Why can't the staircase room tear down the whole wall and change the doorway?

Stairs in residential buildings are evacuation stairs, and some even fire stairs. These stairs are specially designed. In addition to ensuring the room area before evacuation, the walls are also very strong. In order to ensure that people can escape smoothly in case of fire or earthquake, evacuation stairs have high stability.

So the lower floor is a column net structure, and the four corners are columns. High-rise buildings are mostly shear walls, and the walls cannot be removed. And the door is open in the direction of evacuation, fire door.

Non-professionals should not change stairs!