Zen would have died of frustration if he were still alive, almost everything said in the last few pages is either incorrect or inaccurate. This Tower is totally different compared to the Twin Towers, the configuration of the structure is nothing close to the one envisioned by LERA. What we're seeing right now is not a hat truss, this tower doesn't need one, but a redistribution of loads to different paths. The observation deck will be almost column free space, only having 4 small columns that will carry a portion of the gravity load of the 101st floor slab (since this floor doesn't extend completely to the perimeter columns).
Quote:
Originally Posted by Zensteeldude
You are assuming that Tower One because of it's hight and the spire requires the same structural elements as the Twins. Your assumption is wrong.
Nowhereman1280 is rather close to the mark.
The core takes a bit more than half the gravity load of the entire tower and the spire sits directly on top of the core. No need for a hat truss, the core takes all the gravity load of the spire.
The perimeter steel takes most of the wind loads. The spire is anchored to the perimeter steel via 8 six inch diameter Kevlar cables. No need for a hat truss the perimeter steel takes all the wind load. (Kevlar because it is invisible to electromagnetic radiation.)
Each exterior wall of the tower is called a wind frame, it has to be thought of as a solid plane of steel because that is how it reacts under load.
One last thing, each floor of Tower One is also a strong structural element in and of itself securing the core to the perimeter. (The ends of the main floor beams are actually dovetailed into the concrete walls of the core, something impossible to do if the core were to rise ahead of the floors.)
(Never expect a non-technical answer to a technical question-- Albert Einstein)
|