steel Flashcards
These shapes are produced in different sizes and are designated with the letters _______.
W, HP, M, S, C, MC, L
___ shapes are doubly symmetric wide-flange shapes whose flanges are substantially parallel.
W
_____ shapes are also wide-flange shapes whose flanges and webs are of the same nominal thickness and whose depth and width are essentially the same.
HP
The ____ shapes are doubly symmetric shapes whose inside flange surfaces have approximately 16.67% slope.
S
The ____ shapes are doubly symmetric shapes that cannot be classified as W, S, or HP shapes.
M
_____ shapes are channels with inside flange surfaces having a slope of approximately 16.67%.
C
_____ shapes are channels that cannot be classified as C shapes.
MC
______ shapes are angle shapes with either equal or unequal legs.
L
In addition to these shapes, other structural sections are available, such as, ______
tee, sheet piling, rail
The letter indicates the _____, while the two numbers indicate the ______ and the ______.
shape, nominal depth, weight per linear unit length
An _____ shape is designated with the letter L, followed by three numbers that indicate the leg dimensions and thickness in inches.
angle
Dimensions of these structural shapes are controlled by ASTM _____.
A6/A6M
____ shapes are commonly used as beams or girders.
W
_____ can also be formed by welding different shapes to use in various structural applications.
composite sections
______ sections are connected to each other and are used as retaining walls.
sheet piling
Since concrete has negligible tensile strength, structural concrete members subjected to tensile and flexural stresses must be _____.
reinforced
In _____, the stresses fluctuate with loads on the structure. This does not place any special requirements on the steel.
conventional reinforcing
In _______, the steel is under continuous tension.
prestressed reinforcement
Any stress relaxation will ______ the effectiveness of the reinforcement.
reduce
Reinforcing steel (rebar) is manufactured in three forms: _______.
plain bars, deformed bars, plain and deformed wire fabrics
_____ are round, without surface deformations.
plain bars
_____ provide only limited bond with the concrete and therefore are not typically used in sections subjected to tension or bending.
plain bars
_____ have protrusions (deformations) at the surface, thus, they ensure a good bond between the bar and the concrete.
deformed bars
The ____ of the bar prevents slipping, allowing the concrete and steel to work as one unit.
deformed surface
_____ are flat sheets in which wires pass each other at right angles, and one set of elements is parallel to the fabric axis.
wire fabrics
_____ develop the anchorage in concrete at the welded intersections
plain wire fabrics
______ develop anchorage through deformations and at the welded intersections.
deformed wire fabrics
______ are used in concrete beams, slabs, columns, walls, footings, pavements, and other concrete structures, as well as in masonry construction.
deformed bars
_____ are used in some concrete slabs and pavements, mostly to resist temperature and shrinkage stresses.
welded wire fabrics
_____ can be more economical to place and this allow for closer spacing of bars than is practical with individual bars.
welded wire fabrics
Bars are made of four types of steel: _______.
A615 (billet), A616 (rail), A617 (axle), A706 (low-alloy)
_____ is the most widely used.
A615 billet
____ steel is often used when the rebar must be welded to structural steel.
A706 low-alloy
Reinforcing steel is produced in _____ grades.
four
To permit ready identification of the different bar types in the field, there are four marking symbols: ______
- letter code for manufacturer
- numerical code for bar size
- letter code for type of steel
- grade of steel designated by either grade lines or numerical coded
Grade 40 or 300
no designation
Grade 60 or 420
one grade line between the main ribs or the number 4
Grade 75 or 520
two grade lines between the main ribs or the number 5
_____ requires special wires, cables, and bars.
prestressed concrete
Steel for prestressed concrete reinforcement must have ____ strength and ____ relaxation properties.
high, low