Structural Analysis
6th Edition
ISBN: 9781337630931
Author: KASSIMALI, Aslam.
Publisher: Cengage,
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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)
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- Assume gamma=25 kN/m3 for concrete and 21 kN/m3 for the soilarrow_forwardTwo footings, one circular and the other strip, are founded on the surface of a purely Cohesionless soil. Diameter of the circular footing and width of strip footing is same. Then, the ratio of ultimate bearing capacity of circular to strip footing is:arrow_forwardPlease explain and number stepsarrow_forward
- 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)arrow_forwardFoundation and Retaining Wall Design 3 Decimal Placesarrow_forwardA 500 mm square concrete column carries a factored ultimate vertical column load of780 kN. The vertical service load is 650 kN. It is to be supported on a square footing withf′ c = 17 MPa and fy = 420 MPa. The soil has an allowable bearing pressure for bearing cap-acity of 650 kPa (based on LRFD methods) and an allowable bearing stress for settlement of 160 kPa. The groundwater table is at a great depth. Determine the required footing width, thick-ness, size of the flexural reinforcement, and show your design in a sketch.arrow_forward
- A square footing has a dimension of 1.78 m x 1.78 m and has its bottom 1.54 m below the ground surface. Compute for the gross allowable load in kg that the footing has to carry if it has a factor of safety of 2.86. Ground water table is located 0.73 m from the bottom of the footing. Soil Properties: c = 1,803 kg/m? Specific gravity, Gs= 2.67 Void ratio, e =0.47 - 30 degrees HINT: Use Dry unit weight for soil above the groundwater table. Unit weight of water 9.81 kN/marrow_forwardSubject: Principles of Foundation Design (Use NCSP) A rectangular footing is to be used to support a 300x400 (*400mm side is parallel to the long dimension of the footing) column loaded with 420 kN dead load and 540 kN live load. One side of the footing is 4.0m. Use effective soil pressure of 70 kPa. f'c=35 MPa and fy=420 MPa. Use minimum steel ratio for longitudinal bars as 0.0018. •Calculate the required thickness of the footing (mm) based on wide beam shear. db=16mm. Size of footing should be multiples of 10mm (Answer: 300) •Calculate the required thickness of the footing based on two-way shear. db=16mm (Answer: 430) • Calculate the required number of 16mm bars along long direction. . Use the governing thickness based on shear requirements. (Answer: 22)arrow_forwardUPVOTE will be given! STRENGTH OF MATERIALS A rectangular footing has a dimensions shown and is acted upon by a dead load of 1,929 kN and a live load of 1,515 kN. The column dimension is 317 x 667 mm where he shorter dimension is parallel to B The thickness of the footing is 566mm. f'c=28 MPa and fy=420 MPa for diameter 20mm bars. A=2.7m and B=4m Calculate the number of bars along the long direction?arrow_forward
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