Ch 11 Lightweight Wood Truss Collapse Flashcards
There are two types of wood truss systems used in building construction? Pg 156
Heavy timber truss systems and lightweight wood truss systems.
Lightweight trussed rafters may be expected to collapse after how long? Pg 156
10 minutes
The main concern of the fire service is what? Pg 157
Sheet metal surface fastener used to connect the truss members together.
The metal surface fastener only fastens the outer how many inches of the surface of the truss? Pg 158
1/2 inch
After what amount of time exposed to a fully developed fire can lightweight trussed rafters be expected to fail?
p. 156
10 minutes
Which buildings do laws requiring markings indicating a truss construction generally apply to? p. 160
Commercial only
What shape is the nailing fastener?
p. 158
V
What direction will fire spread be impeded by the solid wood beam construction? p. 159
Perpendicular to the beam
Where is the critical area subject to failure in any structural element? p. 158
Connection
How much faster will fire spread be in a building’s concealed space than in concealed spaces of a building
with conventional solid wood beam construction? p. 160
100 percent
What is used to connect the heavy timber truss members? p. 156
Steel bolts and plates
How much of the wood truss member is connected by the surface fastener?
p. 157
1/2 inch (1.2 cm)
Which problem will arise when the lightweight wood truss is not stored properly? p. 158
Loosening of the connectors
What is the main concern of the fire service with the lightweight wood truss? p. 157
Sheet metal surface fastener
