Estimating Principals Flashcards
Units of angular measurement
300 • 42’ 20”
300 degrees 42 minutes 20 seconds
Arc length calculation
N/360 X pie D
Right angle triangles
Pythagorean theorem
Ratio
Trigonometry
3 - 4 - 5 method
Applies to right angle triangles
(Use carpenters square, measure dimensions between four inch mark on the blade and three inch mark on the tongue. This rule can be used to find rafters, cross braces, stairs, ramp stringers and other angular measurements. Used for making square corner or checking square corners.)
SOH CAH TOA
L Shape
Angle iron
W x W x T x L
C Shape / MC
Channel and miscellaneous channel
MC - greater variation of size
CD x Ib/ft x L
D - depth of channel in inches or mm
Z Shape
W x D x W x T x L
D x W x Ib/ft x L
S Shape (S Beam)
Tapered flange
S - Standard S beam shape
SD x Ibs/ft x L
W shape
Like a S Beam but not tapered
W - wide flange beams
HP beam
WWF - wide flange beam
WD x Ibs/ft x L
T shape
Normally made by splitting S shapes and W shapes along the middle depths of their webs.
ST and WT (not tapered)
WTS x Ibs/ft x L
HSS - Hollow Structural Section
Square HSS
Rectangular HSS
Longer side is written first
HSS 8 x 6 x 0.500 x 20
Rectangles and square bar
(Flat bar)
Hot rolled: round corners, mill scale
Cold rolled: sharp corners, clean scale free finish
T x W x L
Thickness x width x length
Round and half round bar
Hot or cold rolled
Round bar
D x L
Half round
T x W x L
Hexagon bar
(6 sides)
F x L
F: distance across flats
