Concrete Anchor Tension Pullout Force Design Equations and Calculator per ACI 318-02

This calculator will determine the variables for a Concrete Anchor subjected to Tension Pullout Force per ACI 318-02.

The American Concrete Institute (ACI) has adopted “Building Code Requirements for Structural Concrete ACI 318-02 and ACI 318R-02” as a construction standard in 2001. For the design of members, the Code also introduces new concepts of “compression-controlled” and “tension-controlled” sections. The code covers the design and construction of structural concrete used in buildings and other structural applications.

 Concrete Anchor Tension Pull Away Calculator 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 LOAD Nu = 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 ) ANALYSIS EFFECTIVE AREA OF FASTENER Ase = in2 BEARING AREA OF HEAD Ab = in2 CHECK FASTENER TENSILE STRENGTH : = k Nu where : f = CHECK CONCRETE BREAKOUT STRENGTH : = k Nu where : f = AN/Ano and y2 terms are 1.0 for single fasteners away form edges. y3 term is 1.0 for location where concrete cracking is likely to occur (i.e., bottom of the slab) CHECK PULLOUT STRENGTH : = k Nu where : f = y4 term is 1.0 for location where concrete cracking is likely to occur. EVALUATE SIDE-FACE BLOWOUT : Since this fastener is located far from a free edge of concrete (c>0.4hef ) this type of failure mode is not applicable. REQUIRED EDGE DISTANCES AND SPACINGS TO PRECLUDE SPLITTING FAILURE : Since this fastener is located far from a free edge of concrete (c>0.4hef ) this type of failure mode is not applicable. 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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