Types of Building Foundations
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Questions and Answers

What is the primary function of a building foundation?

  • To enhance the aesthetic appeal of the building
  • To provide a decorative base for the structure
  • To support the weight of the building and transfer it to the ground (correct)
  • To protect the building from weather elements

Which of the following is NOT a type of shallow foundation?

  • Pile foundation (correct)
  • Individual footing
  • Strip foundation
  • Combined footing

Individual footings are only used for square columns.

False (B)

Combined footings are used when two or more columns are positioned ______ to each other, causing their individual footings to overlap.

<p>close</p> Signup and view all the answers

What is an advantage of using spread footings for buildings?

<p>They distribute the building's weight over a larger area (C)</p> Signup and view all the answers

What is the primary characteristic of a raft foundation?

<p>It supports the entire area beneath a building (C)</p> Signup and view all the answers

Pile foundations are a common type of foundation used for buildings built on stable, shallow soil.

<p>False (B)</p> Signup and view all the answers

What is the main purpose of pile foundations in building construction?

<p>To transfer structural loads to hard rock strata located deep beneath the ground surface, ensuring stability and integrity of the structure.</p> Signup and view all the answers

Which of the following is NOT considered an advantage of using deep foundations?

<p>They are generally less expensive than shallow foundations (D)</p> Signup and view all the answers

Drilled shafts, also known as ______, are a type of deep foundation that provide high load-carrying capacity.

<p>caissons</p> Signup and view all the answers

Flashcards

Foundation

Essential structural element supporting a building's weight and transferring it to the ground, ensuring stability and safety.

Shallow Foundation

Foundation type where the supporting structure is close to the ground surface.

Deep Foundation

Foundation type where the supporting structure extends deep into the ground.

Individual Footing

Shallow foundation supporting a single column, often square or rectangular.

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Combined Footing

Shallow foundation supporting two or more closely spaced columns.

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Strip Foundation

Shallow foundation supporting a continuous wall.

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Raft Foundation

Shallow foundation covering the entire area beneath a building, supporting substantial loads.

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Pile Foundation

Deep foundation using piles to transfer loads to deeper, stable soil.

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Drilled Shaft

Deep foundation, similar to piles, but often with higher load capacity.

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Soil Bearing Capacity

Measure of the soil's ability to support loads.

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Foundation Stability

Resistance of the foundation against settlement or other failures.

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Foundation Settlement

Sinking or uneven settling of a foundation.

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Spread Footing

Wide base shallow foundation for columns, walls, or piers.

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Groundwater Table

Level below which the ground is saturated with water.

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Load Distribution

Spreading a load over a wider area for better stability.

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Differential Settlement

Uneven settlement of different parts of a foundation.

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Load Bearing Capacity

Maximum load a foundation can bear without failure.

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Ground Conditions

Characteristics of the soil and geological features.

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Deep soil layer

Soil that is well below the ground surface.

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Study Notes

Types of Building Foundations

  • Foundations are structural elements supporting a building, transferring weight to the ground for stability.
  • Foundation type depends on soil conditions and intended building use.
  • Different types distribute loads over larger areas or prevent settlement.

Shallow Foundations

  • Individual or Isolated Footing: Common foundation type, designed for single columns (pad foundations). Shape is determined by soil capacity and column load, often rectangular or square.
  • Combined Footing: Used when multiple columns are close together to avoid individual footings overlapping. Typically rectangular, distributing loads across the combined footing.
  • Strip Foundation: Wider footing for load-bearing walls or bridge piers. The broader base distributes load over a larger area, ideal for bearing soil layers close to the ground surface.
  • Raft or Mat Foundation: Covers the entire building area, supporting heavy structural loads from columns and walls. This prevents differential settlement, ideal for large loads or poor soil conditions. Useful for buildings with heavy loads or unstable soil.

Deep Foundations

  • Pile Foundation: Transfers loads deeply beneath the ground surface (hard rock strata). Supports heavy loads and prevents uplift (earthquakes, strong winds).
  • Drilled Shafts or Caissons: Deep foundation alternative with high load-carrying capacity, resisting structural loads through shaft and toe resistance. Best suited for column loads exceeding pile foundation's capacity. Suitable for challenging-to-stabilize formations.

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Description

Explore the various types of building foundations, including shallow foundations such as individual footings, combined footings, strip foundations, and raft foundations. Understand how each type is designed based on soil conditions and building usage to ensure stability and load distribution.

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