I'm not sure whether the Supporting steel it a portal fram as it has a knee joint to transfer the bending moment down, however it also looks like a truss has been used to span the large distance.
Here you can see the bracng and additional suppport.
You can see the cleat that's welded to the 'I' beam. The 'Z' purlin was made from metal sheeting and i bent it using a metal bender. You can see the bolts that connect it to the cleat and the 10mm gap that raises the purlin off the rafter. 
We were driving into uni today and we're so excited when saw these massive trucks that were transporting the precast concrete panels. Only a construction student would be that happy to see a truck. Crazy stuff.
Anyway when it approached the next corner it struggled to complete a U-turn in the space provided. One issue when ordering concert panels is to ensure that thy can be transported to the sight, therefore it’s recommended that concrete panels are no lager than approximately 9m X 4m.
In my photo’s you can see the truck attempting to do a U-turn to access the sight.
I went to melbourne today and i'm still facinated by the roof over spencer street station. I found the best website that shows the step by step development of the roof. It's worth checking out. 
When I took these photo’s I noticed that although it was a complicated structure, it's very repetitive. Perhaps the structured is so detailed and complex because of the large span and curved surface. The construction procses developed by deviding the roof into heaps of small sections which were latter held in place by a crane and welded.
This is an arial view of the roof. It's pretty cool.
This photo of the knee joint connection of the portal frame with a box gutter is simular to what I am doing for my major project. I notice the hunching that gives extra support to the beam so it can have a larger open span. We can clearly see the bracing, the bolts and welding that connect the ‘I’ beams, the underside of a box gutter, extra stiffening between the flanges of the column, the purlins, cleats and the girts.
Shown in this photo is the apex connection for north wall at Bunning’s warehouse. We can see the bolted connection of the rafter, as well as the hunching that adds additional strength. A central column, allows the warehouse to span a greater distance as us spreads the weight more evenly.
This shop drawing shows the layout of my 'I' Beam. We can seen where the cleats and bolts are situated.
This shop drawing articulates the location of the roof bracing.
This shop drawing the is used to create my precast concrete pannel. You can see the location and sizes of elements that are precats such as the welding plate.
This is my precast load bearing concrete panel, with a pre cast plate to weld my rafter to.
I've been looking at both load bearing concrete walls and steel construction for my project and I fond these sites really useful:
www.bluescopesteel.com.au
Good details of different fixings and general information such as standard sizes.
www.homeimprovementpages.com.au
This site has some useful links and acts like the yellow pages as it lists professional in different fields.
www.cement.org
Great general information.
I think the work of Frank Lloyd Wright (1867-1959) would be interesting to look at for my major project. In particularly the Influenced by the industrial revolution his designs display an interest in developing new materials and experimenting with there properties. For example he manipulated sheet metal with a patterned surface making it both decorative and functional. He also used the individual properties of concrete to create revolutionary designs.
Wrights architecture is organic as it blends with the environment and surroundings, as he incorporates spatial and sculptural together. To achieve this he used materials and elements from the natural landscape including stone. The buildings had and organic flow to them as movement of people began at one place and followed a journey to finish at another. Frank Lloyd Wright sometimes referred to organic architecture as one in which “all parts were related to the whole.” I would like to make the warehouse organically fit within its site.
The Johnson Wax building used large concretes mushroom, ‘dendriform’ shaped structures that are two stories tall to support the roof. The construction of the building created controversy in its structural design as the “Lilly pad’ shaped columns were not in according to building codes at the time. Building inspectors required that a test column be built and loaded with twelve tons of material. The test column, once it was built, was loaded with sixty tons of materials before the "calyx", or part of the column that meets the lily pad, cracked (crashing the 60 tons of materials to the ground, and bursting a water main 30 feet underground). Wright was given his building permit after this demonstration.
Wright’s use of concrete was revolutionary, as he used it as both a decorative and structural element. Reinforced prefabricated concrete was a common element in his buildings. This is one element that I will incorporate in my warehouse design.
It is important to note that event though the architecture of Frank Lloyd Wright was revolutionary and advanced it still contains imperfections, such as cracking in the large cantilevers of his Fallingwater.
Although this is a very simple detail, it’s a common element that needs to be considered in construction. The timber is protected by the aluminium capping and the overlapping of the Zincalome Flashing stops water entering.
