A footing needs to support a 450mm square column. The column carries a service dead load of 450kN and a service live load of 280 kN. Use the following date; f'c = 28MPA, fy = 414 MPa; unit weight of soil = 17.5 kN/m^3, unit weight of concrete = 23.5 kN/m^3, allowable soil pressure = 250 kPa, depth of footing = 2.0 m and main bar diameter is 20 mm. Assume 800 mm thickness of footing and concrete cover of 75 mm. 1. Design a square footing. Use proper rounding off based on the discussion. a) length of the side of square footing in meters. Blank 1 b) computed effective depth in mm. Blank 2 c) height of concrete in mm. Blank 3 d) number of reinforcement. Blank 4 2. Compute the final effective depth if the width is limited to 1.50m. Use proper rounding off based on the discussion. a) d short in mm Blank 5 b) d long in mm Blank 6 Blank 1 Add your answer Blank 2 Add your answer Blank 3 Add your answer Blank 4 Add your answer Blank 5 Add your answer Blank 6 Add your answer

A footing needs to support a 450mm square column. The column carries a service dead load of 450kN and a service live load of 280 kN. Use the following date; f'c = 28MPA, fy = 414 MPa; unit weight of soil = 17.5 kN/m^3, unit weight of concrete = 23.5 kN/m^3, allowable soil pressure = 250 kPa, depth of footing = 2.0 m and main bar diameter is 20 mm. Assume 800 mm thickness of footing and concrete cover of 75 mm. 1. Design a square footing. Use proper rounding off based on the discussion. a) length of the side of square footing in meters. Blank 1 b) computed effective depth in mm. Blank 2 c) height of concrete in mm. Blank 3 d) number of reinforcement. Blank 4 2. Compute the final effective depth if the width is limited to 1.50m. Use proper rounding off based on the discussion. a) d short in mm Blank 5 b) d long in mm Blank 6 Blank 1 Add your answer Blank 2 Add your answer Blank 3 Add your answer Blank 4 Add your answer Blank 5 Add your answer Blank 6 Add your answer

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

Q.6 A column 12" square with fe' = 5 ksi reinforced with 8 #10 bars of fy= 60 ksi, supports a service load of 91.87 kips (factored load=113.17 kips). The allowable soil pressure is 3.904 k/ft. Design a square footing with base 5' below surface. Take unit weight of soil as 100 psf. (14)
A 300 mm x 400 mm column is to be supported by 534 m thick square footing @ its %3D center. Service DL = 680 kN, service LL = 458 kN, CC to bar centroid is 90 mm, fc' = 23 MPa and fy = 414 MPa. Consider the weight of the footing and soil to be 10.85% of the dead load.. SBC = 156 kPa 300 400 300 Determine the critical ultimate wide beam shear stress in MPa. Note: Present the width (B) in multiples of 100 mm. 000
A strap footing consists of two footings connected by strap beam. Allowable soil pressure is 450 kPa. Footing thickness is 600mm and the bottom of the footing is 1.5m below the ground. Assume soil weight to be 19 Kn/m3 and concrete weight to be 24 Kn/m³. Use f'c = 20.7 Mpa and fy = 414 Mpa. Use 1.2DL + 1.6LL. gog = galow - footing weight – soil weight. DL = 275 kN LL = 400 kN DL = 600 kN LL = 500 kN 4.8 m 400 x 400 column 400 x 400 column 1.2 m 1.2 m a) Calculate the footing dimensions. (Size is in multiples of 100 mm) b) Draw the Shear and Moment Diagram on the Longitudinal Direction. Show the maximum shear and moment.
A series of columns carrying unfactored vertical loads of 20 to 90 k and service loads from 20 to 75 k are to be supported on 3 ft deep square footings. The soil below is a clay with the follow-ing engineering properties: g = 105 lb/ft 3above the groundwater table and 110 lb/ft3below, su = 3,000 lb/ft2, Cr/(1 + e0) = 0.03 in the upper 10 ft and 0.05 below. Both soil strata areheavily overconsolidated. The groundwater table is 5 ft below the ground surface. The factorof safety against a bearing capacity failure must be at least 3. Determine the allowable bearingpressure, qA, using ASD.
a square footing is designed to support a 300-mm x 400-mm concrete column that sustains an axial dead load of 160 kn and an axial live load of 250-kn. the base of the footing is 1.50 m below the final grade line, the soil weight is 16 kn/m, the gross allowable soil pressure, qa is 210 kpa, and a surcharge of 30 kpa. use fy=415 mpa, fc= 28 mpa and flexure bars are 16 mm in diameterdetermine the minimum size of the footing. assume initial thickness of slab equal to 400mma. 1.2 mb. 1.5 mc. 1.7 md. 1.9 m determine the maximum ultimate wide beam shear stress of the following if b = 2 m, t = 600 mmdetermine the maximum ultimate punching shear stress of the footing if b = 2 m, t = 600 mm
Calculate the number of steel bars #6 in a square footing necessary to resist a factored moment of Mu = 60 T-m. The footing has the following characteristics. B = 2.6 m, Fy = 4200 kg/cm2, f'c = 250 kg/cm2, d = 42.5 cm. Assume that the footing is ductile and you can use the reduction factor of 0.9 O 12 O 14 O 21 O 17
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.
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)
A structural engineer finished a design of a library. They determine that each column will carry 1000 lbs. the soil beneath the footing has the properties: gamma= 130 pcf, c= 75psf, phi= 40 degrees. The groundwater table is of great depth so it’s no concern. Sketch figures. What is the minimum size of the footing for a factor of safety of 3? Case 1: assume square footing Case 2: assume round footing
A 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.
Subject: 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)
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