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Flashcards in 9 Steel Construction Deck (51)
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1

Basic properties of steel

Strongest building material
Non rotting, resistant to aging, dimensionally stable
Consistent
Relatively expensive but strength and variety allows for less quantity to be used

2

Ductile

Capable of being bent shaped or drawn out

3

Lower carbon content of steel compared to iron allows it to

Be shaped due to it being less brittle and more ductile

4

Cold rolled steel is used for members that

Have a thin cross section, such as floor decking and wall studs

5

Two disadvantages of steel

Rusts
Loses strength when heated by fire

6

At 1200 degrees f steel loses what percent of strength

Appx 72%

7

Amount of expansion when heated for slender steel members such as columns and beams, can be determined by a property known as

The linear coefficient of thermal expansion

8

Linear coefficient of thermal expansion, unrestrained steel beam 20' long is heated from 70 to 1000 degrees uniformly, it would expand

1.4 inches, if restrained it would expand less

9

Heating of steel members is not uniform in fires, therefor the expansion is

Not uniform

10

Cast iron fronts were used in old buildings cast iron cracks from impact load rather than yielding like steel. It's concerning because

A crack could cause collapse of cast iron building front

11

Steel Beams and columns are connected on two ways

Welding or bolting, riveting was once used but not practical any more.

12

Beam and girder steel frames can be classified as

Rigid, simple, or semi rigid.

13

Rigid frame steel building

Connections between beams and columns designed to resist bending forces from load and lateral force

14

Girder

Large horizontal member used to support joists and beams at isolated points along their length

15

Simple steel frame

Joints designed primarily to support vertical force. Beams and trusses frequently supports by masonry

16

Semi rigid

Possess enough rigidity to provide some diagonal support. May use sheer walls or diagonal bracing

17

Steel trusses provide a structural member that can carry loads

Across a greater distance than beams

18

In three dimensional space frames, steel stresses are known as

Delta trusses because they resemble the triangular Greek delta

19

Two common applications of basic trusses

Open web joist and joist girder

20

Bar joist

Open web truss entirely of steel with steel bars as web members

21

Open web joists are available on what range of size

Depth up to 6 ft and span up to 144', more frequently depth of less than 2' and span of 40'

22

Steel rigid frame building with gabled roof is widely used for

One story industrial, farm buildings spanning 40-00 ft

23

Steel arches are used for large unobstructed interior flor space requirements spanning in excess of

300 ft

24

Girder arch

Solid arch built from angles and webs

25

Trusses arch

two halves of the arch are made of trusses and are pinned in the middle

26

Slenderness of steel members can cause what when used as columns

Bucking and is a function of the length of the column

27

Columns for structural support should not have a slenderness ratio greater than

120

28

Three methods of supporting floors in steel buildings

Open web joist (bar joist) or trusses
Steel beams
Light gauge steel joists

29

Open web joists are commonly used to support floors of

Concrete minimum 2" over metal deck, supported by steel beams or masonry walls at ends

30

Steel joists are produced with depths of, and can be spaced up to

Depth of 6-12" and spaced 16-48" apart