Lecture 16 Flashcards
Connections
Transitional elements, such as steel angles, or plates. May be riveted, but are often bolted or welded
Moment Conncection
Transfers gravity loads and bending forces, beam flanges are joined to column, column is reinforced, beam is restrained.
Framed Connection
Angles, plates, or tees connect web of beam to side of column. Angles are joined to beam in shop. Beam/angle is bolted on field
Shear Connection
Transfers gravitiy loads from beam to columns. Not sufficently rigid to transfer bending forces. Modeled sturcturally as if it is free to rotate or hinged.
Bolted column or splice
Splices typically located at roughtly waist height, to avoid interference with beam-column connections at floor and so that column splices are conviently accessible to workers.
What happens when outer dimensions of connected column sections vary?
Shims or filler plates are inserted to make up the difference
What happens when inner dimensions of spliced columns differ?
A butt plate or bearing plate is added to the connection. Transfers loads from the upper column section to the lower one.
As the frame is erected what happens?
Turnbuckles are used to plumb up (make vertical) the frame
Decking
Corrugated steel laid over the framing is the most common floor and roof material. Puddle welded to members
Why can steel decking bond more?
Because of deformations and the structural bond between deck and concrete poured over it.
Fireproofing
Insulation to protect steel from the heat of fire
Spray-On Fire Protection
To achieve an equal level of protection, lighter memebers require more instulation that heavier ones. Only floor beams.
Advantages of steel structures
Bring to site whenever you need. No need to be sored in site. Highly finished. Longer spans and flexible. Lighter than concrete frames. Expended and reused. Recycable.
