6 Concrete Frame Structures: Foundations and Piles

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Questions and Answers

What type of foundation is more capable of handling very heavy, concentrated loads?

  • Mat foundations
  • Pile foundations (correct)
  • Spread footings
  • Slab foundations

Spread footings are better than pile foundations for very heavy, concentrated loads.

False (B)

Name a type of structure that would typically require pile foundations.

High-rise building

In construction, pile foundations are used to support __________ loads more effectively than spread footings.

<p>heavy, concentrated</p> Signup and view all the answers

Match the types of foundations with their characteristics:

<p>Pile foundations = Support heavy, concentrated loads Spread footings = Distribute load across a wider area Slab foundations = Provide a continuous concrete surface Mat foundations = Support larger structures on soft soils</p> Signup and view all the answers

What is a key component of concrete frame structures?

<p>Steel reinforcement (A)</p> Signup and view all the answers

Foundations are unnecessary for building construction.

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

Name one type of foundation commonly used in building construction.

<p>Shallow foundation</p> Signup and view all the answers

Concrete frame structures are primarily made of _____ and reinforced with steel.

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

Match the following construction terms with their definitions:

<p>Foundation = The lowest part of a building that provides support Concrete = A building material made from cement, water, and aggregates Frame = A structure composed of columns and beams that supports a building Reinforcement = Material added to increase strength, often steel bars</p> Signup and view all the answers

What acts like a column in the context of building loads?

<p>The pile (D)</p> Signup and view all the answers

The bottom end of the pile rests on a weak layer of soil.

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

What is the key principle regarding the connection between the pile and the ground layers?

<p>The bottom end of the pile rests on the surface that is the intersection of a weak and strong layer.</p> Signup and view all the answers

The load of the building is transferred through the pile onto the __________ layer.

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

Match the following terms with their descriptions:

<p>Pile = Transfers the load of the building Weak Layer = The layer that provides less support Strong Layer = The layer that bears the load Building = The structure that generates the load</p> Signup and view all the answers

What characteristic is required for trees used in this context?

<p>Exceptionally straight trunks (B)</p> Signup and view all the answers

The pile length can exceed the length of a single tree.

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

What is the maximum pile length for the trees mentioned?

<p>0m</p> Signup and view all the answers

One cannot join together two tree ______.

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

Match the terms with their definitions:

<p>Trunk = Main structural support of a tree Pile Length = Length limited to a single tree Joining = Combining two trunks Straight = Having no curve or bend</p> Signup and view all the answers

What is poured into the gap between the precast concrete pile and the earth?

<p>Concrete grout (C)</p> Signup and view all the answers

Helical piles have straight blades attached to them.

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

What is the main material used for helical piles?

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

In step 2, a precast concrete pile is ______ or pushed into the hole.

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

What does it mean when a pile is driven 'till refusal'?

<p>The pile cannot be driven any further into the soil. (D)</p> Signup and view all the answers

Pile driving is a silent process that does not affect the surrounding soil.

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

What is a significant environmental impact of pile driving?

<p>Noise and vibrations in the soil</p> Signup and view all the answers

Piles need to be hammered into the ground till __________.

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

Match the following terms related to pile driving with their descriptions:

<p>Piles = Structural elements that are driven into the ground Refusal = Point at which a pile cannot be driven deeper Vibrations = Disturbances in the soil due to pile driving Noise = Loud sound produced during the pile driving process</p> Signup and view all the answers

Flashcards

Concrete Frames

Concrete frames provide the structural skeleton of a building, supporting its walls, floors, and roof. They consist of columns and beams made of reinforced concrete.

Foundations

Foundations transfer the weight of a structure to the ground, ensuring stability.

Structures

Structures are built to provide shelter and protection.

Reinforced Concrete

Reinforced concrete combines concrete with steel bars or mesh to increase strength and prevent cracking.

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Building Construction 2

Building Construction 2 is a second-semester course in architecture, focusing on the structural elements of buildings.

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Pile Foundation

A type of foundation used for structures with heavy, concentrated loads, like skyscrapers, bridges, and water tanks.

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Spread Footing

Foundation that distributes load over a wider area, typically used for lighter structures like houses.

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Load

Weight or force exerted on a structure by its contents or external factors.

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High-Rise Structure

Structures that rise tall, usually multiple floors.

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Bridge

Structures designed to span rivers, valleys, or roadways.

