Example 5 A square foundation (B * B) has to been constructed. Assume yd = 16.5 kN/m, Ysat = 18.55 kN/m³, o' = 34°, Dr = 1.22m and water table at 0.61m and the gross allowable load, Qail with FS = 3 is 667.2 kN Determine the size of the footing,

Example 5 A square foundation (B * B) has to been constructed. Assume yd = 16.5 kN/m, Ysat = 18.55 kN/m³, o' = 34°, Dr = 1.22m and water table at 0.61m and the gross allowable load, Qail with FS = 3 is 667.2 kN Determine the size of the footing,

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

A continuous footing with a B = 7.5ft is constructed with a Df of 3ft in a soil with the following properties: c' = 210 lb/ft? Y = 115 lb/ft³ Ø' = 25° If bedrock exists 6ft below grade use equation 7.2 to determine the ultimate bearing capacity.
Calculate the ultimate bearing capacity of a 2 m wide strip foundation embedded 2 m below the ground surface in soil with a saturated unit weight of 20 kN/m3. Dry unit weight of 18&N /m The water table is at the foundation level. The friction angle is 30°. 1. Calculate the bearing capacity of the foundation. 2. The design load on the foundation is 500 kPa. Comment on the safety of the foundation.
A circular footing with a 1.5 m diameter is to be constructed 1.2 m below the ground surface. Thesubsoil consists of a uniform deposit of dense soil having the following strength parameters.Angle of internal friction = 25o, Nc = 24.1 ; Nq =13.1 ; N = 9.1Unconfined compressive strength = 96 kN/m2Unit weight of soil = 20.12 kN/m3The ground water table is at great depth and its effect can be ignored.a) Compute the Ultimate bearing capacity of the soil.b) Compute the gross allowable bearing capacity of the soil using a factor of safety of 3.c) Compute the allowable load the footing could carry
A 3.4 m square footing is proposed to be used to support a 353 mm x 630 mm RC column loaded with 634 kN dead load and 853 kN live load. The bottom of the footing is 2.3 m below the ground. Assume soil weighs 19 kN/m³ and the allowable soil bearing pressure is 314 kPa. The thickness of the footing is 431 mm. f = 21 MPa and f = 420 MPa. It is to be reinforced with 20 mm diameter. Use 24 kN/m³ as the unit weight of concrete. Note: For two-way shear, use an effective depth measured from the top of the footing until the top of the bottom-most bar (d;) What is the ratio of the Demand Shear Force and the Capacity in Two Way Shear? (Vu/phiVn) Answer is 1.5881 (Complete Solution)
A 3.4 m square footing is proposed to be used to support a 353 mm x 630 mm RC column loaded with 634 kN dead load and 853 kN live load. The bottom of the footing is 2.3 m below the ground. Assume soil weighs 19 kN/m3 and the allowable soil bearing pressure is 314 kPa. The thickness of the footing is 431 mm. f'c = 21 MPa and fy = 420 MPa. It is to be reinforced with 20 mm diameter. Use 24 kN/m3 as the unit weight of concrete. Note: For two-way shear, use an effective depth measured from the top of the footing until the top of the bottom-most bar (d3) What is the ratio of the Demand Shear Force and the Capacity in Two Way Shear? (Vu/phiVn)
A column foundation is 3 m × 2 m in plan. Given: Dƒ = 1.5 m, þ' = 30°, c′ = 80 kN/m². Using the general bearing capacity equation (CFEM see class slides from March 17 similar to Example 1 and 2 but with an added capacity term related to cohesion) and 0.5, determine the factored bearing capacity of the foundation (i.e. – use Þ). Use Yw = 9.81 kN/m³. For simplicity, read the values of Nc, Ną, and Ny directly from the table on page 26 of the lecture slides use the highlighted columns. Also, determine the maximum factored load for the column. - 1.5 m ↑ 1 m 3m x 2m - y = 17 kN/m³ Groundwater level Ysat = 19.5 kN/m³ =
