Log book entry 2

Wk 2 CONSTRUCTION STUDIO-­‐STRUCTURAL LOAD AND FORCES GLOSSARY Deflec%on-­‐s the degree to which a structural element is displaced under a load. It may refer to an angle or a distance.

Trussa framework, typically consisCng of raDers, posts, and struts, supporCng a roof, bridge, or other structure.

Gluelam-­‐is a type of structural Cmber product comprising a number of layers of dimensioned Cmber bonded together with durable, moisture-­‐resistant structural adhesives

hinges-­‐The arc traced by a turn of logs along a skyline and generally ploGed graphically to determine ground clearance.

Member-­‐A structural unit, such as a beam or wall..

ACTIVITY-­‐FRAME CONSTRUCTING PROCESS Aim: To build a stable structure long enough to bridge (span) across a 1500mm gap, using limited materials.

In a group of 4 we began by coming up with a design which was going be 1500mm long and stable enough to with stand the weights provided by the tutor.

The ideas such as the I-­‐beam and truss were represented in the designing procedure.

The form of a truss was most favorable as the task was to design a structure which had a span of 1500mm the material which were very weak and fragile such as 600mmx100mmx2mm piece of balsa and a match sCck.

THE EFFIECIENCY OF TRUSSES The truss idea was most favorable as:

• In geometric term the triangular shape is the shape which provides highest rigidity as triangle is the only shape that its internal angle are uniquely define by the length of the side.

• The Forces within the truss is carried by the members equally; therefore no part is wasted (effiecient)

Contrast to a beam. When the load in on the center of the beam, the stresses are much higher there than anywhere else. The material away from the center isn’t doing as much work, lowering the efficiency of the structure.

As represented on the image on the leD the our design which incorporated the structural form of a truss with stood a mass number of blocks.

CRITICAL COLLAPSE POINT CriCcal collapse point In order to determine the collapse point our group decided to put a greater load of block which would guaranteed that the collapse of the bridge as represented on the picture below.

Surprisingly the point collapse was shown to be the very ends of the bridge, and the actually trusses of the structure did not fall away.

Therefore in conclusion of this exercise it is safe to say that the truss structure was very successful.

•

LEARNING LOOP

Due to the limited “600mmx100mmx2mm piece of balsa” the design had to be modified couple of Cmes in the end we decided to join the two main trussed support in to a triangular shape leaving out the top.

In summary we have learnt about the frame building structures and learnt new concepts and terminologies related to frame construcCon.