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When the allowable soil is low or the building loads are heavy, the footing used is ___________
- a)Raft footing
- b)Strap footing
- c)Trapezoidal combined footing
- d)Rectangular combined footing
Correct answer is option 'A'. Can you explain this answer?
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When the allowable soil is low or the building loads are heavy, the fo...
When the allowable soil pressure is low, or the building loads are heavy, the use of spread footings would cover more than one-half of the area and it may prove more economical to use mat or raft foundation.
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When the allowable soil is low or the building loads are heavy, the fo...
Raft Footing
Raft footing is a type of foundation that is used when the allowable soil pressure is low or when the building loads are heavy. It is also known as mat foundation and is a large concrete slab that extends over the entire area of the structure it supports. Here are some key points to understand why raft footing is used in such conditions:
- Distributing Load: Raft footing is designed to distribute the building loads over a larger area of soil, which helps in reducing the pressure on the soil. This is particularly useful when the allowable soil pressure is low.
- Uniform Settlement: Since raft footing spreads the loads over a larger area, it helps in achieving uniform settlement of the structure. This is important to prevent differential settlement that can lead to structural issues.
- Heavy Loads: Raft footing is suitable for structures with heavy loads because it can effectively distribute these loads over a larger area, reducing the risk of overloading the soil.
- Stability: Raft footing provides stability to the structure by creating a large base that resists overturning and sliding forces. This is important in areas where the soil conditions may not be favorable for other types of footings.
In conclusion, raft footing is the preferred choice when dealing with low allowable soil pressure or heavy building loads due to its ability to distribute loads effectively and provide stability to the structure.
Raft footing is a type of foundation that is used when the allowable soil pressure is low or when the building loads are heavy. It is also known as mat foundation and is a large concrete slab that extends over the entire area of the structure it supports. Here are some key points to understand why raft footing is used in such conditions:
- Distributing Load: Raft footing is designed to distribute the building loads over a larger area of soil, which helps in reducing the pressure on the soil. This is particularly useful when the allowable soil pressure is low.
- Uniform Settlement: Since raft footing spreads the loads over a larger area, it helps in achieving uniform settlement of the structure. This is important to prevent differential settlement that can lead to structural issues.
- Heavy Loads: Raft footing is suitable for structures with heavy loads because it can effectively distribute these loads over a larger area, reducing the risk of overloading the soil.
- Stability: Raft footing provides stability to the structure by creating a large base that resists overturning and sliding forces. This is important in areas where the soil conditions may not be favorable for other types of footings.
In conclusion, raft footing is the preferred choice when dealing with low allowable soil pressure or heavy building loads due to its ability to distribute loads effectively and provide stability to the structure.
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When the allowable soil is low or the building loads are heavy, the footing used is ___________a)Raft footingb)Strap footingc)Trapezoidal combined footingd)Rectangular combined footingCorrect answer is option 'A'. Can you explain this answer?
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