Final Exam Spring 2018-Structural and Site Plans Below is a diagram of a rectang

Question

Final Exam Spring 2018-Structural and Site Plans Below is a diagram of a rectangular concrete slab supported by four girders and one interior beam, all structural steel members, and four columns. c. girder beam 8 ft girder column 25 ft (0) (2 points) Compute the uniform factored load (in plf) on the interior beam, given that the concrete slab has an average thickness of 3" and exerts 12 psf, per inch of thickness, and that the slab is plastered with %" plaster weighing 5 psf. The live load for the floor is 40 psf. Neglect the weight of the beam itself. d. 2 points) Is the slab above a one-way slab or a two-way slab? Justify your answer e. Answer the following concisely: ) 2 points) What type of loading are earthquake loads considered? Which building parts are typically designed to withstand earthquake loads? ( 1 point) Briefly explain how live loads are determined for a building.

Explanation / Answer

c i)tributary width of beam = (8/2)+(8/2)=8 ft

Dead load from slab = 12*3=36 psf

dead load of plaster=5 psf

live load =40 psf

factored uniforkm load =1.2*(36+5)+1.6*40=113.2 psf

uniform load on beam = 113.2*8=905.6 plf = 0.9056 kip/ft

d)Slab is one way .This can be concluded from the fact that the aspect ratio of the slab, i.e., 25/8=3.125 >2

e i)Eartquake loads are considered lateral loads on the building

The lateral load resisting system of the building is designed to withstand earthquake loads

ii) live loads are determiend from the type of occupancy the building has. For different occupancies, different livel load is tabulated in ASCE 7-10

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