BC Chapter 9 Flashcards
The basic properties of steel include:
(4)
p. 240
- Strong
- Non-rotting, resitant to aging and dimensionally stable.
- Consistent quality
- Expensive, but strength and other qualities enable it to be used in smaller quantities.
Ways steel can be protected from the formation of rust:
(3)
p. 240
- Paint
- Coat with zinc and aluminum
- Adding alloy elements
Molybendum and vandium add _______ to steel.
p. 240
Strength
Manganese adds ______ to steel.
p. 240
Abrasion resistance
A 20 foot beam can expand ______ inches.
p. 242
1.4 inches
The deterioration of steel strength at elevated temperatures is the characteristic most significant to the fire service.
p. 242
True
Steel’s yeild temperature is ________ degrees.
p. 242
1200 degrees
A Steel column encased in ____ inches of concrete with a siliceous aggregate would have a fire rating of _____ hours.
p. 243
3 inches
4 hours
Coating used to increase the fire resistance of structural components. Materials commonly include mineral fibers or aggregates such as vermiculite and perlite.
p. 243
Spray-Applied Fire Resistive Material (SFRM)
Cementitious materials range from 15 to 50 pounds per cubic foot. Ingredients can include:
(4)
p. 244
- Portland cement
- Gypsum
- Perlite
- Vermiculite
Gypsum boards are available as regular or Type ____ boards.
Type _____ boards are usually required where fire resistance is desired.
p. 244
Type X
Gypsum contains approximately _____% water.
p. 244
20%
A three dimesional steel space frame is also called a:
p. 248
Delta Truss
Open web steel joists are available with depths up to ___ feet and span up to ___ feet.
More frequently they have depths less than ___ feet and spans of ____ feet.
p.249
6 feet & 144 feet
2 feet and 40 feet
The top of a rigid steel frame is known as the _____.
And the points where the inclined members intersect the vertical members are called ______.
p. 249
Crown
Knees
Steel arches can be constructed to span distances in excess of _____ feet.
p. 249
300 feet
Comparison of the height or length of a steel column to its width/thickness.
Used to determine the load that can be supported without buckling.
p. 250
Slenderness ratio
Smaller Slenderness ratios indicate higher stengths.
In general columns for stuctural support should not have a slenderness ratio greater than _____.
p. 250
120
In evaluating a given design, the significance of the slenderness ratio is modified by:
p. 251
the manner in which the ends are attached to the rest of the structure.
Minimum thickness of lightweight concrete on a Open-web Joist floor system:
p. 251
2”
Steel joists are produced with depths of ____ to ___ inches and can be spaced ____ to ____ inches apart.
6 to 12 inches
16 to 48 inches
The following three connection types increas the mass at the point of connection, making them the last item to fail in a structure:
p. 252
- Rigid connection
- Gusset plate
- Knee Joint
