Concrete Anchor Group Tension and Shear
Fasteners Near Two Edges Based on ACI 318-02 Calculator
Case #5

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Concrete Anchor Group Tension and Shear Fasteners Near Two Edges Based on ACI 318-02 Calculator Case # 5

Concrete Column Base 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 COLUMN AXIAL LOAD Pu = k
FACTORED TOTAL BASE SHEAR LOAD Vu = k
FACTORED COLUMN MOMENT Mu = ft-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 FASTENER & EDGE c1 = in
DIST. BETWEEN FASTENER & EDGE c2 = in
ANALYSIS
NUMBER OF GOVERNING FASTENERS n =
MAX TENSION ON GOV'G FASTENERS
Nu = Mu/s - Pu/2 = k
SHEAR FORCE ON GOV'G FASTENERS
Vu = Vu, total / 2 = k
EFFECTIVE AREA OF ONE FASTENER
Ase = in2
BEARING AREA OF ONE HEAD Ab = in2, ( or determined from manufactures's catalogs.)
CHECK THE GOVERNING FASTENERS TENSILE STRENGTH :
= k Nu
where : f =
CHECK CONCRETE BREAKOUT STRENGTH OF GOVERNING FASTENERS :
= 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.
= 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 OF GOVERNING FASTENERS :
= K
CHECKGOVERNING FASTENERS SHEAR STRENGTH :
= k Vu
where : f =
= 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.
= 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 OF GOVERNING FASTENERS :
= 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 OF GOVERNING FASTENERS :
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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