Calculating Anchor Bolt Pullout Strength - zaab.org

1 ITW PHI L ADELPH I A R ESI NS130 Commerce Drive Montgomeryville, PA 18936 215-855-8450 Fax 215-855-4688 Bond betweenthe epoxy andthe concretebreaksLDTechnical Bulletin #691 BBulletinDescriptionAnchor bolt Pull Out Strength is the force required to pull a single bolt out of its foundation. Theseparation can occur between the epoxy grout and the concrete foundation or it can occur between theanchor bolt and the epoxy grout itself. This bulletin provides the formulas needed to calculate the forcerequired to pull an Anchor bolt out in either calculate the Total Pull Out Strength of the entire machine, multiply the force required topull one boltout times the total number of Calculating Pull Out Strength it is assumed clean, threaded rod or bolt with a coarse surface profile is nut and washer are installed at the bottom of the rod to act as a mechanical Anchor bolt hole is clean and dry, with no StrengthEpoxy to ConcreteThe bond of the epoxy grout to the concretefoundation is stronger than the bond of the concrete toitself.

2 Typically, concrete will separate next tothe bondline of the epoxy and concrete. Therefore, the weakestlink in the bond of epoxy to concrete is the force required to pull concrete apart iscalled itsShear Strength . A conservative value forconcrete shear Strength is 800psi. To determine theforce required to Pullout the bolt separating it at theepoxy to concrete bond, use the following calculation:Force = D x x L x 800 psiWhere:F = bolt Pullout Force in = Grout Hole Diameter in inchesL = Length in inches of the grout hole = are examples of the force required to pull outvarious size bolts out of various size OUT Strength IN POUNDSBOLT LENGTHHOLEDIAMETER3 4 5 10 5/8"4,7106,2807,85015,7003/4"5,6507,5309 ,42018,8401"7,53010,05012,56025, "11,30915,07018,84037, 15,07020,10025,13050,260 Calculating Anchor BoltPullout StrengthCalculating Pull-Out StrengthBulletin No.

3 691B, Page2 General:Every reasonable effort is made to insure the technical information andrecommendations on these data pages are true and accurate to the best of our knowledge atthe date of issuance. However, this information is subject to change without notice. Priorversions of this publication are invalid with the release of this version. Products andinformation are intended for use by qualified applicators that have the required background,technical knowledge, and equipment to perform said tasks in a satisfactory manner. Consultyour local distributor for product availability, additional product information, and :ITW Philadelphia Resins, a division of Illinois Tool Works Inc., warrants that itsproducts meet their printed specifications.

4 This is the sole warranty. This warranty expires oneyear after product Claims:If any product fails to meet the above, ITW Philadelphia Resins will, at itsoption, either replace the product or refund the purchase price. ITW Philadelphia Resins willhaveno other liability for breach of warranty, negligence, or otherwise. All warranty claimsmust be made in writing within one year of the date of shipment. No other claims will :ITW Philadelphia Resins makes no other warranty,expressed or implied, andspecifically disclaims any warranty of merchantability or fitness for a particular concerning the use of products are not warranties. The purchaser assumes theresponsibility for determining suitability of products and appropriate use. ITW PhiladelphiaResins sole liability, for breach of warranty, negligence or otherwise, shall be thereplacement of product or refund of the purchase price, at ITW Philadelphia Resins election.

5 Under no circumstances shallITW Philadelphia Resins be liable for any indirect,incidental or consequential of Warranty:No distributor or sales representative has the authority tochange the above provisions. No change in the above provisions will be valid unless inwriting and signed by an officer or the Technical Director of ITW Philadelphia Resins. Noterm of any purchase order shall serve to modify any provision of this and Arbitration:If any dispute arises relating to products or productwarranties, either the purchaser or ITW Philadelphia Resins may a) initiate mediationunder the then current Center for Public Resources (CPR) Model Procedure for Mediation ofBusiness Disputes, or b) initiate a non-binding arbitration under the rules of the AmericanArbitration Association for the resolution of commercial 45 Concrete will break atabout a 45oangleHBond betweenthe epoxy andthe Anchor boltbreaksDLBond StrengthEpoxy to SteelThe bond of grout to the steel Anchor bolt can be calculatedusing 1600 psi as the Bond Strength of epoxy to steel.

6 Thistoo is also a conservative number. To determine the forceat the grout-to - bolt interface, use the following calculation:F = BD x x L x 1600 psiWhere:F = bolt Pullout Force in = bolt Diameter in inchesL = Length in inches of the boltembedded in grout(does not include the portion of the bolt that iswrapped with tape or inside a bolt sleeve. = of the force required to separate a bolt from thesurrounding epoxy assuming there is no OUT Strength IN POUNDSGROUTED bolt LENGTHBOLTDIAMETER3 4 5 10 3/8"5,6507,5309,42018,8401/2"7,54010,040 12,56025,1203/4"11,30015,07018,84037,680 1"15,07020,10025,13050, "22,61030,15037,69075,380 Pull-OutStrength Anchor bolt in ConcreteAs a comparison, an Anchor bolt set in a concrete foundation will typically crack upand out from the bottom of the bolt at a 45oangle in a cone shaped section.)

7 Theforce required to pull up this cone shaped section of concrete is the force requiredto separate concrete over the total surface area of the cone. TheSurfaceArea of a Cone (SACone) = Lateral Surface Area of a Right CircularCone with 45oSides:SACone = x x H2 The force required to pull the concrete apartis the Shear Strengthof concrete (800 psi)times the Surface Area of the lbs = 800 psi x SACone in2 Force lbs = 800 x x x H2 Date08/2005