra stee &' s * is i2en 3 &'CI11..+.0 and 11..0*Step 4. 5ro2ide c osed hori6onta stirr!ps &'CI 11..)*7    h  = 0.# (  s  \$  n  ) 2nsure ade,uate detailin0 (ACI 11.9.  11.9.)
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