Dunn Flashcards
The fire resistance of a floor is directly related to its ____.
Mass
What is the structural hierarchy of a floor system. Least critical to most important?
Floor deck
beam
Girder
Column
lightweight floor beams can be spaced ____or _____ apart
2’ or 4’
What are the 3 ways a floor can fail during a fire
Floor deck collapse
Floor beam collapse
Multi level floor collapse
Floor beams supported at each end by bearing walls are called ….?
Simple beams
A beam than runs from bearing wall to bearing wall that is supported in the center by a girder and columns is called?…
A continuous beam
A beam pulling away from one bearing wall and resting on furnishings or content would be called what type of collapse?
A supported lean-to collapse
What would cause an unsupported lean-to collapse?
A bearing wall failure
What can cause a tent floor collapse can be caused by..?
An explosion resulting in bearing wall failure
Floor collapse resulting from an overloaded center floor would be…?
V-shape floor collapse
What can cause a pancake floor collapse?
Shock or impact of a heavy falling object
What are three reoccurring factors that lead to floor collapse., ?
Vacant buildings
Renovated buildings
Overloading
When is the most dangerous time for floor collapse?
The decay stage, after fire has been extinguished
What is more dangerous to firefighters? A bowstring truss roof without a ceiling, or with a ceiling?
With a ceiling
Can you attempt to extinguish a fire in the truss loft of a bowstring truss if it has a ceiling below?
No. Exterior attack only
