i. A 550mm x 550mm column carries service dead load of 1300kN and service live load of 1100 kN. The column is to be supported by square footing having a thickness of 475mm and whose bottom is 1.75m below the ground. Allowable soil bearing capacity at the base of footing is 250kPa. Unit of weight of soil above footing is 18.3kN/m³. Use fc' = 28MPa and fy = 415MPa. Use 100mm steel cover. Determine the following: 1. Minimum soil bearing capacity so that footing length shall not exceed 4 meters? 2. Using the given soil bearing capacity, what is the design dimension of square footing? 3. Determine how many 28mm dia. rebars to be used bothways as continued from your answer in #2. 4. Is the footing thickness safe against punching shear? If so, determine the punching shear capacity of the section.

i. A 550mm x 550mm column carries service dead load of 1300kN and service live load of 1100 kN. The column is to be supported by square footing having a thickness of 475mm and whose bottom is 1.75m below the ground. Allowable soil bearing capacity at the base of footing is 250kPa. Unit of weight of soil above footing is 18.3kN/m³. Use fc' = 28MPa and fy = 415MPa. Use 100mm steel cover. Determine the following: 1. Minimum soil bearing capacity so that footing length shall not exceed 4 meters? 2. Using the given soil bearing capacity, what is the design dimension of square footing? 3. Determine how many 28mm dia. rebars to be used bothways as continued from your answer in #2. 4. Is the footing thickness safe against punching shear? If so, determine the punching shear capacity of the section.

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 column 500 mm x 500 mm square is supported by a 3.5 m x 3.5 m isolated spread footing. The column carries a dead load of 1200 kN and a live load of 1000 kN. The total depth of the footing is 550 mm with steel cover of 100 mm. Use NSCP 2001 provisions. Determine the punching shear stress at ultimate loads. A 1830.00 kPa 2154.11 kPa 1566.48 kPa D 1331.52 kPa
You are to desigh a square footing having properties as given: Dimensions: B-2m a=0.6m b=1m c-0.4m Column toads: My P (kN) (kN- m) Dead Load 230 48 Live Load 120 28 Earthquake 25 220 Load Determine the maximum net soil pressure in kPa..
A square column footing is to support a 500 mm square tied column that carries a dead load 1000 KN and a live load of 810 KN, the column is reinforced with 8 – 25 mm bars. The base of the footing is 1.50 m below the natural grade where the allowable soil pressure is 235 Kpa. The soil above the footing has a weight of 15.6 kn / cu.m. Assume fy = 27.5 Mpa, fc = 27.5 Mpa, and unit weight of concrete as 23.50 kn/cu.m, design the footing. Use 25 mm main bars.
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 3.6 m square footing is proposed to be used to support a 530 mm x 309 mm RC column loaded with 704 kN dead load and 530 kN live load. The bottom of the footing is 1.5 m below the ground. Assume soil weighs 19 kN/m3 and the allowable soil bearing pressure is 312 kPa. The thickness of the footing is 525 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 %3D 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) Answer in 4 decimal places (1.6125, 1.5140, 0.8461, etc.)
Design a square pad footing with an overall depth of 600mm, cover to the reinforcements 50mm with 20mm diameter reinforcement bars in both directions. The footing carries a 400mm square column with a dead load of 1050KN and imposed load of 300KN. The safe bearing capacity of the soil is 170KN/m^2, fcu 30N/mm^2. Assume a unit weight of concrete to be 24KN/m^3 and footing weight 150KN
A square footing is proposed to be used to support a 500 mm x 395 mm RC column loaded with 666 kN dead load and 858 kN Ilive load. The bottom of the footing is 1.9 m below the ground. Assume soil weighs 19 kN/m3 and the allowable soil bearing pressure is 302 kPa. The thickness of the footing is 478 mm. f'.= 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. What is the size of the footing required in mm?
A 4.7 m square footing is proposed to be used to support a 398 mm x 398 mm RC column loaded with 860 kN dead load and 654 kN live load. The bottom of the footing is 2 m below the ground. Assume soil weighs 19 kN/m³ and the allowable soil bearing pressure is 285 kPa. The thickness of the footing is 552 mm. f = 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. Use an effective depth measured from the top of the footing until the center of the bottom-most bar Calculate the number of bars required in one direction. Provisions are given below for the minimum area of main reinforcements Reinforcement Type fy. MPa ima Nimist Deformed Bars < 420 MPa 0.0020A Deformed Bars and Welded Wire 2 420 MPa Reinforcement Greater of: 00018 x 420 0.0014A
A 400 mm x 400 mm column carries a total dead load of 1150 kN and a total live load of 770 kN. The column is to be supported by a rectangular spread footing having thickness of 675 mm whose width is limited to 3 m. The net soil bearing capacity of the soil is 215 kPa. For footing, use f'c = 24 MPa and for column, use f'c = 20.7 MPa. Use fy = 414 MPa for all steel bars. Use 75mm concrete cover. 11. Determine the length of the footing. 12. Determine wide beam shear stress at the critical section. 13. Determine the punching shear stress at the critical section. 14. Design the reinforcements using 25 mm bars, determine the number of reinforcements along the long direction. 15. Design the reinforcements using 25 mm bars, determine the number of reinforcements along the short direction.
A 3.5 m square footing is proposed to be used to support a 328 mm x 328 mm RC column loaded with 815 kN dead load and 770 kN live load. The bottom of the footing is 2 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 553 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. Use an effective depth measured from the top of the footing until the center of the bottom-most bar (d1) Calculate the number of bars required in one direction. Answer is 15 (Complete Solution)
A 3.3 m square footing is proposed to be used to support a 435 mm x 435 mm RC column loaded with 585 kN dead load and 643 kN live load. The bottom of the footing is 2 m below the ground. Assume soil weighs 19 kN/m3 and the allowable soil bearing pressure is 290 kPa. The thickness of the footing is 459 mm. f'. = 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. Use an effective depth measured from the top of the footing until the center of the bottom-most bar (d1) Calculate the number of bars required in one direction. Answer in multiples of 1
7. A reinforced concrete square footing supports a 400mm x 400mm square column carrying a total dead load of 740kN and a total live load of 1120kN. The footing dimension is 3m x 3m and is supported by 9 piles 1m apart on a 3x3 formation. The effective depth of the footing is 700mm. Take f’C = 28MPa for concrete and fy = 415MPa for steel. a. Determine the factored load on each pile. b. Determine the nominal wide beam shear stress to be resisted by the footing. c. Determine the nominal punching shear stress to be resisted by the footing. d. Determine the factored moment to be resisted by the footing.