Glenn Sy 638058 WK#2
Introduction and Discussion This week, the tasked required us to make a structure out of balsa wood and super glue. After building the structure, it was concluded that the overall design of the structure is poor. During a test that was conducted by flipping the structure sideways, suspending it in air, and having one person hold the base, the structure bent, which shows that it is not rigid. In addition the structure is durable because it did not break or snap into two. The shape of the structure was a triangular pyramid and spanned almost two metres. Since it is a pyramid, the load is lesser and more viable because there were lesser construction materials used. One of the failure mechanisms of this structure is that if the protruded diagonal columns that support the base are removed then the structure will fall.
Findings First diagram: The structure is not very stable, which is showed through the slanted structure. The lack of bracing showed that the structural frame could not support the load that is compressing on the structure. One of the ways to make it structural stable is by fitting in vertical braces in the frames because the forces are transmitted towards the base in order to increase stability (Tata Steel, BSI&SCI, 2013). Second Diagram: The loads that acted as compressive force along the structure is balanced by the broad surface area through putting up a diagonal post in order to
Glenn Sy 638058 WK#2
spread out the load so that stress decreases, which will produce stability (Interactive structures 2008)
The picture on the right exhibited instability because the weight of dead load could not be withstood due to compression forces. (Interactive Structures 2008). Hence, instability is seen through the building almost collapsing. If there were lateral forces acting on this structure, it will certainly overturn. The picture on the left showed that it was structurally stable because there are knee bracings along the structure with a rigid foundation (Ching 2008).
Glenn Sy 638058 WK#2 Resources: Tata Steel, BSI&SCI 2013, London, viewed 10 Aug 2013, <http://www.steelconstruction.info/Braced_frames#Vertical_bracing>. Images aside from my own diagram: Kilduff S 2013, Week 2 Task, photograph, Tutorial week 2, Melbourne. Ching F 2008, Building Construction Illustrated, Wiley & Sons, New Jersey. Interactive Structures 2008, CD, Wiley&Sons, New Jersey.