Ch.9 Flashcards
Primary two metals alloyed in steel are?
Iron and carbon
Common structural steel has less than ____ of one percent carbon?
3/10ths
Cast iron has a carbon content of __ to __ percent ?
3 to 4 %
The rolling process consists of repeatedly passing ingots of steel heated to _______ degrees between large rollers until the intended shape is archived?
2,200 degrees F
Common structural steel which contains manganese ,carbon and silicon ?
ASTM A36
Yield point stress is reached on A36 steel at _________psi?
36,000 psi
Steel alloys with higher yield points have less _________?
Ductility
Unrestrained steel beam that is 20 feet long can expand ____ inches when heated ,significantly pushing at lateral constraints?
1.4 inches
Steel is a good conductor of heat because it is a heavy material , having a density of around ____ pounds per cubic feet?
490
A steel column encased in ___ inches of concrete with a siliceous aggregate would have a fire resistance of ___ hours?
3 inches
4 hours
The most commonly used SFRMs are mineral fiber or expanded aggregate coatings such as ____________ and ________?
Vermiculite
Perlite
The applied fireproofing for SRFM can vary from 7/8ths to 1 7/8ths to produce a fire resistant rating of ___ to ___ hours?
1-4 hours
Asbestos has not been used in SRFMs since the ________?
1970s
Cementitious materials have density ranging from ___ to ___ lbs /ft?
15 to 50
Gypsum includes approximately ___ percent of entrapped water?
20 %
Process of driving free and chemically bound water out of gypsum?
Calcination
______________ undergo a chemical reaction when exposed to the heat of a fire ?
Intumescent materials
An intumescent coating will char , foam and expand when heated , the coating material will expand to ___ to ___ times its original volume?
15 to 30
Intumescent coatings are applied as paint , they have an applied thickness of ___ to ___ inches which is less than the thickness of the spray applied materials?
0.03 to 0.4 inches
A common used method of protecting a steel floor or roof assembly is the __________________?
Membrane ceiling
Beam and girder steel frames can be classified as _____, _______, or _____________?
Rigid
Simple
Or semi rigid
In simple frames the joists are designed primarily to support a _________ force?
Vertical
________ trusses provide a structural member that can carry loads across greater spans more economically than beams can?
Steel
Steel trusses are frequently used in three dimensional space frames in which case they are known as ________?
Delta trusses
Two commonly encountered applications of the basic steel truss are the _________ and the ___________?
Joist girder
Open web joist
_____________ are mass produced and are available with depths of up to 6feet and span 144 feet?
Open web joists
When round bars are used for the diagonal members , the open web truss is known as a ________?
Bar joist
Steel rigid frames usually are used for spans from ____ to ____ feet and are fabricated by welding or bolting together steel shapes and plates ?
40 to 200 feet
The top of the rigid frame is known as the _______ and the points where the inclined members intersect the vertical members are known as the _____?
Crown
Knees
Steel arches can be constructed to span distances in excess of ______ feet?
300 feet
Wire for use in bridge cables can have strengths as high as ___________ psi ?
300,000 psi
Columns used for structural support in buildings should not have a slenderness ratio greater than ____?
120
Open web joist floor design in steel frame buildings uses a lightweight concrete with a minimum thickness of ___ inches supported by corrugated steel decking ?
2 inches
Light gauge steel joists are produced with depths of ____ to ____ inches and can be spaced 16 to 48 inches apart depending on the span and the load to be supported?
6 to 12 inches
The primary purpose of a ____________ is to strengthen the connection and increase the steel mass at the connection decreasing the possibility of failure?
Gusset plates