A building will have a factored column load of 300 kN. The column is to be supported on a square spread footing underlain by a soil with the follow properties: c' = 5 kPa, o' 35°, y = 18.5 kN/m³. The groundwater table is at a depth of 15 m and the footing will be located 0.5 m below the ground surface. Determine the required footing size if Þ = 0.5. Use Terzaghi's bearing capacity equation for a square footing. Solve for 'B', making sure to use the reduction factor Þ; trial and error is the easiest way to solve for 'B'. Recommend a "reasonable" dimension for construction/design purposes.
A square footing which carries an axial load of 132530 kg has its bottom resting on a ground water table at a depth of 2.5 m from the ground surface. Nc = 35, Nq = 22, Nγ = 19. Take PDRY = 1846 kg/m3 and PSAT = 1965 kg/m3, C = 1605 kg/m2. (Nc = 35, Nq = 22, Nγ = 19). Compute the required width of the footing using a factor of safety of 3.
A square footing having a dimension of 3.5m is supported by a soil with the following properties: ø = 17 degrees c = 45 kPa y1 = 17 kN/m3 Ysat = 20 kN/m3 The bottom of the footing is 1.9m below the ground surface. Use FS = 3 and Ywy w = 9.81 kN/m3. Using the general capacity equation or Meyerhof's Equation, If GWT is at the bottom of the footing, determine the gross allowable bearing capacity (in kPa). If the GWT is found 1m below ground surface, what is the gross allowable bearing capacity (in kPa)? If the GWT is found 4 m below ground surface, what is the gross allowable bearing capacity (in kPa)?
Design an isolated rectangular footing: P(dead load) = 225 kN P(live load) = 130 kN Qa = 180 kPa Df = 1.5 m Unit wt. of concrete = 23.5 kN/m^3 Unit wt. of soil =17.2 kN/m^3 Bar diameter = 20 mm f`c = 20.7 MPa fy = 248 MPa Width of footing, B is limited to 2m only Column = 40 cm x 40 cm Assume height of footing = 350 mm (check adequacy, if failed - increase the depth) Use min. cover = 75 mm Determine the following: (a) Effective Soil Bearing Pressure, Qe (b) Footing Dimension, L (c) Ultimate Soil Bearing Pressure, Qu (d) Check for Shear Criteria (Beam Shear) (e) Check for Shear Criteria (Punching Shear) (f) Required Steel Area (Long and Short Direction)
2. The column load of a square foundation (Figure 1) is given. If the depth of foundation D= 4 ft, 0=30°, and c = 0. Using Terzaghi's bearing capacity equation and FS = 2.5, determine the proper size of the footing. D.L. = 80 kip L.L. = 60 kip qult = 1.3 c N. + qN, + 0.4 y B N, Figure 1 TABLE 2.1 Terzaghi's Bearing Capacity Factors-Eqs. (2.32), (2.33), and (2.34) N. N, N. N. N, N. N, N, Ysoil = 118 pcf 2 ft W.T 1.00 0.00 17 14.60 0.01 18 15.12 1.22 0.04 19 | 16.57 6.62 1.35 0.06 20 | 17.69 1.49 0.10 21 | 18.92 |1.64 0.14 22 20.27 1.81 0.20 23 21.75 2.00 0.27 24 23.36 2.21 0.35 25 25.13 2.44 0.44 26 27.09 9.61 2.69 0.56 27 29.24 5.70 5.45 2.18 34 2.59 35 36 52.64 57.75 36.50 38.04 D; = 4m 6.00 1.1 6.04 41.44 45.41 6.30 6.70 3.07 63.53 47.16 54.36 3.64 4.31 38 5.09 39 70.01 77.50 85.97 95.66 106.81 65.27 78.61 95.03 3 7.44 37 53.80 8.26 9.19 61.55 70.61 4 6.97 5 7.34 3m x2m 6. 7.73 10.23 6.00 40 81.27 115.31 11.40 12.72| 8.34 8.15 7.08 41 93.85 140.51 171.99 211.56 8 8.60 42 119.67…
A square footing shown has the following details: Unit weight of soil = 15.28 kN/m3 Saturated unit weight of soil = 19.92 kN/m3 cohesion = 21.44 kPa %3D friction angle = 24 degrees %3D B = 2 meter Df = 2.45 meter P = 861 kN e/B = 0.12 --> one way eccentricity Calculate for the net allowable bearing capacity using FOS = 2.8. Use Meyerhof General Bearing Capacity Formula. D, B B Water table