CTD

CTD Exercise 1: Greenpoint park framework structure Detail

Rough onsite sketches

What is the primary structure?

It is the usually the frame of the structure also referred to as the skeleton. It holds the cladding inside; it is the support of the structure. In this case the primary structure would be the timber columns and beams.

What is the secondary structure?

It is the structure that keeps the cladding in , it is another form of support system, it is usually steel.

How the bracing works?

Triangulation was used to brace the framed structure at the ends; I found that the last column and beam on each end of the structure was braced by using a timber slat bolted to the column and beam diagonally.  The diagonal brace creates a triangle which spreads any outwards thrust on the structure towards the ground.

How the fixings work to the ground and member to member?

I found that on the framed structure I looked at all the timber slats where fixed together with metal brackets of different shapes and long wall bolts with caps on them.  The double columns where fixed to the ground by inserting the vertical side of the “U” shaped bracket about 200mm into a slit in the column and inserting 2 bolts through . The horizontal side of the bracket is then bolted to the ground with 3 large wall bolts.

How far the members can span?

Columns are spaced approximately 2m apart (C/C), rafters/purlins forming the frame are connected together about every 2 or 3m, The  smaller purlins which lie adjacent to the frame and are connected on the inside of the frame are about 1500mm in span, battens that lie along the top of the purlins can span for about 2m.

PDF if the jpeg isnt clear enough: http://issuu.com/moniquearchi/docs/ctd2-_excercise_1__greenpoint_park_detail 

I really hope you can see the drawing properly as jpeg images dont show line weights properly.