Question

A three-story building has a floor layout as shown in Figure 1 with 30 ft bays in each direction. It must support a uniform dead load of 90 psf and a uniform live load of 80 psf. For LRFD design, determine the required moment and shear strength for beams and required axial strength for columns indicated below. In the calculations, assume all beams and girders are simply supported. a) The beam marked with #1 if the deck spans from line 2-2 to 3-3 to 4-4. b) The beam marked with #2 if the deck spans from line B-B to C-C to D-D. c) The first story column marked with # 3. d) The first story column marked with #4. e) The first story column marked with #5. 30 ft 30 ft 30 ft - 11-19 30 ft- 30 ft 30 ft-- 30 ft- Figure 1. Floor plan of a four-story steel building

Answer 1

горе от I зове , 1 зове , 1 , зове, 1 1 о т 1 1 1 1 7yos 3) T 1 1 7 de 78 51 Ф ІГІ | 1 А 1 І - Tributary area

Ü) Required ancial strength Co the first storey colum ☺ Treibsilany area © - 15ft * 158€ Load = 236 psf ancial strength for column 3 - 236 x 15x15 - 53100 pounds (d) The first storey column Tributary area = 15 ft x oft Load = 236 psf ascial strength for column@ = 236 x 15 x 30 - 106200 pound C) The first storey column © Tributary area = 30 ft x 3oft Load = 236 psf ascial strength for column G - 236 x 30 x30 +212400 pounds.