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Questions and Answers
Which type of masonry wall collapse occurs when an exterior wall drops like a falling curtain forming a pile on the ground near the base of the wall?
Which type of masonry wall collapse occurs when an exterior wall drops like a falling curtain forming a pile on the ground near the base of the wall?
- Inward/outward collapse
- Straight 90 degree collapse
- Curtain fall collapse (correct)
- Secondary collapse
What is the most common type of masonry wall failure that occurs at fires?
What is the most common type of masonry wall failure that occurs at fires?
- Secondary collapse
- Curtain fall collapse
- Inward/outward collapse
- Straight 90 degree collapse (correct)
What can cause a masonry wall to become unstable and lean inward?
What can cause a masonry wall to become unstable and lean inward?
- Uneven settling of the foundation
- Forces directed against the inside surface of the collapsing wall (correct)
- Explosion or roof collapse
- Forces directed against the outside surface of the wall
Which of the following is true about the collapse zone in relation to the height of the wall?
Which of the following is true about the collapse zone in relation to the height of the wall?
What is a facade?
What is a facade?
What could cause a marquee to collapse and pull the parapet wall down?
What could cause a marquee to collapse and pull the parapet wall down?
Which type of wall is the least stable of the three basic beam designs?
Which type of wall is the least stable of the three basic beam designs?
What is the main purpose of a canopy?
What is the main purpose of a canopy?
What is the most dangerous type of canopy according to the text?
What is the most dangerous type of canopy according to the text?
Which of the following is true about parapet walls?
Which of the following is true about parapet walls?
Which type of beam design is a parapet wall?
Which type of beam design is a parapet wall?
What can cause a canopy to collapse?
What can cause a canopy to collapse?
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Study Notes
Masonry Wall Collapse
- A facade collapse occurs when an exterior wall drops like a falling curtain, forming a pile on the ground near the base of the wall.
- The most common type of masonry wall failure at fires is a facade collapse.
Masonry Wall Instability
- A masonry wall can become unstable and lean inward due to a lack of lateral support.
Collapse Zone
- The collapse zone is typically 1.5 to 2 times the height of the wall.
Building Features
- A facade is the exterior wall of a building.
- A marquee is a structure that provides shelter over an entrance.
- A canopy is a projecting roof that provides protection from the elements.
Beam Designs
- The three basic beam designs are: cantilever, fixed-fixed, and simple span.
- A cantilever beam is the least stable of the three basic beam designs.
- A parapet wall is a type of cantilever beam.
Canopy Collapse
- A canopy can collapse due to a lack of maintenance, rust, or excessive weight.
- The most dangerous type of canopy is a rusted canopy.
Parapet Walls
- Parapet walls are prone to collapse, especially when they are not properly anchored to the building.
- Parapet walls can pull the surrounding structure down with them when they collapse.
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