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 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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