A 2.5m x 2.5m square footing supports a 250mm x 400mm column. Given data: Thickness of footing -0.70m Total factored axial load -1,818 kN Materials: Concrete.fc - 20.7 MPa Steel bars, fy - 280 MPa (20mm diameter both ways) Clear bar covering - 75 mm Strength reduction factors -0.75 for shear -0.90 for bending a. Calculate the actual nominal shear stress in the footing (MPa) at the critical section for beam shear action. b. Calculate the actual ultimate shear stress in the footing (MPa) at the critical section for beam shear action. c. Calculate the actual nominal shear stress in the footing (MPa) at the critical section for punch shear action. d. Calculate the actual nominal shear stress in the footing (MPa) at the critical section for punch shear action. e. Calculate the required number of 20mm bars

A 2.5m x 2.5m square footing supports a 250mm x 400mm column. Given data: Thickness of footing -0.70m Total factored axial load -1,818 kN Materials: Concrete.fc - 20.7 MPa Steel bars, fy - 280 MPa (20mm diameter both ways) Clear bar covering - 75 mm Strength reduction factors -0.75 for shear -0.90 for bending a. Calculate the actual nominal shear stress in the footing (MPa) at the critical section for beam shear action. b. Calculate the actual ultimate shear stress in the footing (MPa) at the critical section for beam shear action. c. Calculate the actual nominal shear stress in the footing (MPa) at the critical section for punch shear action. d. Calculate the actual nominal shear stress in the footing (MPa) at the critical section for punch shear action. e. Calculate the required number of 20mm bars

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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PROBLEM 1 A square footing 2.4m x 2.4m x 0.45m thick supports a rectangular column 0.35m x 0.40m at its center. Column loads at service condition are: DL = 680KN LL = 400KN Fc' = 20.70 Mpa Fy = 275 Mpa Concrete cover to centroid of steel reinforcement is 100mm. Calculate : 1. maximum wide beam shear stress 2. What is the maximum punching stress 3. Determine the number of 20mm diameter bars required for critical moment.
A footing of size 2.5 m x 2.5 m and 500 mm thick resists characteristic axial loads of 800kN dead and 300 kN imposed from a 400 mm square column. The safe bearing pressure on the soil is 230 kN/m2 and the characteristic material strengths are fcu = 35 N/mm2, fy=460N/mm2. Density of concrete is 24 k N/m3. Cover to all reinforcement is 50 mm. Determine the design load b) Check whether the base pressure is safe c) Design the bending reinforcement, assuming 16 mm diameter bars.
30) A rectangular footing 2.1 m x 3.6 m x 0.35 m thick supports a 300 mm square column at its center. Column loads are service conditions: DL = 346 kN LL = 231 kN f’c = 21 MPa fy = 415 MPa Concrete cover to the centroid of steel reinforcement = 100 mm Calculate the nominal punching shear stress in the slab. Write your final answer with 2 decimal places if the unit is MPA.
a square footing 2.4 m x 0.34 m thick supports a 300 mm square column at its center. column loads are service conditions:DL = 376 kN LL = 213 kN f'c = 21 MPa fy = 415 MPa Concrete cover to the centroid of steel reinforcement = 100 mm calculate the nominal one way shear stress in the slab. write your final answer with 2 decimal places if the unit is MPA.
A rectangular footing 2.1 m x 3.6 m x 0.35 m thick supports a 300 mm square column at its center. Column loads are service conditions: DL = 346 kN LL = 231 kN f'c = 21 MPa fy = 415 MPa Concrete cover to the centroid of steel reinforcement = 100 mm Calculate the nominal punching shear stress in the slab. Write your final answer with 2 decimal places if the unit is MPA. Selected Answer: O 1.92 Correct Answer: 1.83 ±0.01
A square footing 2.5m x 2.5 m supports a square column 300mm x 300mm at its center. Concrete cover to bar centroid = 100mm. Ultimate load combination is 1.2DL + 1.6L. Column loads aee service conditions: DL= 680 KN LL = 400KN f'c = 20.7 Mpa fy = 275 MPa Calculate the nominal punching-shear stress acting at the critical section of the footing slab if the thickness of the slab is 450 mm.
A square footing 2.5m x 2.5 m supports a square column 300mm x 300mm at its center. Concrete cover to bar centroid = 100mm. Ultimate load combination is 1.2DL + 1.6L. Column loads aee service conditions:DL = 680 kN LL = 400kNf'c = 20.7 Mpa fy = 275 MPa Calculate the nominal punching-shear stress acting at the critical section of the footing slab if the thickness of the slab is 450 mm. (Correct Answer 1.99)
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Problem 4 A footing supports a 200mm thick concrete wall. Wall loads: = 175 Dead Load kN/m 89 %D Live Load kN/m = 20.6 %3D Concrete, f'c MPа = 415 Steel, fy MPа Unit weight = 23.6 of concrete kN/m3 Factored = 1.2D load + 1.6L combination Thickness of = footing 350mm Steel Cover ( bottom of footing to centroid of 90mm bars)
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QUESTION 2 a. A column 425 mm x 425 mm carries a characteristic axial load of 800 kN dead and 300KN imposed. A footing size of 2800mm x 2800mm and thickness of 500mm has been proposed, The allowable bearing pressure of the soil is 200KN/m2. You are required to: (i) check the suitability of the size and design the base against bending, punching shear (ii) Show in a sketch the reinforcement details provided.
a square footing 2.4 m x 2.4 m x 0.45 m thick supports a 300 mm square column at its center. column loads are at service conditions dl = 346 kn, ll = 231 kn, fc' = 21 mpa, and fy = 415 mpa. concrete cover to the centroid of steel reinforcement is 100 mm. calculate the nominal one way shear stress in the slab