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Load And Resistance Factor Design For Building Column

Plastic analysis of prismatic compression members in buildings is permitted if (Fy)½(l/r) does not exceed 800 and Fuless than equal to 65 ksi (448 MPa). For axially loaded members with b/t less than equal to (lambda)r , the maximum load P u , ksi (MPa= 6.894 X ksi), may be computed from

Pu = 0.85AgFcr

Where Ag=gross cross-sectional area of the member
F cr =0.658 lambda Fy for lambda <= 2.25

=0.877 Fy/lambda for lambda  > 2.25

lambda =(Kl/r)2(Fy/286,220)

The AISC specification for LRFD presents formulas for designing members with slender elements.

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Kanwarjot Singh

Kanwarjot Singh is the founder of Civil Engineering Portal, a leading civil engineering website which has been awarded as the best online publication by CIDC. He did his BE civil from Thapar University, Patiala and has been working on this website with his team of Civil Engineers.

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