logbook week 4
DESCRIPTION
Zoe BrainTRANSCRIPT
• Week 4: Concrete, steel framing and 6mber systems.
• During our lecture in week 4 we looked at the Pavilion
building and the individual roles of the people crea6ng this structure. In tutorial we looked at the use of scale in architectural plans. It is clear that the appropriate scale really depends on the individual project and whether or not you’re looking up close or from afar at the structure in the plan. However, 1:100 is generally a good scale to use. Building and plan size also need to be taken into considera6on when deciding on scale.
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• Steel framing: • Gauge steel framing-‐ Melbourne school of design. • Girders (main beam) • Steel framing is some6mes combined with concrete slab systems-‐
generally when shallow floor systems are desired.
• Timber systems: • Used in the Oval Pavilion. • Tradi6onally use a combina6on of bearers (primary beams) and
joists (secondary beams).The spacing of the bearers equals the span of the joists.
• Concrete: • 1 part Cement: Portland and lime • 2 parts Fine aggregate: sand • 4 parts Coarse aggregate: crushed rock • 0.4-‐0.5 parts Water
• When cement powder and water are mixed a chemical reac6on takes place and heat is realeased-‐ this process is called hydra6on. If too much water then it will be weak is not enough unworkable.
• Formwork= the temporary support or moulds used to hold the liquid concrete in place before it hardens-‐ made from 6mber, metal, plas6c, form ply etc. and can be sacrificial (stay in place); otherwise is reused.
• Formwork is supported by props and bracing during the curing (hardening) process.
• 75% compressive strength is reached in 7 days but tested over 28 days.
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• The sketch ** shows the different finishes for concrete from board-‐marked where the formwork was a very textured wood, to exposed aggregate where the concrete has been grinded down and then polished.
• Concrete is very strong in compression but weak in tension. Steel (strong in tension)is used as reinforcement.
• Concrete is permeable (not completely waterproof) thus the steel reinforcement could become oxidised if it’s too close to the surface.
• Concrete needs to be vibrated also to get rid of air bubbles. • Control joints absorb expansions and contrac6ons. • Construc6on joints divide the construc6on into smaller parts. • Control and construc6on joints are poten6al weak points and it is necessary
that moisture is controlled by means of appropriate detailing. • Romans invented concrete however they laid a wall as opposed to pouring
one. • Concrete use is demonstrated in the pantheon where the dome was
constructed of several different types of concretes, specifying that the lightest aggregate concretes were situated at the top of the dome.
• PRECAST CONCRETE: Cheaper; get specific finish/look/use things from a specific area (not close);higher quality; concrete reacts differently according to the weather/temperature; faster-‐easier in factory (repe66ve-‐use mould). Rarely used in foo6ngs.
• INSITU CONCRETE: if too big to transport. • WHICH HAS BEEN USED IN THE MELBOURNE SCHOOL OF DESIGN FLOOR
SYSTEM?: sacrificial metal framework-‐(blue roofing material on top; it’s sacrificial because you leave it there/temporary support) and concrete in situ beams-‐(concrete poured on site)
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• References: • hlps://issuu.com/envs10003/docs/week_05/2?
e=8943534/7327804 • hlp://www.youtube.com/watch?
v=otKffehOWaw&feature=youtu.be • hlp://www.youtube.com/watch?
v=c1M19C25MLU&feature=youtu.be • hlps://app.lms.unimelb.edu.au/bbcswebdav/courses/
ENVS10003_2014_SM1/WEEK%2004/BEAMS%20AND%20CANTILEVERS.pdf
• hlp://www.youtube.com/watch?v=c3zW_TBGjfE&feature=youtu.be
• hlp://www.youtube.com/watch?v=9aL6EJaLXFY&feature=youtu.be • hlp://www.youtube.com/watch?v=scYY-‐
MMezI0&feature=youtu.be
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