Use LFRD values 1) A simply supported beam spans 40 feet and supports a uniforml

Question

Use LFRD values

1) A simply supported beam spans 40 feet and supports a uniformly distributed factored load of w, 25 kips/ft· The beam is braced at 4 ft intervals. Select the lightest w 18 section for this beam based on the flexural and shear strengths. Use Table 3-6 for as much of your solution as possible. Include member weight at the end and check if your selection is still adequate. 2) A steel beam spans 40 feet and is subject to the following loads. Select the lightest beam for each of the following conditions based on bending, then check shear strength and then calculate the maximum deflection for the live load and total load for each beam. In all scenarios, the beam is fully braced. Tabulate results by listing member sizes, member weights (per foot), maximum live load deflection and maximum total deflections in columns. wu = 1.35 kips/ft; wo.-0.65 kips/ft. a) b) c) Beam is simply supported Beam is fixed at the ends Beam is cantilevered

Explanation / Answer

1)Uniform load on beam = 1.25kip/ft

Span of beam = 40ft

Total load on beam = 1.25*40=50 kips

The lightest W18 beam that can support the load for a span of 40ft is W18x40 per Table 3-6 as the maximum load the beam can support is 58.8 kips per LRFD

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