Chapter 10 Flashcards
Fire resistive, in contrast to noncombustible construction, is permitted to be of ___ height.
Unlimited
Many non combustable building are ___ stories in height, with the max being ___ stories for certain types of occupancies.
1-3 stories
12 stories
Noncombustible construction relies heavily on the use of ___ for its structural system.
Steel
The use of ___ in Type 2 construction is typically limited to the exterior walls and shaft enclosures.
Concrete
The modulus of elasticity of steel is ___.
29 million psi
Steel’s compressive strength is equal to its ___ strength.
Tensile
Steel’s shear strength is about ___ of its tensile strength.
3/4
Cold drawn steel, such as steel tendons used for tensioned concrete and for exaction tie backs and elevator cables, will fail at about ___.
800°F
The variety of steel shapes available has led to a specific nomenclature for specifying structural steel members. The following abbreviations are used: C: CB: L: S: W: WT:
C: channels CB: castellated beams L: angles S: America Standard (I-beams) W: wide flange beams and columns WT: structural tees
Structural steel uses the shape abbreviation and a set of two numbers on architectural blue prints. The first number refers to the ___ of the member in inches, while the second number refers to the weight of the member ___.
Depth
Per foot of length in pounds
Steel angles use three numbers to to identify the the steel member on blueprints. The first two refer to the ___ of the two “legs”, while the last number refers to the ___ of the legs.
Nominal depths
Thickness
Rigid frames can provide clear spans of about ___ feet.
100 feet
___ is used where an explosion is a possibility.
Friable construction
Aluminum melts around ___.
1,200°F
Steel will expand ___ to ___ % in length for each 100°F rise in temperature.
0.06 to 0.07%
Heated to 1,000°F, a steel member will expand ___ inches over 100 feet of length.
9 1/2”
A steel column will fail when a temperature of ___ is exceeded at one point or ___ is exceeded on the average in the column.
1,200°F
1,000°F
In some building codes, steel used to support roofs at a certain distance above the floor (usually ___ to ___ feet) does not require protection.
20 to 30
Steel does not require protection in atria roofs over ___ feet above the floor.
55
4 types of protection for steel structures. 1. 2. 3. 4.
Unprotected
Dynamically protected
Passively protected
Passive/dynamic combination protection
A 2 1/2” hose line can easily throw a horizontal stream more than ___ feet.
80 feet
Steel fire escapes must be certified every ___ per code.
5 years
