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- A dam rectangular in cross – section with upstream face vertical. Water is 20.4 m deep on the upstream side. The dam is 23.2 m high and 14.8 m wide at the base and weighs 2310 kg/m3. Coefficient of friction between the base and the foundation is 0.85. Compute the factor of safety against sliding. a. 3.85 b. 2.67 c. 3.24 d. 1.455. The barge has the vertical sides and flat bottom of 30 m² area. When partly loaded the barge is immersed in sea water (s.g. = 1.03) to a depth of 0.61 m upon removal of the load the barge rises 0.4 m. a) What is the approximate weight of the barge? b) What vertical displacement will result if 9,070 kg truck is loaded on the barge?A planned flexible load area (see Figure P7.2) is to be 3 m × 4.6 m and carries a uniformly distributed load of 180 kN/m2. Estimate the elastic settlement below the center of the loaded area. Assume that Df = 2 m and H = . Use Eq. (7.4).
- A rectangular dam having a width of 15 m has a height of 24 m. The depth of the water on one side of the dam is 22 m. If the coefficient of friction between the dam and the foundation is 0.85. Compute the factor of safety for sliding if its density of concrete is 2310 kg/m^3. CHOICES: a.) 0.29 b.) 2.29 c.) 2.92 d.) 9.2212. A cubical float, 1.22 m on a side, weighs 1.78 kN and is anchored by means of a concrete block that weighs 6.67 kN in air. If 229 mm of the float is submerged when the chain connected to the concrete is taut, what rise in water level will lift the concrete off the bottom? Concrete weighs23.56 kN/m3.A 10-lb force is pushing the 40-lb block as shown. The incline angle of the plane is α=40º . The coefficient of static friction between the block and the incline is μs = 0.75 and the coefficient of kinetic friction is μk = 0.65. Will the block slide on the plane? If it does, will it slide up or down the plane? What is the friction force between the block and the plane?
- In the figure below, find the width b of the concrete dam from sliding. The specific gravity of concrete is 2.4 and the coefficient of friction between the base of the dam and the foundation is 0.4. Use 1.5 as the factor of safety against sliding. Is the dam also safe from overturning?A hollow cylinder 1.20 m in diameter 2.5 m high weighs 4 kN.a. Determine the weight of lead anchor fastened at the bottom of thecylinder to make it float vertically in water with 0.5m projecting abovethe water surface.b. If the lead anchor is instead placed inside the cylinder, determine itsweight to keep the cylinder float vertically with 0.5 m projecting abovethe water surface.The cross section of a quarter circular concrete block JKL as shown in Figure 5 is located at thebottom of a reservoir. The width (perpendicular to the paper) is 3 m. The specific weight of theconcrete block is 24 kN/m3. The coefficient of friction between the base of the block and thefoundation is 0.43. Determine if the concrete block is stable or not against sliding and overturningif the water is:A. At side XB. At side Y, with the same water level as A.
- A concrete cube ( y = 23.5 kN/m3 ) 0.60 m on an edge is submerged in 5 m of seawater (sg=1.03). Calculate the force to lift the cube if there is no seepage pressure at the bottom of the cube A. 23.3 kN B. 28.5 C. 27.7 D. 26.9The section of a gravity is as shown in the figure. Assume hydrostatic uplift to vary uniformly from full hydrostatic uplift from heel to zero at the toe. Determine the total reaction per unit length at the base of the dam (lbs/foot). Use sp. gr. of concrete = 2.4. x = 19.1 ft.Two equal blocks A and B are connected to each other by a rod and stand against the vertical and horizontal planes as shown in the figure. Since the slip starts for θ = 60, calculate the friction coefficient assumed to be the same