It seems to be the Copan Building with 1160 apartments. If we assume at least 2 people per room and ignore children, that's about 2500 people in a worst case scenario.
Assuming everyone is not a fatass, at 150 lbs. each, that's nearly 200 tons of people trying to get out, or approximately three M1 Abrams tanks.
I doubt this has been engineered for that, nor have the attachments to the building, and neither has the foundation which will be bearing that weight on a very small area.
It is Brasil, I am certain that staircase will fall on its own or some heavy rain fall will wash out the foundation. Good on you for doing the math!
I don't know why people in the upper floors of highrises worry about stairs and elevators. They need to keep parachutes. In the event of fire, just smash out a window and jump.
Some of that weight bearing is engineered into the (hopefully still - standing) building
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