10 One-Way and Two-Way Slabs Quiz
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Questions and Answers

What is the primary bending direction of one-way slabs?

  • Both axes equally
  • Short axis
  • Long axis (correct)
  • None of the above

    • One-way slabs have an aspect ratio less than 2:1.

    False (B)

    Name two types of slabs mentioned.

    One-way slab and two-way slab

    One-way slabs are defined with an aspect ratio in plan of ___ or greater.

    <p>2:1</p> Signup and view all the answers

    Match the type of slab to its description.

    <p>One-way slab = Bending primarily about the long axis Two-way slab = Bending about both axes Waffle slab = A slab integrated with ribs for strength Flat slab = A slab without beams supporting it</p> Signup and view all the answers

    What is the classification of slabs that are supported on all four sides and have an L/S ratio less than 2?

    <p>Two-way slabs (A)</p> Signup and view all the answers

    Bending in two-way slabs occurs in a linear form.

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

    What type of reinforcement is required in two directions for two-way slabs?

    <p>Main reinforcement</p> Signup and view all the answers

    Two-way slabs are defined as those with an L/S ratio less than _____ and supported on all four sides.

    <p>2</p> Signup and view all the answers

    Match the following characteristics with the type of slab:

    <p>Supported on all four sides = Two-way slab Bending occurs in one direction = One-way slab Requires reinforcement in both directions = Two-way slab L/S ratio greater than 2 = One-way slab</p> Signup and view all the answers

    What is the primary function of carpenter's formwork?

    <p>To hold concrete until it sets (B)</p> Signup and view all the answers

    A slab sitting on a beam is typically considered to have a fixed support.

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

    What material is commonly used to build formwork on site?

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

    The term __________ is given to molds into which concrete is poured.

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

    Match the components with their descriptions:

    <p>Slab = A flat horizontal structure Beam = A horizontal support component Formwork = A mold for pouring concrete Timber = Wood used for construction</p> Signup and view all the answers

    What is the primary purpose of slabs in construction?

    <p>To provide flat and useful surfaces (C)</p> Signup and view all the answers

    Slabs are not used for pre-stressing in structural components.

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

    What structural feature is commonly applied to slabs?

    <p>Pre-stressing</p> Signup and view all the answers

    Slabs are used to provide flat and useful __________.

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

    Match the following terms with their descriptions:

    <p>Slabs = Flat surfaces used in construction Pre-stressing = Technique to enhance structural strength Structural component = Essential element in building frameworks Concrete = Common material used for slabs</p> Signup and view all the answers

    What is the primary dimension of slab S1?

    <p>4.40 m (C)</p> Signup and view all the answers

    The thickness of slab S1 is 300 mm.

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

    What is the secondary dimension of slab S1?

    <p>8.0 m</p> Signup and view all the answers

    The slab S1 is supported by beams b1 and b2, which are supported by column pairs C2, C4 and C1, C3 respectively. The thickness of slab S1 is _____ mm.

    <p>180</p> Signup and view all the answers

    Match the following elements to their roles in the structure:

    <p>S1 = Slab b1 and b2 = Beams C1, C3 = Column pair C2, C4 = Column pair</p> Signup and view all the answers

    Which of the following types of slabs curves under loads in one direction only?

    <p>One-way solid slabs (A)</p> Signup and view all the answers

    A two-way slab can only be supported by beams in one direction.

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

    What are the two categories of solid slabs?

    <p>One-way solid slabs and two-way solid slabs</p> Signup and view all the answers

    A ___ slab is supported by four beams and can curve under loads in different directions.

    <p>two-way</p> Signup and view all the answers

    Match the type of slab with its characteristic:

    <p>One-way solid slabs = Curves under load in one direction Two-way solid slabs = Supported by beams in both directions Ribbed slabs = Has reinforcing ribs under the slab Solid slabs = Continuous surface without ribbing</p> Signup and view all the answers

    Flashcards

    Slab

    A flat structural element typically used to provide a horizontal, load-bearing surface.

    Pre-stressing

    A technique used to enhance the strength of concrete structures by applying tensile forces.

    Use of Concrete Slabs

    Concrete slabs are often used in construction because they provide a flat, stable, and useful surface for various purposes.

    Concrete Slabs and Pre-stressing

    An important structural component where pre-stressing is applied.

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    Advantages of Pre-stressing Slabs

    The application of pre-stressing in concrete slabs helps to increase their load-bearing capacity and reduce cracking.

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    One-way slab

    A flat structural element that primarily bends along its longer side, typically with an aspect ratio of 2:1 or greater.

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    Two-way slab

    A flat structural element where bending occurs in two directions, usually with a square or nearly square shape.

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    Aspect ratio of a slab

    The ratio of the length to the width of a slab.

