CHAPTER 12

Question 0

The bottom chord of the truss is under

Answer 0

Tension

Question 1

The top chord of the truss is under

Answer 1

Compression

Question 2

Trusses can be built of

Answer 2

Wood
Steel
Wood and steel combined
Concrete

Question 3

Wooden truss floor facts

Answer 3

• The truss floor building ordinarily gives no outward indication of its presence
• The void between the floors can act as a reservoir for explosive carbon monoxide
• During a fire their presence may be disclosed by smoke showing through the wall at the floor line. This is less likely in brick veneered buildings
• They are prone to early collapse

Question 4

Steel truss fire facts

Answer 4

• Steel trusses should be cooled by hose streams from a safe location. Do not worry about throwing water through smoke or wetting the contents
• When going into a defensive mode because of potential roof collapse, keep personnel well clear of doors and windows due it the blast of fire that may come out when the roof collapses