Fig 1: The Bird's Nest Stadium
The structure looks complicated and difficult to contruct from first glance, but when the programme tailored out the concept behind the structures, it was pretty clear to how it works (at least to me anyway). It's a "box within a box" type of structure. The inside arena is constructed as concrete bowl. Yea, concrete bowl to support the seating arena. The bowl is splitted into 6 pieces through movement joints and they acted as an independent structure, where, in the event of an earthquake and should the stadium are to collapse (fingers cross), it'll crack through the joints and collapse at the designated area (i.e. piece by piece).
Fig 2: The Outer Box (look at the size of the beast!)
The outer box as you can see, comprises strings of huge rectangular hollow sections, wrapping around the stadium in a complete mad angles. The beams are huge. super huge! and i've never seen anything this big before. They are prefabricated sections and are designed to accomodate seismic movements, therefore, in the event of an earthquake, it'll be flexible enough to not collapse(fingerscross!). It's an extremely high yield stress steel grade and high compressive stress concrete grade(RC80 if i'm not mistaken) to construct the stadium. You should seen the moment they cast the concrete onto the bowl. It just looks so dry . . .a lot of cement content!
Fig 3: Seating arena
I think i would like to visit the stadium sometime to see the amazing structure with my own eyes. It's just unbelievable. To me, the bird's nest is the most complicated stadium to be constructed in our hystory (unless there is/are more stadiums which i'm not aware of?) which was on time and to budget. This is just so unique. Ppl tend to think about high rise for amazing buildings but nope. . .the architect working for the bird's nest stadium had proved that you don't have to be high to be famous . . a little bit of imaginations and lateral thinking will equally make you as famous as the burj dubai tower!
P.S. Pictures were stolen from google image. so if any of you can't get enough of it, google it. you'll find lots in there!
Ta~~~