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    Waffle slab

    A slab with a grid or waffle-like pattern on its underside, often used for increased strength and reduced weight.

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    Flat slab

    A slab with a smooth, flat underside, commonly used for floors and roofs.

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    Two-way Slab Bending

    Two-way slabs bend like a dish, in two directions.

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    Two-way Slab Reinforcement

    In two-way slabs, reinforcement is needed in both directions to handle the bending forces.

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    L/S Ratio

    The ratio of the length to the width of the slab (L/S).

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    L/S < 2

    A slab where the L/S ratio is less than 2.

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    What is the primary dimension of a slab?

    The primary dimension of a slab refers to its length, measured along its longest side.

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    What is the secondary dimension of a slab?

    The secondary dimension of a slab refers to its width, measured perpendicular to its longest side.

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    What is a beam in construction?

    A beam is a horizontal structural element that supports a load, often a slab.

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    What is the purpose of columns in construction?

    Columns are vertical structural elements that transfer loads from beams or slabs to the foundation.

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    What is a slab in construction?

    A slab is a flat, horizontal structural element that is typically used for flooring or roofs.

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    Pinned support

    A support condition where the beam is free to rotate but not to translate. It's often assumed when a slab rests on a beam.

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    Formwork

    Temporary molds used to shape fresh concrete into its final form.

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    Timber formwork

    Wooden structures built on site for pouring concrete that are later removed.

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    Casting concrete

    The process of pouring concrete into the formwork.

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    Stripping formwork

    The process of removing the temporary formwork after the concrete has hardened.

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    Solid Slab

    A slab that has a solid, continuous surface without any ribs or beams. It can be either one-way or two-way.

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    Ribbed Slab

    A slab that has a series of ribs or beams built into its underside. It can be either one-way or two-way.

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    Study Notes

    One-Way and Two-Way Slabs

    • Slabs are important structural components, particularly where pre-stressing is used.
    • They provide flat, usable surfaces.
    • One-way slabs have an aspect ratio of 2:1 or greater in the plan.
    • Bending primarily happens along the longer axis.
    • If ribs are only in one direction, the slab is considered one-way.
    • A one-way slab is determined by L/S > 2 (where L is length and S is the shorter dimension).
    • One-way slabs can be solid, hollow, or ribbed.
    • Two-way slabs bend in two directions, commonly in a dish-like form.
    • Two-way slabs usually have supports on all sides.
    • Two-way slabs have L/S < 2 to be classified a two way slab.
    • Two-way slabs are commonly found in buildings supported by beams under the edges of the slab.

    Types of Slabs

    • Flat plates: Do not have beams between columns, but may have spandrel beams at the edges.
    • Flat slabs: Have no beams, but might have drop panels or column capitals.
    • Two-way slabs with beams: Contain beams between the columns.
      • If the beams are wide and shallow, they are called band beams.
      • For larger span construction, ribs might be used in both spanning directions of the slab, creating a waffle slab.

    Loading and Application of One-Way Slabs

    • Slabs supported on two opposite sides only induce loads perpendicular to the supporting beams.
    • If supports are provided on all sides, most load is carried along the shorter direction to the supporting beams, resulting in one-way action.

    One-Way Slab Layout and Application

    • Useful in architectural situations with limitations.
    • The simplest slab design.
    • Main reinforcement is placed in one direction, with less congestion than two-way slabs.

    Simply Supported One-Way Slabs

    • Structural frames have four columns, two beams, and one slab.
    • One-way slabs are supported by two beams.

    Formwork for One-way Slabs

    • Carpenter's formwork is temporary wooden molds for pouring concrete.
    • It is constructed onsite from timber.
    • Formwork drawings are designed for carpenter implementation and installer steel reinforcement placement.

    Slab S1 (Example)

    • Slab S1 is 180 mm thick.
    • The primary dimension is 4.40 m, secondary is 8.0 m.
    • It is supported by column pairs (C2, C4 and C1, C3).
    • Supports are typically pinned (when a slab sits on a beam).

    Two-way Slabs

    • A two way slab is one that spans in two direction.
    • If more beams are added, the slab becomes two way.

    Advantages of Flat Plates and Flat Slabs

    • Simpler formwork
    • Reduced obstructions for service conduits
    • Flexible interior layouts and future refurbishments.

    Waffle Slabs

    • Used for long span construction.
    • Ribs are used in both directions for support

    One-Way vs. Two-Way Ribbed Slabs

    • One-Way: Ribs in one direction
    • Two-Way: Ribs in two directions

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    Related Documents

    Lecture No. 10: One Way Slab & Two Way Slab PDF

    Description

    Test your knowledge of one-way and two-way slabs with this quiz. It covers aspects such as bending direction, classification, reinforcement requirements, and formwork materials. Perfect for civil engineering students and professionals seeking to refresh their understanding of slab design.

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