12 Questions
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?
Curtain fall collapse
What is the most common type of masonry wall failure that occurs at fires?
Straight 90 degree collapse
What can cause a masonry wall to become unstable and lean inward?
Forces directed against the inside surface of the collapsing wall
Which of the following is true about the collapse zone in relation to the height of the wall?
The collapse zone is twice the height of the wall.
What is a facade?
A fancy name for the front wall of a building.
What could cause a marquee to collapse and pull the parapet wall down?
Water filling the marquee.
Which type of wall is the least stable of the three basic beam designs?
Freestanding wall
What is the main purpose of a canopy?
To protect people from the weather
What is the most dangerous type of canopy according to the text?
Canopy made of metal shed suspended over a truck loading area
Which of the following is true about parapet walls?
Parapet walls are connected to the roof or floor beams behind the facade.
Which type of beam design is a parapet wall?
Cantilever beam
What can cause a canopy to collapse?
Excess weight from clogged drains in the hollow portion of the canopy.
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.
Test your knowledge on different types of masonry wall collapses, including straight 90-degree collapses and curtain falls inward/outward. Learn about the collapse zone and when to use heavy caliber streams. This quiz covers the most common types of masonry wall failures that occur during fires.
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