Week 1 log book Knowledge map Material Sustainability
Strength
behaviors Construction Material
Shape
Stiffness
Economy
BASIC STRUCTURAL FORCES Force -any influence that produces a change in the shape or movement of a body.
Compression Tension Forces
Forces
Load paths
Dead load & Live loads
Reaction loads
Diagram on next page
Subject Glossary Load paths
Beam & Column ď Ź
Beams are rigid structural members designed to carry and transfer transverse loads across space to supporting elements.
ď Ź Column are rigid, relatively slender structural members designed primarily to support axial compressive loads applied to the ends of the members.
TENSION FORCES ď Ź When an external load pulls on a structural member, the particles composing the material move apart and undergo tension. Tension forces stretch and elongate the material. The amount of elongation depends on the stiffness of the material, cross sectional area, and the magnitude of the load.
COMPRESSION FORCES ď Ź A compression force produces the opposite effect of a tension force. When an external load pushes on a structural member, the particles of the material compact together. Compression forces result in the shortening of the material.
Group activities For the first week's group activities, we plan to use the
timber
bricks
to
establish a tower which provides with a entrance for the toy dog and a roof that can cover the tower.
After our group discussion, we consider that the most simple way for arranging the bricks is probably the most stable way.
While we are building, we think about two related things which is necessary: ď Ź ď Ź
Two bricks' distance
A entrance that allow the toy dog to move in and out loosely. A small Arc that higher the height of the toy dog
As we are making it higher, we find some trouble at the corner that we can only leave the problem at there.
We still use rubber band to make the roof which can cover the top of the tower.
Our tutor put some heavy things on the top of our tower in order to test the stability and we achieve a pretty good result!
The reason why we can succeed is that there is no space between each two bricks and the compression and tension on the brick act equally which is also an important factor.
Comparison with other class
These two towers show me some new ideas of making towers, they make the roof without the rubber band instead of angle tricks for building them. They may not as stable as we are, but in aesthetic view, they have a amazing structural and out looking. This is the information I should acquire from them.
Week 2 Log Book Knowledge map for elearning:
Subject Glossary Structural joints
Bracing
Environmentally Sustainable Design(ESD)
COMMON ESD STRATEGIES
LOLCAL MATERIALS MATERIAL EFFICIENCY THERMAL MASS NIGHT AIR PURGING SOLAR ENERGY WIND ENERGY CROSS VENTILATION SMART SUN DESIGN INSULATION WATER HARVESTING
For this week lecture learning • plastic bowl model • straw • construction system system • structural system details
• Performance&Requirements: object'sSafety&Stability
By using the Cross bracing in order to meet the requirements of Safety & Stability
studio session activities reports Preparation for 'balsa tower'
sharp knife tape & glue pieces of basla
First step: make a draft
With the reference with Performance & Requirements, we plan to make it high and stable. Consider about Aesthetic Qualities, our group plan to make multiple-triangles to make it simple and nice.
This impression drawing I find on the Internet which is close to our plan and draft.
For pratical making part: When we are making the foundation for the tower, we use kind of cross bracing to keep the frame more stable.
More importantly, we add a knee brace frame in the foundation to keep it like a simple K-brace form so that can bear the force act itself more safely.
As we are finish the tower, we find that some of our connection elements are not that stable as we expected. So we add some fixed joints to make the connectors and members more stable and of course more aesthetic.
Comparison with others' group
Our classmates use the simplest triangle way to establish their tower for their group. From my view, indeed it is stable but it must have all the members. If only one of them is cut, the load path will be also block and the force cannot exert on the object itself, therefore it falls down.
In order to test the stability of the tower, we cut some members of the system.
It fells down until we cut some balsa in the bottom, which shows the safety of the tower we made.
The reason of why our tower is more stable than 'the triangles one' is that the load paths are still the same act on the object and the dead load maintain the same as well.
Reference list
Ching, F. D. K. (2008). Building construction illusrated (4th ed.). Hoboken, New Jersey: John Wiley & Sons, Inc.
Figure of ESD, Retrieved from
https://www.google.com.au/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8& docid=s-Rf9Qv140UFoM&tbnid=7XPj2B2F-sro5M:&ved=0CAYQjRw&url=http%3A%2F%2Fbunnco nstruction.homestead.com%2Feco-friendly-design.html&ei=XCIrU9aVBsrUkgXJs4CoBg&bvm=bv.6 2922401,d.dGI&psig=AFQjCNEQtQgYByvowcWWoZHnlD9wiqDxEg&ust=1395422171285334
All the pictures are took individually.