Problem 2: Due to some site constraints, an L-shape footing is proposed. The footing is uniformly loaded with q = 100 kN/m². Compute the vertical stress increments under points A, B, and C at depth z = 10 m. 7 m B 13.5 m Plan View 6 m 12 m
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- 2) A square footing carries an allowable load of 59130kg including its own weight. The bottom of footing is 1.0m below ground surface and water table coincide with bottom of footing. Assume General shear failure. Unit Weight = 1846kg/cu.m c= 1605kg/sqm Nc = 35 Nq=22 Ny=19 1.0m Sat unit wt = 1956kg/cu.mA 2.0 m 2.0 m square pad footing will be placed in a normally consolidated clay soil to carry a column load Q. The depth of the footing is 1.0 m. The soil parameters are: c = 0, = 26, = 19 kN/m3, and cu = 60 kN/m2. Determine the maximum possible value for Q, considering short-term and long-term stability of the footing.Refer to the rectangular combined footing in Figure 10.1, with Q1 = 100 kip and Q2 = 150 kip. The distance between the two column loads L3 = 13.5 ft. The proximity of the property line at the left edge requires that L2 = 3.0 ft. The net allowable soil pressure is 2500 lb/ft2. Determine the breadth and length of a rectangular combined footing.
- A 2.0 m 2.0 m square pad footing will be placed in a normally consolidated clay soil to carry a column load Q. The depth of the footing is 1.0 m. The soil parameters are: c = 0, =26, = 19 kN/m3, cu = 60 kN/m2 (=0 condition). Determine the maximum possible value for Q, considering short-term and long-term stability of the footing.Q2. a) A 2 mx 2 m square footing is subjected to an axial load of 600 kN and a bending moment of 180 kNm as appears in Figure 2. The footing is located at 1.2 m deep in a cohesionless soil that has a friction angle of 35° and a saturated unit weight of 18.4 kN/m³. The water table is 2.7 m below the soil surface. Calculate the following, (i) Calculate the eccentricity of the load, (ii) Calculate and draw the soil contact pressure beneath the footing, (iii) Determine the factor of safety of the footing against the bearing capacity (use the general Meyerhof, bearing capacity equation). Assume the soil above water table is saturated. -600 KN /sat = 18.4 kN/m³ 1.2 m c'= 0 kPa, o'= 35° 1.5 m DI. 2 m M = 180 kNm Figure 23. A square footing which carries an axial load of 132530 kg has its bottom resting on a groundwater table at a depth of 2.5 m. from the ground surface as shown in the figure. Assume a general shear failure. Use: qu = 1.3cNc + yDfNq + 0.40YBNy a. Compute the width of the footing using Terzaghi's equation using a gross F.S. of 3. b. Compute the ultimate bearing capacity of the soil, in lb/ft² c. Compute the net factor of safety. d. Compute the net soil pressure, in psf Founda Dy 25m 132530 kg P=1846 kg/m³ C-1605 kg/m² 0-30' Pa 1965 kg/m³
- 7.16 A 650-kN column load is supported on a 1.5-m wide by 2.0-m long by 0.5 m deep spread footing. The soil below is a well graded, normally consolidated sand with y = 17.0 kN/m' and the following SPT N60 values: Depth (m) 1.0 2.0 3.0 4.0 5.0 N60 12 13 13 18 22 The groundwater table is at a depth of 25 m. Using Schmertmann's method and hand compu- tations, compute the total settlement at t = 30 yr.Determine the elastic settlement using the Schmertmann method of the 10'x 10' footing as shown below. Estimate the elastic modulus using Es = 10(N + 15), where Es is in ksf and N is the corrected SPT value. Loose sand Medium dense sand Loose sand Dense sand Very loose sand DEPTH 5° 10' 15' 20' 25' SPT 10 21 11 15 41 4 Q=250 kips 10' x 10' 0 0.2 0.4 0.6 STRAIN & Layer 1 Layer 2 Layer 3 Layer 4 Laver 5A rectangular footing has a dimensions shown and is acted upon by a dead load of 722 kN and a live load of 620 kN. The column dimension is 326 x 662 mm where he shorter dimension is parallel to B The thickness of the footing is 408mm. f'c=28 MPa and fy=420 MPa for diameter 20mm bars. A=3.1m and B=5.1m
- An eccentric footing shown has the following loads which acts on the center of the column: Pdl=400 kN Pll=650 kN Thickness of footing is 400mm f'c= 29 MPa; fy =420 MPa db=20mm Calculate the following: 1. The minimum and maximum soil pressure due to service loads 2. The minimum and maximum soil pressure due to factored loadsA rectangular footing 3m x 2m exerts a pressure of 100kN/m2on a cohesive soil Es= 5x104 kN/m2and µ = 0.5. Estimate the immediatesettlement at the centre, assuming(a) the footing is flexible (b) the footing is rigid (ii) Write about influence of water table in determination of bearing capacity.0:YA O A comprehensive.. Example (1): A strip footing of width 3 m is founded at a depth of 2 m below the ground surface in a (c - 0) soil having a cohesion c = 30 kN/m? and angle of shearing resistance o = 35°. The water table is at a depth of 5 m below ground level. The moist weight of soil above the water table is 17.25 kN/m. Determine (a) the ultimate bearing capacity of the soil, (b) the net bearing capacity, and (c) the net allowable bearing pressure and the load/m for a factor of safety of 3. Use the general shear failure theory of Terzaghi. Example (2): If the soil in Ex. (1) fails by local shear failure, determine the net safe bearing pressure. All the other data given in Ex. (1) remain the same. Example (3): If the water table in Ex. (1) rises to the ground level, determine the net safe bearing pressure of the footing. All the other data given in Ex. (1) remain the same. Assume the saturated unit weight of the soil ya= 18.5 kN/m'. Example (4): If the water table in Ex.1…