Upload
achini-attanayake
View
215
Download
1
Tags:
Embed Size (px)
DESCRIPTION
Logbook Interim Submission Constructing Environments University of Melbourne
Citation preview
Applied force
Figure 2: Original Plan
In the tute, the aim was to build the tallest structure
using MDF blocks. We also had to accommodate
sufficient room for a toy horse.
Our original plan was to have a large square
foundation, with tall walls built on the sides. At one
end, there was to be a small rectangular opening for
the toy horse. The ceiling of the structure was to be
resolved later during the process.
We used two methods of brick arrangement for the
foundation.
Opening for horse
View from
above
Figure 3: Brick arrangement No. 1.
Note: Compression is in action
Figure 4: Brick arrangement No. 2
The MDF blocks whilst sturdy and suitable for
compressive loads, lacked a frictional surface.
Hence, despite the blocks’ neat appearance, we
struggle to keep the arrangement in a tidy manner.
Figure 5: Brick arrangement No. 1 (Picture: Achini Attanayake)
Figure 7: The placement of the walls
Note: Arrows show load paths
The original size of the foundation was approximately
19×19 blocks. However, we reconsidered its size as there
was a limited timeframe as well as a restricted supply of
resources. The altered sized was approximately 10×10
blocks.
View from above
Original foundation
Reaction force
Figure 6: Altered foundation (Picture: Achini Attanayake)
Figure 1: Models constructed to support
a brick
During our first week, we were introduced to the
concept of compression. We made paper structures
which would be able to support a brick.
Most of the successful models were short and stout in
nature.
WEEK 1: COMPRESSION
1
Figure 8: Finished model due to lack of time
(Picture: Achini Attanayake)
Figure 10: Deconstruction of the model
Note: Arrows show the load paths
During the deconstruction process, each side
collapsed after around 3-4 blocks were removed.
The others also opted to place their blocks in the same
arrangement (See Figure 3). However, some groups
placed blocks on its side in order to increase height at a
faster rate.
This group closed off the ceiling by gradually
decreasing the size of the surrounding circles.
Unlike us, all of them preferred circular bases.
Figure 12: Another group’s model
(Picture: Achini Attanayake)
Figure 13: The winning model
(Picture: Achini Attanayake)
Figure 9: Deconstruction of the model
(Picture: Achini Attanayake)
Figure 11: Alternative brick arrangement
Note: Arrows show the load paths
2
WEEK 2: FRAME
The aim was to build a high structure using
thin long pieces of balsa wood.
We incorrectly cut the wood into shorter
pieces.
Figure 15: The base (Picture: Achini Attanayake)
Fixed joint
This was to be a structural skeletal system.
Therefore, we tried to employ certain aspects
like lateral bracing.
However, the wood pieces proved to be too
short to provide bracing between the sides.
Figure 18: Construction of the sides (Picture: Achini Attanayake)
Adding another triangular formation proved to
be sufficient support.
Figure 14: Models
During the lecture, we were taught the importance
of certain framing techniques. As seen in Figure 14,
diagonal structures are more stable and stronger
than vertical members.
We tried applying this technique when constructing
our tower.
Figure 16: Fixed joint (Newton, 2014)
Figure 17: Lateral bracing
5
Figure 19: Construction of the sides (Picture: Achini Attanayake)
We added a supporting leg on the
side to prevent structure from toppling
over.
We increased its height by sticking wood
pieces together. We also added triangular
formations to keep the sides in place.
The balsa was too soft and hence, it kept
snapping on occasions. The sticky tape
was an unreliable source of binding
material as its stickiness wore off. Glue
took too long to work effectively.
Figure 20: Finished model (Picture: Achini Attanayake)
Figure 22: Stressing process (Picture: Achini Attanayake)
Stress point
When put under stress, our structure took a while
to break. This was due to the short pieces of
wood which provided more sturdiness than
longer pieces.
Figure 21: Load paths in
finished model
Figure 23: Load paths in model while under stress
Point load
6
Others also utilised triangular formations in their structures.
Figure 24: This group used lateral bracing and hence, their
structure was very stable.
Figure 25: The winning structure used the same approach as
us but it collapsed easily due to the longer pieces.
Figure 24 (on left) and Figure 25 (on right): Other models
(Pictures: Achini Attanayake)
8 7
GLOSSARY
BEAM: a rigid structural piece which carries and transfers transverse loads to supporting members (Ching, 2008)
BRACING: a structure, usually diagonal, which supports adjacent framework
COLUMN: a vertical and cylindrical structure which usually upholds a horizontal member above
COMPRESSION: when an external load pushes on a member, the particles within the material are condensed together
(Newton, 2014)
DEAD LOADS: a static load which acts vertically downwards on a structure; it is the self-weight of the structure itself
(Ching, 2008)
ESD: Environmentally Sustainable Design; the efficiency of a building’s design along its lifespan (Newton, 2014)
FORCE: any influence which produces a change in the shape or movement of an object (Newton, 2014)
FRAME: also known as skeletal systems; efficiently transfers loads down to the ground (Newton, 2014)
LIVE LOADS: moving or movable loads (Ching, 2008)
9
LOAD PATH: the most direct path taken by applied loads (Newton, 2014)
MASONRY: stonework
POINT LOAD: a load located at one point
REACTION FORCE: an equal and opposite force to an applied action
STABILITY: the ability to sustain any possible load conditions (Ching, 2008)
STRUCTURAL JOINT: a method of connection between structural members
STRUCTURAL SYSTEM: a particular system which supports, and transmits gravity and lateral loads to the ground (Ching,
2008)
TENSION: when an external load pulls on a member, the particles within the material are pulled apart (Newton, 2014)
UNIFORM LOAD: loads that are distributed equally along a plane
VECTOR: a quantity with a magnitude and a direction (Newton, 2014)
10
REFERENCES
Ching, F.D.K. (2008). Building construction illustrated (4th ed.). Hoboken, New Jersey: John Wiley & Sons
Grose, M. (2014). Walking the constructed city. Retrieved from
http://www.youtube.com/watch?v=CGMA71_3H6o&feature=youtu.be
Newton, C. (2014). Construction systems. Retrieved from
http://www.youtube.com/watch?v=8zTarEeGXOo&feature=youtu.be
Newton, C. (2014). ESD and collecting materials. Retrieved from
http://www.youtube.com/watch?v=luxirHHxjIY&feature=youtu.be
Newton, C. (2014). Introduction to materials. Retrieved from
http://www.youtube.com/watch?v=s4CJ8o_lJbg&feature=youtu.be
Newton, C. (2014). Load path diagrams. Retrieved from
http://www.youtube.com/watch?v=y__V15j3IX4&feature=youtu.be
Newton, C. (2014). Structural joints. Retrieved from http://www.youtube.com/watch?v=kxRdY0jSoJo&feature=youtu.be
Newton, C. (2014). Structural systems. Retrieved from http://www.youtube.com/watch?v=l--JtPpI8uw&feature=youtu.be
Selenitsch, A. (2014). Column and Wall; Point and Plane. Retrieved from
http://www.youtube.com/watch?v=KJ97Whk1kGU&feature=youtu.be
11