Concrete Anchor Group Tension and Shear
Fasteners Near Two Edges Based on ACI 318-02 Calculator

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Concrete Anchor Group Tension and Shear Fasteners Near Two Edges Based on ACI 318-02 Calculator

Concrete Anchor Group Tension and Shear Fasteners Near Two Edges Based on ACI 318-02
INPUT DATA & DESIGN SUMMARY
CONCRETE STRENGTH fc' = ksi
SPECIFIED STRENGTH OF FASTENER fut = ksi
(The strength of most fastenings is likely to be controlled by the embedment strength rather
than the steel strength, so it is usually economical to use ASTM A307 Grade A fastener.)
FACTORED DESIGN TENSION LOAD Nu = k
FACTORED DESIGN SHEAR LOAD Vu = k
EFFECTIVE EMBEDMENT DEPTH hef = in
FASTENER DIAMETER d = in
FASTENER HEAD TYPE
( 1=Square, 2=Heavy Square, 3=Hex, 4=Heavy Hex, 5=Hardened Washers )
FASTENER CENTER-TO-CENTER SPACING s = in
DIST. BETWEEN THE FASTENER AND EDGE c1 = in
DIST. BETWEEN THE FASTENER AND EDGE c2 = in
ANALYSIS
NUMBER OF FASTENERS n =
EFFECTIVE AREA OF FASTENER Ase = in2
BEARING AREA OF HEAD Ab = in2, ( or determined from manufactures's catalogs.)
= k Nu
where : f =
= k Nu
where : f =
y1 term is 1.0 for no eccentricity in the connection.
y3 term is 1.0 for location where concrete cracking is likely to occur.
CHECK PULLOUT STRENGTH :
= k Nu
where : f =
y4 term is 1.0 for location where concrete cracking is likely to occur.
CHECK SIDE-FACE BLOWOUT STRENGTH :
cmin > 0.4hef
Since the fasteners are located far from a free edge of concrete, c>0.4hef ,this type of failure mode is not applicable.
DETERMINE DESIGN TENSILE STRENGTH :
= K
CHECK FASTENERs SHEAR STRENGTH :
= k Vu
where : f =
CHECK CONCRETE BREAKOUT STRENGTH FOR SHEAR LOAD :
= k Vu
where : f =
y5 term is 1.0 for no eccentricity in the connection.
y7 term is 1.0 for location where concrete cracking is likely to occur.
l term is load bearing length of the anchor for shear, not to exceed 8d.
CHECK PRYOUT STRENGTH FOR SHEAR LOAD :
= k Nu
where : f = 0.75
y3 term is 1.0 for location where concrete cracking is likely to occur.
kcp = for hef > 2.5 in.
DETERMINE DESIGN TENSILE STRENGTH :
= K
REQUIRED EDGE DISTANCES AND SPACINGS TO PRECLUDE SPLITTING FAILURE :
Since headed cast-in-place fasteners are not like to be highly torqued, the minimun cover requirements of ACI 318 Sec. 7.7 apply.
CoverProvd > CoverReqd
[Satisfactory]
CHECK TENSION AND SHEAR INTERACTION :
Since Nu 0.2 f Nn and
Vu 0.2 f Vn
  Summary of Dimensional Properties of Fasteners        
Effective
Fastener Gross Area of Bearing Area of Heads, Nuts, and Washers
Diameter Area of Threaded ( Ab )?? ( in2 )
( in ) Fastener Fastener Square Heavy Hex Heavy Hardened
( in2 ) ( in2 ) Square Hex Washers
Techincal Reference:
1. Ronald Cook, "Strength Design
??of Anchorage to Concrete," PCA,
??1999.
Note:
  For seismic Design Category C, D, E or F, the design strength of anchors shall be taken as 0.75 fNn & 0.75fVn.
(ACI318-02 D3.3.3, IBC 1913.3.3)
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