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14 Cards in this Set
- Front
- Back
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In casting a site cast concrete wall, ______ ______ penetrate through the formwork and prevent the forms from bursting outwards or collapsing inwards.
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Form ties
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What are used to spread the load from the ties across formwork?
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Walers (horizontal beams)
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What are the steps for casting a concrete wall?
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1. Base is a wall or strip footing with dowels up from foundation, with key or groove in footing.
2. Tie horizontal and vertical rebar to dowels. 1 or 2 layers of rebar for reinforcement. 3. Install forms, with form ties and walers. 4. Pour concrete. |
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Concrete slabs used for floor and roof slabs, spanning across parallel beams, and reinforced with rebar in one direction and temperature steel in the other are called _________________.
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One-way slabs
(Steel slabs and pre-cast concrete are one-way slabs.) |
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Site-cast concrete slabs that are reinforced equally in both axes are called _________ slabs.
What's the advantage over one-way slabs? |
Two-way slabs
Less rebar + shallower = less cost |
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A hybrid type of one-way slab is _________________ slab.
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banded
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______________ _____________ or ___________ slab is a one-way framing system for longer spans, with widened endings to resist shear forces. Some of the concrete is hollowed out to reduce dead load.
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Concrete joists or ribbed slab
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1. The slabs in modern two-way framing systems is called ________ __________.
2. Why it this used in hotels and multi-family (not in seismic areas)? 3. Does this require thickening or drop panel at columns? |
1. flat plate
2. Provides minimum floor-to-floor space w/o sacrificing ceiling height 3. No |
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A two-way system similar to ribbed slab is ___________ slab.
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waffle
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As a method for strengthening the slab to column connection, the waffle slab features ___________, that form the same purpose as drop panels in flat slabs.
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heads
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What are the steps for pouring a site-cast system?
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1. Pour walls and columns.
2. Install forms for slab and beams, supported by temp metal or wood beams and adjustable shores or scaffolding. 3. Pour slab and beams. 4. Strip the forms, & reshore beams and slab until they reach full strength. |
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A limitation of one-way structural slabs is that the columns must be placed in square or near-square configurations.
TRUE or FALSE |
FALSE
(True of two-way slabs.) |
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A one-way floor system that attempts to reduce floor-to-floor heights is called a "__________ slab".
Ribbed, solid, banded, flat, waffle, none of these |
None of these
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Arguably the best solution for minimizing the floor-to-floor height of a high-rise building is a two-way flat plate. TRUE or FALSE
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TRUE
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