17

Assuming (1)y,buiit-up is less than 1.5, one can substitute the above expression for 1c in Equation 4.17. When fcPn equals 2218, we can solve for t. The result is t«| in. Back-substituting t = | into the above expression, we obtain (1)c,built-up = 0.975, which is indeed < 1.5. So, try 14 in. x 8 in. cover plates.

Check for local buckling: For the I-section:

Flange:

Web:

2 if hc

29,000 50

29,000 50

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