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Concrete Anchor Tension Pull Away Calculator ACI
318-02
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INPUT
DATA & DESIGN SUMMARY
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CONCRETE
STRENGTH
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fc'
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=
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ksi
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SPECIFIED
STRENGTH OF FASTENER
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fut
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=
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ksi
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(The strength of most fastenings is likely
to be controlled by the embedment strength rather
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than the steel strength, so it is
usually economical to use ASTM A307 Grade A fastener.)
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FACTORED
DESIGN LOAD
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Nu
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=
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k
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EFFECTIVE
EMBEDMENT DEPTH
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hef
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=
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in
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FASTENER
DIAMETER
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d
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=
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in
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FASTENER
HEAD TYPE
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( 1=Square, 2=Heavy Square, 3=Hex, 4=Heavy
Hex, 5=Hardened Washers )
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ANALYSIS
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EFFECTIVE
AREA OF FASTENER
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Ase
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=
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in2
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BEARING
AREA OF HEAD
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Ab
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=
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in2
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CHECK
FASTENER TENSILE STRENGTH :
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=
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k
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Nu
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where :
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f
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=
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CHECK
CONCRETE BREAKOUT STRENGTH :
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=
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k
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Nu
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where :
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f
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=
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AN/Ano and y2 terms are 1.0 for single fasteners away form edges.
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y3 term is 1.0 for location where concrete cracking is likely to
occur (i.e., bottom of the slab)
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CHECK
PULLOUT STRENGTH :
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=
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k
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Nu
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where :
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f
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=
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y4 term is 1.0 for location where concrete cracking is likely to
occur.
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EVALUATE
SIDE-FACE BLOWOUT :
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Since this fastener is located far from a free edge of concrete
(c>0.4hef )
this type of failure mode is not applicable.
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REQUIRED
EDGE DISTANCES AND SPACINGS TO PRECLUDE SPLITTING FAILURE :
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Since this fastener is located far from a free edge of concrete
(c>0.4hef )
this type of failure mode is not applicable.
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Summary of Dimensional
Properties of Fasteners
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Effective
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Fastener
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Gross
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Area of
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Bearing Area of Heads, Nuts, and
Washers
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Diameter
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Area of
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Threaded
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( Ab ) ( in2 )
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( in )
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Fastener
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Fastener
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Square
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Heavy
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Hex
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Heavy
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Hardened
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( in2 )
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( in2 )
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Square
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Hex
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Washers
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Note:
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For seismic Design Category C, D, E
or F, the design strength of anchors shall be taken as 0.75 fNn & 0.75fVn.
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(ACI318-02 D3.3.3, IBC 1913.3.3)
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