Answer Happy

You will perform an initial footing design for a retail and office complex. The building will be constructed as a 3-story reinforced concrete frame building with column footings beneath each column. The column/footing layout is shown in the plan illustration below. Each column is 2.5 ft x 2.5 ft square and extends the height of the building. The framing system is 2 spans in the short direction and 4 spans in the long direction, and thus the columns are spaced 36 ft in each direction. The story height is 14 ft per floor. The soil type is very compact course sand. 36 ft 14 ft 36 ft 14 ft 36 ft 14 ft 36 ft 36 ft 36 ft Elevation View 36 ft36ft Plan View A. Compute the total load for the building including dead load, live load, and snow load. Include the following sources in your calculations:
o Self-weight of concrete columns (150 pcf) • Exterior Cladding - proportional to outer perimeter wall area (25 psf) o Other loads - proportional to plan area • Additional Dead Load • Typical Story = 60 psf • Roof = 65 psf • Live Loads - Compute for office occupancy Live Load (psf) 60-100 100 100 40 40-60 Building Function Assembly Areas Corridors Restaurants Garages Hospital Libraries Manufacturing Office Residential Roof Warehouses 150 125-250 50 30-40 20 125-250 · Snow Load = 20 psf B. What will you assume for the bearing capacity of the soil? (Use Table 10.5).
B. What will you assume for the bearing capacity of the soil? (Use Table 10.5). C. Assume the total weight of the building is evenly distributed to 15 square footings (one beneath each column). Compute the following: o the total design load of the building o the total required footing area o the required area of each footing o the required width of each footing D. It is never too soon to develop critical thinking and engineering intuition as a check on engineering calculations. Does your answer for the required footing width seem reasonable? What width would you consider too small to be reasonable? What width would you consider too large to be reasonable?