Week 2: Activity- Frame The model done in week 1 is called mass construction, whereas in this week the model is called framed construction. The task for this week was to construct the highest tower possible by using only 25-40 pieces cut out from a balsa wood. I was put into a group of 3 people and we decided to build a triangle shaped tower. We were allowed to use a cutting knife to cut the pieces of wood into smaller ones and use superglue and pins to connect each piece together.
This image shows the building process. Again similar to last week's task, we had to focus on the height of the structure. The amount of pieces of wood was limited, which made it harder to construct a building that can stand still.
As we built through we eventually confronted the same problem faced last week; the building did not stand straight. We tried to overcome the problem by adding an extra wing-like structure which sticks out from the top left side of the tower. We thought that it will add more weight on the left side of the building and so consequently the building will tilt to the left instead of the right. The left structure is our team's tower and the right one is the other class's tower.
When the tower is standing still, it is at it's centre of gravity; the structure is balanced and at the state of equilibrium. Which means that the gravity load is balanced by the reaction force. The tower did not collapse until one of us use a textbook to gently fan the tower. This proves that the tower was not strong enough and have failed to withstand the added live loads (from the wind). It collapse because the force was not resisted by an equal and opposite reaction force.
In class we explored a few terminologies from the readings.
Let's say that this is a piece of wood. If it is over loaded, the wood will begin to bend. The arrows show the directions of the forces. Cracks will appear at the bottom due to the surface being expanded. This is an example of tension force; when the load pulls the object causing the particles from the object to move apart.
To endure with overloading, a support should be placed where the dark think line is. Not at the bottom.
Let's say that this is an arch. As time goes by, the arch will start to descend in height and spread horizontally, this is due to the force being applied onto the arch. The arrows indicate the directions of the forces. The shaded materials show where external objects are added to stop the arch from flattening over time. Below is a chart taken from week 2's glossary. The word is Veneer.