No. Not quite. It was not overloaded. And the design was good. It was the shortcuts taken by the contractor that built the walkway that caused the collapse. The contractor built the walkway at variance from the design but got an engineer to sign off on the amended design. That engineer never bothered to re-calculate the stresses on the material, and that engineer lost his license because of it. The walkway in the Hyatt was designed to handle any load... which could not have been exceeded by people standing or dancing shoulder to shoulder on the bridge.
But it wasn't built to the design. And the as-built never really got any "engineering" at all. That's why it fell.
They failed to comply with the Structural Engineer's design.
The rods used to hold up the suspended sections were attached in a manner that put the load on one threaded connection at the lowest level, instead of the three that the engineer required.
The threaded rod pulled through the nut and washer...
You are quite correct. It has been a long time since that happened. It was overloaded for the way it ended up being built. It was designed to handle the load, it was just the follow through that sucked.