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20 Cards in this Set
- Front
- Back
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Beams, girders and columns of steel framed buildings are erected by crane operator plus _____ members of the bolt-up gang.
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2
[Except I think it's the raising gang, not the bolt-up gang] |
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Corrugated sheet welded to a flat sheet with voids for running electrical and telecom cables is __________________
decking. |
Cellular
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Concrete poured over metal decking with deformed ribs is an example of composite decking.
TRUE or FALSE |
True
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________________ decking is poorly compatible with steel framing.
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Cellular
[I think the answer is site cast concrete - I sent him an email on this one] |
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Like arches, rigid frames feature horizontal "outward __________" at the base of the columns that is offset by using steel cables embedded into the foundation between the columns.
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thrust
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What are the responsibilities of the steel frame fabricator?
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- Produce framing plan.
- Produce accurate members with correct bolt holes and connectors. - Code and order all pieces for delivery. |
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What are the two gangs of ironworkers?
What are their jobs? |
Raising gang - Use tapered drift pin to pin frame together, then add a few temporary bolts.
Bolt-up gang - follows to install bolts, plumb the structure, and finally tighten bolts fully. |
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What are two methods for attaching columns to the foundation in the first tier?
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1. Column with base plate is set on anchor bolts coming up from foundation with leveling nuts to plumb the column. Then grout under base plate.
2. Place thin leveling plates on grout for one-shot chance at leveling. Set column on plate and anchor with bolts. |
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What are steps in erecting the each tier?
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1. Install columns or splice columns to previous tier.
2. Install beams and griders. Plumb up. 2. Tighten connections, weld if req'd, install bracing, grout columns if first tier. 3. Install perm decking, temp decking, or safety nets. |
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What are two types of tower cranes?
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Hammerhead boom and lufting boom
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The spanning capacity of metal decking is a function of what 3 things?
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Thickness of sheet
Depth of corrugations Spacing of corrugations (ribs) |
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How is cellular decking made?
What is the side benefit of it? What can it be used for? |
Corrugated decking welded to flat plate.
The voids create space for running electric and telecom cables. Can be strong enough to use as floor deck without concrete. |
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What are the 2 uses for single sheet decking?
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Roof decks
Form for concrete deck |
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1. How is concrete bonded to metal decking?
2. How is decking connected to frame? 3. Why? |
1. Either deformed ribs in decking, or shear studs (puddle welded to decking and beam).
2. Puddle welds, self-tapping screws, pins driven in. 3. Transfer load from floor to frame. Floor acts as diaphragm to add rigidity. |
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How do the materials act together in composite decking?
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Concrete provides compressive strength.
Steel decking provides tensile strength. Strong and economic! |
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What are 3 advantages of pre-cast concrete?
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Light weight.
Quick to install. Can be installed in weather not conducive to pouring concrete. BUT - usually requires thin poured concrete layer for smooth finish. |
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What is preferred type of fireproofing for columns? Beams and girders?
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Spray on for columns.
Spray on for beams and girders if hidden above ceiling tiles (common) New: intumescent coating, like paint. Expands and chars with heat. For low to medium fire risk. |
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What is castellated beam?
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Wide flange beam with holes cut out of web. Increases depth (capacity) and decreases weight.
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What is plate girder? Used for?
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Custom made girder, made from plate and angles, can be beefed up for special loading requirements - specifically where forces require strengthening, can accommodate custom openings.
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Describe the most common type of composite column.
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Pipe column.
Pipe filled with steel-reinforced concrete. Pipe carries load and serves as form for concrete. |
