logbook week 1
DESCRIPTION
ÂTRANSCRIPT
Sketch of overlay
It was interesting to see in week 1’s activity: compression, all groups chose to opt for a circular structure with the bricks layered on top of each other in an overlapping pattern. A solid structural system was applied to this activity as it was the most logical use of the material given – wooden bricks. The brick layering method for construction provided with the most stability while a circular shape provided the most efficient use of material. When compared to the square-‐based structure of another group (pictured right), the circular base (pictured left) was just as efficient in providing space for the dog and creating stability while using less blocks, thus freeing material for establishing tower height.
Challenges encountered: -‐ Creating the required opening
for the toy dog to enter the structure
-‐ Creating windows in the structure
-‐ Maintaining stability after reaching a particular height
In the creation of the arch we found that the most efficient method was to add each ‘overlay’ block one at a time, building the structure away from the overlay block to counterbalance the weight of the overlay and the pull of gravity towards the ground. When built from both sides this slowly created the required arch.
W01 Studio activity:
MASS
Photo: other group’s square based structure (Photographer: Jasmin Goldberg)
Photo: our circle based structure (Photographer: Jasmin Goldberg)
Insert load path diagram for arch
As the load path diagram (left) illustrates, the arch didn’t collapse as the force of the dead load of material above the arch was relocated left and right, around the arch to me met by reaction forces through the floor.
The structure was proved to be quite structurally sound in the ‘deconstruction’ phase of the activity as large gaps were made without the collapse of the entire structure. A large number of blocks could be removed (creating additional gaps and arches) before the forces were too strong and the structure collapsed. It was found that other groups in the class were able to remove more blocks due to their initial arrangement of materials being more compact. The greater gaps between blocks (which fulfilled the criteria of using minimal materials) meant that a smaller surface of each material was taking the dead load of the structure, thus making each block more integral to the structures overall stability.
Photo: arch of our structure (Photographer: Jasmin Goldberg)
As the structure grew, we adjusted our structure’s design by “tapering” the layers in order to create a roof. This move was not necessary in order maintain structural stability but rather was a decision influenced by limited time and the need for the conservation of materials. It boded well for our structure that we would have been able to continue with the same technique for building without there being an issue with the structure’s stability. Our only concerns were specific areas of stress (indicated in photo, right) which were due, not to the structure’s design, but inaccurate placement of bricks.
Photograph: specific areas of stress (photographer: Jasmin Goldberg)
Photograph: final structure (photographer: Alistair Robinson)
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W01 – Key term glossary Beam (Ching, 2008; ENVS10003, 2014, March 17)
• Rigid structural members designed to carry and transfer transverse loads across space to supporting elements • Horizontal element designed to carry vertical load using its bending resistance • Nonconcurrent patterns of forces subject beam to deflection and bending which needs to be resisted by the internal strength of the material – part
compression and part tension Compression: (Newton, 2014)
• Basic structural force • Occurs when an external load pushes on a structural member, causing a compacting of the
particles of the material • Forces result in the shortening of the material under a compression force • Produces the opposite effect of a tension force
Load Path (ENVS 10003, 2014, March 5)
• Load (be it dead or live) takes the most direct route down towards the ground • The load path of a particular force on a structure can be illustrated in a load path diagram
Masonry (Ching, 2008)
• Subset of mass construction • Building of structures from smaller units, usually with the use of mortar as a bonding agent • Properties of the individual unit applicable to the properties of the whole structure • Common materials used: stone, earth, clay and concrete • Structurally most effective in compression
Point Load
• A force applied to the structure at a specific point. Reaction Force (ENVS 10003, 2014, March 5)
• Force that occurs in response to the load the structure is subject to • Equal and opposite to the load on the structure to ensure structure’s stability
Figure 1: Load path diagram (ENVS 10003, 2014, March 5)
Glossary Reference List: Ching, F. D. K., (2008). Building construction illustrated (fourth edition). New Jersey: John Wiley & Sons. 2.14, 12.06. ENVS10003, (2014, March 5). W01 s1 Load Path Diagrams. Retrieved March 15, 2014, from: http://www.youtube.com/watch?v=y__V15j3IX4&feature=youtu.be ENVS10003, (2014, March 17). W03_s1 Structural Elements. Retrieved March 18, 2014, from: https://www.youtube.com/watch?v=wQIa1O6fp98&feature=youtu.be Newton, C., (2014). Basic Structural Forces (I). Retrieved March 15, 2014, from: https://app.lms.unimelb.edu.au/bbcswebdav/courses/ENVS10003_2014_SM1/WEEK%2001/Basic%20Structural%20Forces%201.pdf Knowledge Map (W01) Reference List: Ching, F. D. K., (2008). Building construction illustrated (fourth edition). New Jersey: John Wiley & Sons. 2.08-‐2.09, 2.11 Newton, C., (2014). Basic Structural Forces (I). Retrieved March 15, 2014, from: https://app.lms.unimelb.edu.au/bbcswebdav/courses/ENVS10003_2014_SM1/WEEK%2001/Basic%20Structural%20Forces%201.pdf