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A trapezoidal combined footing for two axially loaded columns is provided when
1. Width of the footing near the heavier column is restricted.
2. Length of the footing is restricted.
3. Projections of the footing beyond-the heavier column are restricted.
Select the correct answer using the codes given below:
1. Width of the footing near the heavier column is restricted.
2. Length of the footing is restricted.
3. Projections of the footing beyond-the heavier column are restricted.
Select the correct answer using the codes given below:
- a)1 and 2
- b)1 and 3
- c)2 and 3
- d)1, 2 and 3
Correct answer is option 'C'. Can you explain this answer?
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A trapezoidal combined footing for two axially loaded columns is provi...
Combined footing supporting two columns may be used for column on property lines or sewer line. In this case load will be eccentric.
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A trapezoidal combined footing for two axially loaded columns is provi...
Trapezoidal Combined Footing for Two Axially Loaded Columns
A trapezoidal combined footing is a type of foundation that is provided for two columns that are close together. It is used when one column is heavier than the other and the width of the footing near the heavier column is restricted, the length of the footing is restricted, and the projections of the footing beyond the heavier column are restricted.
Reasons for providing a trapezoidal combined footing:
1. Width of the footing near the heavier column is restricted:
The width of the footing near the heavier column is restricted because if the width is increased, it may lead to the overlapping of the footings of the two columns. This may cause unequal settlement of the columns and may not be safe.
2. Length of the footing is restricted:
The length of the footing is restricted because if the length is increased, it will lead to an increase in the bending moment at the junction of the two footings. This may cause the footing to fail.
3. Projections of the footing beyond the heavier column are restricted:
The projections of the footing beyond the heavier column are restricted because if the projection is increased, it will lead to a greater area of the footing. This may cause the soil to fail and may lead to unequal settlement of the columns.
Conclusion:
Therefore, a trapezoidal combined footing is provided when the width of the footing near the heavier column is restricted, the length of the footing is restricted, and the projections of the footing beyond the heavier column are restricted. This type of footing helps to distribute the load of the columns more evenly and helps to prevent unequal settlement.
A trapezoidal combined footing is a type of foundation that is provided for two columns that are close together. It is used when one column is heavier than the other and the width of the footing near the heavier column is restricted, the length of the footing is restricted, and the projections of the footing beyond the heavier column are restricted.
Reasons for providing a trapezoidal combined footing:
1. Width of the footing near the heavier column is restricted:
The width of the footing near the heavier column is restricted because if the width is increased, it may lead to the overlapping of the footings of the two columns. This may cause unequal settlement of the columns and may not be safe.
2. Length of the footing is restricted:
The length of the footing is restricted because if the length is increased, it will lead to an increase in the bending moment at the junction of the two footings. This may cause the footing to fail.
3. Projections of the footing beyond the heavier column are restricted:
The projections of the footing beyond the heavier column are restricted because if the projection is increased, it will lead to a greater area of the footing. This may cause the soil to fail and may lead to unequal settlement of the columns.
Conclusion:
Therefore, a trapezoidal combined footing is provided when the width of the footing near the heavier column is restricted, the length of the footing is restricted, and the projections of the footing beyond the heavier column are restricted. This type of footing helps to distribute the load of the columns more evenly and helps to prevent unequal settlement.
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A trapezoidal combined footing for two axially loaded columns is provided when1. Width of the footing near the heavier column is restricted.2. Length of the footing is restricted.3. Projections of the footing beyond-the heavier column are restricted.Select the correct answer using the codes given below:a)1 and 2b)1 and 3c)2 and 3d)1, 2 and 3Correct answer is option 'C'. Can you explain this answer?
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