Concept explainers
Develop a spread sheet to compute allowable total vertical column loads using the ASD method and factored ultimate vertical column loads using LRFD. The spreadsheet should consider only vertical loads on a square or continuous footing bearing on single uniform soil. It should allow the input of footing width, depth, water table depth, soil strength parameters, a factor of safety for ASD, and a geotechnical resistance factor for LRFD. It should compute the bearing capacity based on both Terzaghi’s and Vesic "’s methods.
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- a square footing is to be constructed on a uniform thick deposit of clay with a unconfined compressive strength of 3kips/ft2. the footing will be located 5 ft below the ground surface and is designed to carry a total load of 300 kips. the unit weight of the supporting soil is 128lb/ft3. no groundwater was encountered during soil exploration. considering general shear, determine the square footing dimension, using a factor of safety of 3arrow_forwardExplain the method developed by Taylor(1948) fordetennining allowable bearing capacity of footings on sands ?arrow_forwardCompute the elastic settlement for a rigid 10 ft by 15 ft footing loaded with 4000 psf uniformly distributed bearing pressure on silty sand with Es = 1250 psi and ms = 0.3. The footing is located 6 ft below existing grade. Please note any assumptions.arrow_forward
- Redo Problem 16.13 with the following data: gross allowable load = 184,000 lb, = 121 lb/ft3, c = 0, =26, Df = 6.5 ft., and required factor of safety = 2.5. 16.13 A square footing (B B) must carry a gross allowable load of 1160 kN. The base of the footing is to be located at a depth of 2 m below the ground surface. If the required factor of safety is 4.5, determine the size of the footing. Use Terzaghis bearing capacity factors and assume general shear failure of soil. Given: = 17 kN/m3, c = 48 kN/m2, =31.arrow_forwardDefine the Normalized Load-Settlement Data for Medium Footing Load Tests ?arrow_forwardThe design column loads for a certain building range from 20 to 100 kN. The site for thisstructure is underlain by a silty sand with g = 18.2 kN/m3 , c′ = 2 kPA and f′ = 34°. The water table is at a great depth and footings are to be founded at a depth of 1.3 m.Determine the required footing width and allowable bearing pressure for the most lightlyloaded footing and the most heavily loaded footing using ASD with a factor of safetyof 2.5.arrow_forward
- 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.arrow_forwardDefine the ultimate bearing capacity equation for the general shear failure of soil in Terzaghi's analysis for a strip footing ?arrow_forwardDiscuss DESIGN OF SPREAD FOOTINGS AGAINST BEARING CAPACITY FAILUREarrow_forward
- A building column carries a factored ultimate vertical downward load of 320 k. It is to be sup-ported on a 3ft deep, square footing. The soil beneath this footing has the following properties: g = 20.5 kN/m3, c′ = 5 kPa, and f′ = 36°. The groundwater table is at a depth of 5 ft below the ground surface. Using LRFD, with a resistance factor of 0.5, compute the required footing width.arrow_forwardA proposed 1.5 m wide square footing will be built on sandy soil with c' = 0, Φ' = 35°, γt = 18.5 kN/m3, and N60 = 15. The footing will be placed at the ground surface where the groundwater table is at a depth of 2.0 m. Note: The location of the bedrock is not found, and the foundation is rigid. (a) Determine the maximum allowable column load that may be placed on this footing while maintaining a factor of safety of at least 2.5 against a bearing capacity failure. (b) Determine the maximum allowable column load that may be placed on this footing while maintaining a total settlement of no more than 15 mm. Hint: A simple elasticity approach may be used to calculate the settlement by considering the Poisson’s ratio of sandy soil, ? = 0.3. (c) Which controls the design, bearing capacity, or settlement? Explain.arrow_forwardA square footing will carry a design load of 3500kN. The footing is founded on a soil having a saturated unit weight of 21.5 kN/m3 and a cohesion of 45 kPa. The embedment depth of the footing is 1.7m and the water table rises to the ground surface. Using Terzaghi's Bearing capacity formula, what must be the perimeter of the footing's cross section so that the gross allowable soil pressure will not exceed with a factor of safety of 3? Use the following Terzaghi's bearing capacity factors: Nc-25.1, Nq=12.7, and Ny = 9.7. Assume a general shear failure.arrow_forward
- Principles of Geotechnical Engineering (MindTap C...Civil EngineeringISBN:9781305970939Author:Braja M. Das, Khaled SobhanPublisher:Cengage Learning