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Axial Capacities of Eccentrically Loaded Equal Leg Single Angles

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ALPHA756

ALPHA756

Structural
Apr 24, 2023
4
CA
Hi there,

Currently I am trying to determine the strength of a single angle subjected to axial compressive load. Due to connection eccentricities moment will be generated.

Now as per F10, AISC 360 if there is no continuous lateral resistant along the length of the member, then we are allowed to determine the capacity of the section based on bending across its principal axis.

Now solution to determine the strength along principal axis is quite straight forward. However, I am facing a challenge to determine the demand on the section. The problem I am facing over here is to determine the eccentricity with respect to the principal axis of the single angle (ew and ez). Can somebody advise me on how should I determine the eccentricity with respect to the principal axis of a single angle?

For your reference I have attach an image from the technical document "Axial Capacities of Eccentrically Loaded Equal-Leg Single Angles: Comparisons of Various Design Methods"
Single_Angle_kue20u.png
 
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I use the 14th Edition of the AISC Manual. There is a table (Table 4-12) which covers this exact situation. No calculations required.

DaveAtkins
 
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Also, if you meet the requirements listed in Section E5 (Single-Angle Compression Members), you can use Table 4-11 (Concentrically Loaded Single Angles in Axial Compression) with the adjusted slenderness ratio determined in that section.

This method accounts for the restraint provided by the support (which makes it so the angle tends to buckle perpendicular to the support plate rather than about its minor principal axis) as well as the eccentricity. It does this by providing a calculation for an adjusted slenderness ratio which you can then use in the concentrically loaded table.

Structural Engineering Software: Structural Engineering Videos:
 
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