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A rectangular rcc column of size 600mm*400mmcarries a load of 800kn.design a rectangular footing to support this column use M15,fe250,LSM method and the safe bearing capacity of the soil is 200kn/m.?
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A rectangular rcc column of size 600mm*400mmcarries a load of 800kn.de...
To design a rectangular footing to support the column, we need to first determine the load that the footing needs to be able to bear.
The load on the footing is equal to the load on the column, which is 800 kN.
Next, we need to determine the size of the footing. The size of the footing is determined by the required bearing area, which is the area of the footing required to distribute the load safely on the soil.
The required bearing area can be calculated using the following formula:
A = F / q
Where:
A is the required bearing area (in square meters)
F is the load on the footing (in kN)
q is the safe bearing capacity of the soil (in kN/m2)
Substituting the given values, we get:
A = 800 kN / 200 kN/m2 = 4 m2
The dimensions of the footing can then be chosen such that they provide the required bearing area while minimizing the amount of concrete needed.
One option would be to use a footing that is 2 meters wide and 2 meters long, which would give us an area of 4 m2.
The thickness of the footing can then be determined using the recommended minimum thickness for the grade of concrete being used and the expected soil pressure.
For M15 concrete and a soil pressure of 200 kN/m2, the minimum recommended thickness is 250 mm. However, it is always recommended to consult a structural engineer or use a design software to properly design the footing and ensure that it is adequate for the load and soil conditions.
The Long Short Method can be used to calculate the amount of steel reinforcement needed in the footing. This method involves calculating the tension and compression forces in the footing and determining the amount of steel needed to provide sufficient strength and stability.
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A rectangular rcc column of size 600mm*400mmcarries a load of 800kn.de...
Design of Rectangular Footing for RCC Column
Given Data:
- Size of RCC Column = 600mm * 400mm
- Load carried by the column = 800kN
- Concrete grade = M15
- Steel grade = Fe250
- LSM method to be used
- Safe bearing capacity of soil = 200kN/m
Design Steps:
1. Determine the size of the footing
- Let the width of the footing be B and length be L
- Assume the depth of the footing as D
- The footing should be designed such that the load is transmitted to the soil without causing any settlement or shear failure
- As per LSM method, the minimum depth of footing can be taken as D = 1.5 * L/B
- Assume the width of the footing as B = 1.5 times the width of the column = 1.5 * 600 = 900mm
- Therefore, the length of the footing can be taken as L = B * D/1.5 = 900 * 600/1.5 = 3600mm
2. Check the bearing capacity of soil
- The safe bearing capacity of the soil is given as 200kN/m
- The total load on the footing is 800kN
- The area of the footing can be taken as A = B * L = 900 * 3600 = 3240000mm^2 or 3.24m^2
- The pressure intensity on the soil can be taken as P = 800/3.24 = 246.91kN/m^2 or 0.247N/mm^2
- As the pressure intensity is less than the safe bearing capacity of the soil, the footing size is safe
3. Determine the depth of the footing
- Assume the depth of the footing as 300mm
- Determine the effective depth of the footing as d = D - 50 = 250mm
- Provide the clear cover of 50mm on both sides of the footing
4. Determine the steel reinforcement
- As per the design, the steel grade is Fe250
- The area of steel required can be calculated as Ast = (0.5 * fy * B * d)/σst
- σst = 0.87 * fy / 1.15 = 203.48 N/mm^2 (as per LSM method)
- fy = 250 N/mm^2
- Therefore, Ast = (0.5 * 250 * 900 * 250)/203.48 = 657.70 mm^2
- Provide 12mm diameter bars at 150mm spacing in both directions, which gives a total area of 678.58 mm^2, which is more than the required area
5. Determine the size of the footing reinforcement
- Provide 12mm diameter bars at 150mm spacing in both directions for the entire depth of the footing
