Steel Joists and Girders Flashcards
How do you read an open web steel joist designation such as 18K7?
18 - denotes the nominal joist depth in inches
K - is the joist series
7 - is the chord number designation
What is the standard bearing depth of a open web steel joist, k-series?
2-1/2”
What is the standard bearing depth of a long span joist, LH-series?
5”
What is the standard bearing depth of a joist girder?
7-1/2”
What is the size of a joist girder vertical stabilizing plate located at the bottom chord?
A minimum of 6 inches by 6 inches and must extend at least 3 inches below the bottom chord of the joist girder.
Joist Girders must bear on steel and or a steel plate resting on concrete. What is the minimum bearing length for each?
4” on Steel
6” on Steel Plates supported on Concrete/Masonry
What is the minimum end anchorage attachment for joist girders?
(2) 1/4” x 2” long fillet welds OR
(2) 3/4” Dia. Bolts
For steel joists, when uplift forces are a design consideration, a row of bottom chord bridging is required near each _____ of the steel joists.
End
The weight of a bundle of angle iron (bridging) shall not exceed a total of _____ pounds.
1,000
What is the approximate camber for a 100 foot longspan joist?
4-1/4”
The edge of a bundle of angle iron (bridging) shall be placed within _____ foot/feet of the secured end of steel joists.
1’
For long span steel joist 70 feet long, hoisting cables shall not be released until bolted diagonal bridging has been installed ______.
Two lines nearest the third points
A Steel Joist Girder has a designation of 40G10N8K. The “10N” means?
Is the chord number designation
Load joists into an open top trailer in an _______ position for delivery.
Upside Down
A steel joist end is resting on a steel support. The steel joist must bear a minimum of 4 inches at seat depths greater than ______.
5” inches or greater
