4 3 Problem #1 (10 Points): Design an interior square column 18"x18" for the first story of an 8-story office building. The clear height of the first floor is 16 ft, and the height of all other floors is 11 ft. The building layout is in 24 bays, and the columns are not braced against sidesway. The loads acting on a first-floor interior column due to gravity and wind are as follows: Axial dead load - 300 K Axial live load-100 K Axial wind load-0K Dead-load moments 54K ft (Top) Live load moments 36K ft (Top) Wind-load moments 50K ft (Top) EM for beams 360 × 10' K in. 15 4 10 -3 x 20 60 Direction of analysis -8 x 20 160- Use f'c-5ksi, fy-60 ksi, and the ACI Code requirements. Assume an exterior column load of two-thirds the interior column load, a comer column load of one-third the interior column load. Ec 4.03 x 10 ksi. and Es 29000 ksi. Assume (Bottom of first floor column)-0 Use ED (0.2EJ+EJ) 1+ Pa and assume s-0 P = (kt) 1- 1 ΣΡ 0.752 Ρ. 21