6. Check for bending and shear
- Determine the moment of resistance of the footing as MR = Ast * σst * (d - 0.5 * Ast/σst)
- MR = 678.58 * 203.48 * (250 - 0.5 * 678.58/203.48) = 75.12 kNm
- The maximum moment on the footing can be taken as M =
Given Data:
- Size of RCC Column = 600mm * 400mm
- Load carried by the column = 800kN
- Concrete grade = M15
- Steel grade = Fe250
- LSM method to be used
- Safe bearing capacity of soil = 200kN/m
Design Steps:
1. Determine the size of the footing
- Let the width of the footing be B and length be L
- Assume the depth of the footing as D
- The footing should be designed such that the load is transmitted to the soil without causing any settlement or shear failure
- As per LSM method, the minimum depth of footing can be taken as D = 1.5 * L/B
- Assume the width of the footing as B = 1.5 times the width of the column = 1.5 * 600 = 900mm
- Therefore, the length of the footing can be taken as L = B * D/1.5 = 900 * 600/1.5 = 3600mm
2. Check the bearing capacity of soil
- The safe bearing capacity of the soil is given as 200kN/m
- The total load on the footing is 800kN
- The area of the footing can be taken as A = B * L = 900 * 3600 = 3240000mm^2 or 3.24m^2
- The pressure intensity on the soil can be taken as P = 800/3.24 = 246.91kN/m^2 or 0.247N/mm^2
- As the pressure intensity is less than the safe bearing capacity of the soil, the footing size is safe
3. Determine the depth of the footing
- Assume the depth of the footing as 300mm
- Determine the effective depth of the footing as d = D - 50 = 250mm
- Provide the clear cover of 50mm on both sides of the footing
4. Determine the steel reinforcement
- As per the design, the steel grade is Fe250
- The area of steel required can be calculated as Ast = (0.5 * fy * B * d)/σst
- σst = 0.87 * fy / 1.15 = 203.48 N/mm^2 (as per LSM method)
- fy = 250 N/mm^2
- Therefore, Ast = (0.5 * 250 * 900 * 250)/203.48 = 657.70 mm^2
- Provide 12mm diameter bars at 150mm spacing in both directions, which gives a total area of 678.58 mm^2, which is more than the required area
5. Determine the size of the footing reinforcement
- Provide 12mm diameter bars at 150mm spacing in both directions for the entire depth of the footing
6. Check for bending and shear
- Determine the moment of resistance of the footing as MR = Ast * σst * (d - 0.5 * Ast/σst)
- MR = 678.58 * 203.48 * (250 - 0.5 * 678.58/203.48) = 75.12 kNm
- The maximum moment on the footing can be taken as M =
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A rectangular rcc column of size 600mm*400mmcarries a load of 800kn.design a rectangular footing to support this column use M15,fe250,LSM method and the safe bearing capacity of the soil is 200kn/m.?
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A rectangular rcc column of size 600mm*400mmcarries a load of 800kn.design a rectangular footing to support this column use M15,fe250,LSM method and the safe bearing capacity of the soil is 200kn/m.? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about A rectangular rcc column of size 600mm*400mmcarries a load of 800kn.design a rectangular footing to support this column use M15,fe250,LSM method and the safe bearing capacity of the soil is 200kn/m.? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A rectangular rcc column of size 600mm*400mmcarries a load of 800kn.design a rectangular footing to support this column use M15,fe250,LSM method and the safe bearing capacity of the soil is 200kn/m.?.
A rectangular rcc column of size 600mm*400mmcarries a load of 800kn.design a rectangular footing to support this column use M15,fe250,LSM method and the safe bearing capacity of the soil is 200kn/m.? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about A rectangular rcc column of size 600mm*400mmcarries a load of 800kn.design a rectangular footing to support this column use M15,fe250,LSM method and the safe bearing capacity of the soil is 200kn/m.? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A rectangular rcc column of size 600mm*400mmcarries a load of 800kn.design a rectangular footing to support this column use M15,fe250,LSM method and the safe bearing capacity of the soil is 200kn/m.?.
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