Question

Using both LRFD and ASD, Select the most economical (lightest) section based on moment only, for the depth indicated. Assume full lateral bracing (Lb 0') and ignore beam selfweight. 1. a. W24 depth: (hint: calculate load demand and find lightest W24x?? section above the demand). P- P -25 30 b. W27 depth for LRFD, W30 depth for ASD: (hint: calculate load demand and find lightest W27x?? or W30x?? section above the demand. Note that since the point load is not at midspan, Mmax will not be concurrent between uniform and point load equations. Mx should be used to superimpose concurrent moments. Can conservatively superimpose Mmax, but extra point will be awarded for computing Mx or moment diagram for concurrent moment demand).

Answer 1

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