Steel Erection Flashcards
What is another term for open web steel joists?
H Spans
The long span joists are a part of which series?
LH-series
All joists consist of the following basic elements?
Top chord, bottom chord, web members, and bearing seats.
The most common type of chord is:
Back to back angles
Joist members are always connected by
Welding
Spans for open web steel joists range from:
8-60 feet
Length range for long span joists is:
21-96 feet
Depth range for long span joists is:
18-48 inches
Deep long span joists have a maximum depth of:
72 inches
Beating depth for deep long span joists, chord number 18 is:
7 1/2 inches
What is the load rating of a joist girder with designation 36G9N6K?
6 kips at each joist location, unfactored.
What joist shipping position is particularly vulnerable to damage during unloading/handling?
Flat
The maximum weight of bridging bundles as required by OSHA cannot exceed:
1000 pounds
Joist girders must bear a minimum of how many inches on steel supports?
4
The minimum welded end anchorage for joist girders must be:
Two 1/4 inch fillet welds 2 inches long
The type and quantity of bridging required to maintain stability during erection is defined in
The Steel Joist Institutes Standard Load Tables
The final attachment of joist ends can be made by
Bolting or welding
The purpose of bridging is:
To brace the joists against lateral movement during erection and placing of construction loads
Which joists should be bridged first?
The one nearest the end of the building.
Bridging should be attached by
Welding or bolting
Longspan and deep longspan joists bearing on concrete or masonry supports must bear on:
Steel plates, anchored to the masonry unit for a minimum distance of 6 inches
For spans over 60 feet, bridging connections may be:
Bolted only
Which joists should be bridged first?
The one nearest the end of the building.
For horizontal bridging, the minimum drop is:
3 feet
Joist camber is in what direction?
Up at the center of the joist.
Areas of the decking that buckle during concrete pour:
Do not adversely affect the live load capacity
Do not field cut deck at holes/openings until concrete has reached:
75% of the design strength.
Sheet to sheet connections may be made by:
Self drilling screws and welds
All welding should be done in accordance with
The Structural Welding Code, AWS D1.1 or D1.3
Shear studs should be installed:
After the platform is attached to the structure.
The “Tag End” location of the joist can be found
On the Joist Placement Plans
When is erection bridging to be installed?
As the joists are erected and before the hoisting cables are released.
How many employees are allowed on a short span joist before bridging is installed and anchored?
One
How many employees are allowed on a long span joist before bridging is installed and anchored?
2
The vast majority of bridging is:
Welded, horizontal type
The purpose of bridging is to:
Prevent joists from collapsing under load
The most common bridging material is:
Angle
What type of bridging is required for joists of 60-100 foot length?
Bolted diagonal
In assembling multi-piece joists, the erector must
Match mates
The steel bearing plate must be how wide?
Not less than 6 inches
The joists must bear how far on the beating plate?
Minimum 2 1/2 inches
Horizontal bridging shall be capable of resisting a nominal horizontal force of not less than
700 lbs
Joists shall be spaced
So that the loading on each joist does not exceed the design load
Floor and roof decks may consist of
Wood and gypsum
Cast in place slabs shall be not less than what thickness?
2 inches
How far shall the ends of joist girders extend over masonry or concrete supports?
Not less than 6 inches
The steel bearing plate for supporting joist girders on masonry or concrete shall be how wide?
Not less than 9 inches
