Week 04 Summary
Span and Spacing
Concrete 1 cement(Portland lime)+ 2 fine aggregate(sand) + 4 coarse aggregate(crushed rock) + 0.4-0.5 water Too much water – weak concrete Too little water – unworkable concrete Span – the vertical/horizontal distance between 2 structural supports. Spacing – the repeating vertical/horizontal distance between a series of like/similar elements.
Floor & Framing System Concrete •Slab of various types that can span one way or two ways and spans between the structural supports. •The thickness of the slab is determined by the span divided by 30.
Timber •Combinations of bearers (primary beam) and joist (secondary beam) •Span of the bearers – the position of the stumps and the spacing o the bearers.
IN SITU Concrete
Steel •Main beams = girders •Heavy gauge structural steel / light gauge steel framing. •Steel framing can be combined with concrete slabs. • Spanning capability of the material helps to determine the spacing of the supports.
PRE-CAST Concrete
DESCRIPTION
Any concrete that’s been poured into Any concrete that’s been fabricated framework and cured on the site. in a controlled environment, thwn transported to site for installation.
PROCESS
Fabrication&assembly of the formwork - pouring,vibration,curing
Fabrication - Transportation
USES
•Footing •Retaining walls •Non-standard structural elements. •Sprayed - swinming pools and landscpae. •Bespoke •Once poured, limited time •Labour intensive
•Stucture of a building •Bridge or civil works •Panel elements •Retaining walls •Columns
CHARACTER ISTICS JOINTS
•More standardised, Faster •High level of quality •Limited in size by transport •Construction joint – smaller and •Construction joint – one precast more mageable element meets another. •Control joint – absorb the •Structural joint – precast of the expansions and contractions, strcuture. movement is controlled. JOINTS CAN GREATLY DEPEND Both-POTENTIAL WEAK POINTS. ON DESIRED AESTHETICS.