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Pile Length Limitation

The maximum length of a pile made from a single tree trunk.

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Tree Trunk Requirements for Piles

Trees used for piles must have exceptionally straight trunks to ensure stability and strength.

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Joining Tree Trunks for Longer Piles

The process of joining two or more tree trunks to create a longer pile is not possible in this context.

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Pile Length Determined by Tree Length

The length of a pile constructed from a single tree is always limited to the length of that individual tree.

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Maximum Pile Length

The maximum pile length in this context is limited to the length of a single tree trunk, denoted as 0m.

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Load Transfer through Piles

The transfer of weight from a building to a strong, supporting layer through a pile.

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Strong Layer

The soil layer that can safely support the weight of a building.

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Weak Layer

The soil layer that cannot safely support the weight of a building.

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Pile as a Column

A vertical structure made of soil that transfers the load of a building to the strong layer.

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Intersection of Weak and Strong Layer

The point where the pile rests on the boundary of a weak and strong layer.

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Pile Refusal

The point at which a pile can no longer be driven further into the ground despite applying force.

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Pile Driving

A pile is driven into the ground to provide support for a structure.

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Special Piles

Special piles are used when standard piles are not suitable, such as in challenging soil conditions or for specific structural requirements.

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Pile Driving Noise

A loud and disruptive process that involves hammering piles into the ground.

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Pile Driving Vibrations

The process of pile driving can cause vibrations that travel through the soil, potentially affecting nearby structures or utilities.

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Pile Installation

A method of installing precast concrete piles where they are lowered or pushed into the ground.

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Concrete Grout

A mixture of concrete and water that is poured into the gap between a pile and the surrounding soil to provide support and stability.

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Helical Pile

A type of foundation that consists of steel tubes with spiral blades, driven into the ground for support.

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Helical Blades

The spiral blades on a helical pile, designed to provide increased grip and stability in the ground.

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Study Notes

Concrete Frame Structures: Foundations

  • Concrete frame structures use foundations to support the building's weight
  • Foundations are crucial for transferring loads from the structure to the ground.

Deep Foundations

  • Used for high-rise buildings with large loads or unstable soil conditions

  • Pile foundations are columns of strong material like concrete, pushed into the ground

  • Two types of Pile Foundations:

    • Friction Pile Foundation: Transfers load to surrounding soil by friction.
    • End Bearing Pile Foundation: Transfers load to a strong layer of soil or rock below a weak layer at the bottom of the pile.
  • Pile foundations can support higher loads than spread footings.

  • Pile foundations are used in situations with weak surface soil or high concentrated loads (high-rise structures, bridges, water tanks)

Pile Materials

  • Piles can be made of wood, concrete, or steel
  • Wooden piles are suitable for supporting buildings in areas with weak soil. Commonly used for jetties.
  • Concrete piles are precast at ground level and driven into the ground.
  • Steel H-piles are driven into the ground; less time consuming because they don't require the casting process.

Pile Construction: Cast-in-place

  • A thin-walled steel tube is hammered into the ground.
  • Earth inside the tube is removed.
  • Reinforcement cage is placed inside the tube.
  • Wet concrete is poured into the tube to form the pile.
  • The steel tube (casing) is temporary for shaping the pile and support during pouring; removed later.

Pile Construction: Precast Driven Piles

  • Piles are cast at ground level, then hammered or driven into the ground using a pile driver.
  • Pile driver lifts and drops a heavy weight on the pile to drive it into the ground.
  • Piles are covered with a steel cap during driving to prevent disintegration.
  • Pile driving continues until refusal (cannot be driven further).

Pile Construction: Drilled Pier

  • Dry augering through self-supporting cohesive soil
  • Augering through water-bearing cohesionless soil with aid of slurry
  • Setting the casing
  • Dry augering into cohesive soil after sealing
  • Forming a bell

Special Piles

  • Micropiles/Minipiles: Smaller piles constructed by digging a hole, lowering a precast concrete pile into it, and filling the gap with grout.
  • Helical Piles: Steel tubes with helical spirals that act like a drill bit for driving into the ground.

Pile Usage and Design

  • Piles are designed carefully to account for the load-bearing capacity of the soil.
  • Piles must be spaced appropriately to evenly distribute loads throughout the soil.
  • Piles are often grouped and topped with a pile cap for distributed load transfer.

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