Building Structures - Test 2 with Solutions | ARCH 4075, Exams of Structures and Materials

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Test No. 2 = April 22, 2013 1, Write and sign “I have neither given nor received unauthorized assistance on this test”. a 2. Da not separate the exam sheets and use them to answer the questions. 3. You can only use your own notes and books during the test. Figures below shows the floor framing plan and section of a two-story steel building structure. The floor consists of metal deck with an average of 4 inch concrete. Assume 5 psf for the weight of electrical and mechanical systems, 5 psf for the steel beams and girders weight. Weight of partitions is 20 psf. The floor live load is 50 psf. The total stair dead load is 20 psf and the stair live load is 100 psf, Unit weight of conerete is 150 pef, and the modulus of elasticity of steel is 29,000 ksi. Use A992 steel. Answer the following problems: Problem One (60 pts.) Select the lightest W-shape for beam (B-2). The allowable total load deflection at the beam mid-span is span/240. Consider moment, shear, and deflection. Indicate the laterally un-braced length of the beam. Problem Two (40 pts. Check the adequacy of W21x44 used for girder (G-1). Consider moment, and shear ONLY. Indicate the laterally un-braced Iength of the girder. q 7) 49 itt 7 a ao ie Lo alc alo “4 iJ Li [00 FG.) 4 hUG@e) So = ope et