The width of a square footing and the diameter of a circular footing are equal. If both the footings are placed on the surface of sandy soil, the ratio of the ultimate bearing capacity of circular footing to that of square footing will be
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- A 5 * 7 ft footing is founded at a depth of 2 ft and supports a vertical load of 80 k and a moment load of 30 ft-k in the B direction and 50 ft-k in the L direction. Determine the dimen-sions of the equivalent uniformly loaded footing and compute the equivalent bearing pressure.A strip footing is resting on the ground surface of a pure clay bed having an undrained cohesion c. The ultimate bearing capacity of the footing is equal toTwo footings, one circular and the other square, are founded on the surface of a purely cohesionless soil. The diameter of the circular footing is same as that of the side of the square footing. The ratio of their ultimate bearing capacities is
- A square footing is required to support a column of dimensions 450 X 450 mm. carrying 1000KN dead load and 750 KN live load. Given allowable bearing capacity of the soil is 210 KN/m^2, concrete compressive strength is 22.5 MPa .and steel yield is 400 MPa. Assume footing thickness is 600 mm Find footing side lengthA footing supporting a 2 ft x 2 ft column load carring 550 kips (dead load) and 200 kips (live load). The foundation level is 5 ft below the ground surface. The gross allowable bearing capacity is 6 ksf. The unit of soil is 130 pcf. You are required to provide complete design calculations for bearing, shear, and flexure for the strip footing. Assume f' = 4 ksi, fy = 60 ksi.An 18 in square concrete column carries a factored ultimate compressive load of 640 k. It isto be supported on a 8 ft wide 12 ft long rectangular spread footing. Select appropriate valuesfor f′c and fy, then determine the required footing thickness and design the flexural reinforcingsteel. Show the results of your design in a sketch.
- The thickness and reinforcement of a spread footing are governed by structuralconcerns. Structural design is governed by the LRFD method, which means theseanalyses are based on the factored loads.Design a square pad footing with an overall depth of 600mm, cover to the reinforcements 50mm with 20mm diameter reinforcement bars in both directions. The footing carries a 400mm square column with a dead load of 1050KN and imposed load of 300KN. The safe bearing capacity of the soil is 170KN/m^2, fcu 30N/mm^2. Assume a unit weight of concrete to be 24KN/m^3 and footing weight 150KNA rectangular combined footing 8 ft * 20 ft is founded at a depth of 6 ft on a normally con-solidated sand deposit. The sand deposit is approximately 28 ft thick and overlies sandstone. CPT tests indicate the sand is relatively uniform below the proposed footing depth and theaverage tip resistance is 50 tsf. The total service load carried by the combined footing is480 k. Estimate the settlement of this footing.
- SS Soil Mechanics And Foundation Engineering The width of a square footing and the diameter of a circular footing are equal. If both the footings are placed on the surface of sandy soil, the ratio of the ultimate bearing capacity of the circular footing to that of the square footing will be7. A continuous strip footing bears on sand with groundwater one-half the footing width below the base of the footing. Which of the following changes will Increase the allowable bearing pressure? D B/2 PFT B SAND A) Embedment depth remains D, but the footing width is decreased. B) Embedment depth remains D, but the groundwater is raised to B/4 below the base of the footing. C) Embedment depth and groundwater remain D and B/2, but the unit weight of the sand is increased. D) Groundwater remains at B/2 below the base of the footing, but the embedment depth is decreased.QUESTION 2 a. A column 425 mm x 425 mm carries a characteristic axial load of 800 kN dead and 300KN imposed. A footing size of 2800mm x 2800mm and thickness of 500mm has been proposed, The allowable bearing pressure of the soil is 200KN/m2. You are required to: (i) check the suitability of the size and design the base against bending, punching shear (ii) Show in a sketch the reinforcement details provided.