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Questions and Answers
What is a beam?
What is a beam?
A horizontal element of a structure that spans between one or more supports.
Which of the following is NOT a common purpose of a beam?
Which of the following is NOT a common purpose of a beam?
The most common geometry of a beam is rectangular.
The most common geometry of a beam is rectangular.
True (A)
In a rectangular beam, which dimension should be larger for optimal strength?
In a rectangular beam, which dimension should be larger for optimal strength?
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The depth of a beam should always be ______ than the width.
The depth of a beam should always be ______ than the width.
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What are the two primary criteria for beam design?
What are the two primary criteria for beam design?
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What is meant by deflection in a beam?
What is meant by deflection in a beam?
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What is the main difference between a plinth beam and a coping beam?
What is the main difference between a plinth beam and a coping beam?
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Match the type of beam with its description:
Match the type of beam with its description:
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What is the primary function of a sill beam?
What is the primary function of a sill beam?
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A lintel is a type of beam used to support the weight above door or window openings.
A lintel is a type of beam used to support the weight above door or window openings.
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What is the main difference between a simply supported beam and a continuous beam?
What is the main difference between a simply supported beam and a continuous beam?
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A cantilever beam is fixed at both ends.
A cantilever beam is fixed at both ends.
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Which of these is NOT an advantage of using a continuous beam?
Which of these is NOT an advantage of using a continuous beam?
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What is a pergola, and where is it typically found?
What is a pergola, and where is it typically found?
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A portal beam is a structure that combines an arch with a beam.
A portal beam is a structure that combines an arch with a beam.
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What is the main characteristic of an arch beam?
What is the main characteristic of an arch beam?
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Flashcards
Beam
Beam
A horizontal structural element that spans between supports.
Beam Function
Beam Function
Beams support loads above, below, or between them, or to connect structural elements.
Beam Types (based on function)
Beam Types (based on function)
Beams are categorized into types, including those in substructures (below plinth) and superstructures (above plinth).
Tie Beam
Tie Beam
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Ground Beam
Ground Beam
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Plinth Beam
Plinth Beam
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Sill Beam
Sill Beam
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Band Beam
Band Beam
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Lintel
Lintel
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Roof Beam
Roof Beam
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Hidden Beam
Hidden Beam
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Inverted Beam
Inverted Beam
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Coping Beam
Coping Beam
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Simply Supported Beam
Simply Supported Beam
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Cantilever Beam
Cantilever Beam
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Continuous Beam
Continuous Beam
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Overhang Beam
Overhang Beam
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Rectangular Beam
Rectangular Beam
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Pergola
Pergola
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Grid Beams
Grid Beams
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Portal Beam
Portal Beam
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Arch
Arch
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Normal Load Distribution
Normal Load Distribution
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Study Notes
Elements of Skeleton System: Beams
- A beam is a horizontal structural element that spans between one or more supports.
- Beams serve various purposes, including:
- Connecting columns
- Supporting masonry above
- Supporting slabs (both above and below)
- Supporting secondary beams
- Holding suspended accessories (e.g., electrical fixtures, cables, ducts, ceilings, water tanks)
Beam Geometry
- Rectangular geometry is the most common beam shape.
- Beam depth should always be greater than the width for strength.
- Width should be 115mm and depth 75mm for RCC framed structures.
Beam Design Criteria
- Beam depth is determined based on the maximum stress on the beam and deflection limits.
- Maximum stress must not exceed safe stress limits for the material.
- Deflection must not exceed specified limits.
Types of Beams
-
Beams are categorized based on their function:
- Below the plinth/In Substructure:
- Tie beam
- Ground beam
- Plinth beam (beam laid above foundation)
- Above the plinth/Superstructure:
- Sill beam (below the window)
- Band beam
- Lintel
- Roof beam
- Below the plinth/In Substructure:
-
Supporting masonry above:
- Beams are positioned along the perimeter of a building to span the columns, often supporting floor or roof loads.
-
Hidden Beam:
- Hidden beams are not visible after the slab is cast.
- They support masonry walls.
- They transfer wall load to main beams.
- Common situations for hidden beams include:
- Sunk slab for toilets
- Porch beams
- Staircase mid-landings
-
Coping Beam:
- Placed at the top of a masonry parapet wall to protect it from wear.
- Reinforced concrete coping beams have a rectangular shape.
- There is no component above a coping beam, rather the masonry continues.
Beam Classification
- Based on support pattern, beams are categorized as:
- Simply supported: Two supports
- Cantilever: One fixed support, one free end
- Continuous: Multiple supports (more than two)
- Overhanging: One or both ends extend beyond the supports
Simply Supported Beam
- A simply supported beam has pinned support at one end and roller support at the other.
- It undergoes shearing and bending depending on the applied load.
- Commonly seen in bridge decks and precast beams.
Continuous Beam
- A continuous beam has multiple supports along its entire span.
- It supports horizontal and vertical forces with zero bending moment at the end support.
- Used when span is long and building construction in fragments is not economical or plausible.
Beam Shapes
- Beams can be classified by plan shape into:
- Straight horizontal
- Straight inclined
- Curved
Unique Beams
- Pergola: Set of beams spaced closely with no slab above (primarily an architectural feature).
- Grid beams: Perpendicular sets of beams supporting a slab.
- Portal beam: Integrated beam structure with two columns.
- Arch: Compression member, often involving pre-stressed concrete.
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Description
This quiz focuses on the essential aspects of beams in structural engineering. You'll explore the geometry, design criteria, and various types of beams utilized in construction. Test your knowledge on how beams function and their importance in supporting structures.