How does ideCAD calculate steel members' tensile strength according to AISC 360-16?
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In bolted and welded joints of tension members, the cross-sectional area operating in load transfer is not equal to the entire cross-section area due to the uneven distribution of the load.
Since the L and U sections are used, especially in the corners that are not connected with bolts or welds, a certain region is called an effective area in load distribution. The consequence of this partial connection is that the connected element becomes overloaded, and the unconnected part is not fully stressed. Due to this phenomenon called the 'Shear Lag' effect, an effective net area is used in the design.
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3 Three different areas are used in the strength calculation of tension members:
Gross Area (Ag)
Net Area (An)
Effective Net Area (Ae)
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Design with AISC 360-16
There are 3 Three different collapse conditions in the elements are affected by the tensile force: Yielding Limit State, Rupture Limit State, and Block Shear Limit State.
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The characteristic block shear strength is calculated by Equation 13.19, based on the yielding and rupture limit states along the Rn shear surface or surfaces and the rupture limit states along the vertical tensile surface. Ant is the net area subject to tension. Where the tension stress is uniform Ubs=1; where the tension stress is nonuniform Ubs=0.5.
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