A column member with Lcx=Lcy=15 ft must resist an ultimate LRFD strength of Pu=500 kip. 1. Select the lightest W14. 2. Select the lightest W12. 3. Select the lightest W10. 4. Select the lightest W8.
A column member with Lcx=Lcy=15 ft must resist an ultimate LRFD strength of Pu=500 kip.
1. Select the lightest W14.
2. Select the lightest W12.
3. Select the lightest W10.
4. Select the lightest W8.
A column member with Lcx=Lcy=15 ft must resist an ASD required strength of Pa=325 kip.
5. Select the lightest W14.
6. Select the lightest W12.
7. Select the lightest W10.
8. Select the lightest W8.
A column member must resist an LRFD required strength of Pu=600 kip over effective lengths Lcx=30 ft and Lcy=15 ft. The member is A572 Gr. 42 steel.
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Determine a required gross area, Ag, for the member. Assume a controlling slenderness ratio of Lc/r=60.
Note: You cannot read φFcr from Table 4-14, so use equation (22.1) or (22.2), whichever one is appropriate, from Lecture 22 to determine the critical stress, Fcr, then multiply by φ=0.9 to get φFcr.
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Select the lightest W12 that will satisfy the gross area requirement.
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Determine if the W12 you selected has sufficient LRFD available strength, φPn, to resist the required strength.
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