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Homework _ 1 Solutions

# Homework _ 1 Solutions - Problem 2.1 A proposed column has...

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Problem 2.1 – A proposed column has the following design loads: Axial Load: P D = 200 k, P L = 170 k, P E = 50 k, P W = 60 k (all compression) Shear Load: V D = 0 k, V L = 0 k, V E = 40 k, P W = 48 k Compute the design axial and shear loads for foundation design using ASD. Solution (2.1) P = P D = 200 k V = V D = 0 k (2.2) P = P D + P L = 200 k + 180 k = 370 k Governs V = V D + V L = 0 k (2.3a) P = 0.75(P D + P L + P W ) = 0.75(200 k + 170 k + 60 k) = 322 k V = 0.75(V D + V L + V W ) = 0.75(0 k + 0 k + 48 k) = 36 k Governs (2.4a) P = 0.75(P D + P W ) = 0.75(200 k + 60 k) = 195 k V = 0.75(V D + V W ) = 0.75(0 k + 48 k) = 36 k Problem 2.9 – A certain clayey soil contains 0.30 percent sulfates. Would you anticipate a problem with concrete foundations in this soil? Are any preventative measures necessary? Explain. Solution Per Table 2.3, on page 40, severe problems with sulfates - Use Type V cement - W:C Ratio 0.45 Problem 2.14 – A two-story department store identical to the one in Figure 2.12 is to be built. This structure will have reinforced masonry exterior walls. The ground floor will be slab-on- grade. The reinforced concrete upper floor and roof will be supported on a steel-frame with columns 50ft on-center. Compute the allowable total and differential settlements for this structure. Solution δ a = 1 inch (per Table 2.1 on page 29) ϴ a = 1/500 (per Table 2.2 on page 33) δ Da = ( )( ) ft in ft 1 12 50 500 1 = 1.2 inches

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Problem 3.2 - A certain saturated sand (S = 100%) has a moisture content of 25.1% and a specific gravity of solids of 2.68. It also has a maximum index void ratio of 0.84 and a minimum index void ratio of 0.33. Compute its relative density and classify its consistency. Solution
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Homework _ 1 Solutions - Problem 2.1 A proposed column has...

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