![]() Requirement 1: This requirement states that the minimum net area beyond the pin hole, parallel to the axis of the member (A1), shall not be less than 2/3 of the net area across the pin hole (A2). If these requirements are not met, a smaller value for "a" should be used for the calculation of tensile capacity. Rule 4: The thickness is greater than or equal to 0.25 times the hole diameter Rule 4:ĪISC Code Checks per Section D3.2: The D3.2 section of AISC code has three separate geometry checks that can be applied to the lifting lug. Rule 3: The thickness of lug is greater than or equal to 0.5 inches These are refered to as Rule 3 and Rule 4 here. 1, this failure is prevented by ensuring a minimum thickness of lug of 0.5 inches and 0.25 times the hloe diameter d. Pw4=1.2.t/1.8dįailure Mode 5: This failure mode involves the out-of-plane buckling failure of the lug. The shear area is twice the cross-sectional area beyond the hole for the pin.įailure Mode 4: This failure mode involves tensile failure as the pin tries to push out of a block of steel through the edge of the lug plate. Using a bearing stress of 0.9Fy, and a "factor" of 1.8 diameter of pinįailure Mode 3: This Failure mode involves shear failure as the pin tries to push out a block of steel through the edge of the lug plate. Let us assume a pin diameter 1/2" less than the hole diameter. Often the pin diameter is much less than the hole diameter. Ultimate tensile load Factor of safety Pw1=Pu/FSįailure Mode 2: This Failure mode involves bearing failure at the pin/lifting lug interface. Rule 2: The dimension "e" must be greater than or equal to 0.67 times the hole diameter, d Rule 2:Įvaluation based on Failure Mode: Failure Mode 1: This failure mode involves tension failure on both sides of the hole. Rule 1: The dimension "a" must be greater than or equal to half the hole diameter, d. ![]() ![]() DESIGN OF LIFTING LUG INPUT Thickness Diameter of hole Dimension a Dimension e Ultimate steel strengthĪ Geometric Guidelines: There are some geometric guidelines to be considered as recommended in Ref 1. ![]()
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