When the semi-basement has only one staircase, its area can not be greater than how much What about the specification?

When the semi-basement has only one staircase, its area can not be greater than how much What about the specification?

6 The evacuation stairway of underground and semi-underground buildings shall comply with the provisions of Article 7.4.4 of this Code. In fact, it is true that a staircase must be designed to sink the square, leading to another fire zone door or just climb the ladder to evacuate. It's just a staircase.

4 The safe exit of the recreational venues shall not be less than 2, and the evacuation doors of each room or room shall not be less than 2. When its construction area is less than or equal to 50m2 And often stay the number of not more than 15 people, you can set an evacuation door; 5 underground store and set up song and dance entertainment show entertainment venues of the underground building (room), the local level of 3 and 3 If the height of the floor or above the basement and the outdoor entrance is greater than 10m, the fireproof staircase shall be set up. The underground stairs shall be set up in other underground stores and underground buildings where the recreational and entertainment places should be set.

2 use the number of not more than 30 People and the building area is less than or equal to 500m2 underground, semi-underground building (room), its direct outdoor metal vertical ladder can be used as a second safe exit; 3 Room construction area is less than or equal to 50m2, and often stay no more than 15 people, you can set an evacuation door;

Is the "Building Design Fire Protection Plan" (GB 50016--2006) 5.3.12: 5.3.12 underground, semi-underground construction (room) safety exit and room evacuation door should meet the following requirements: 1 The number of safe exports for each fire zone shall be determined and shall not be less than 2. When there are 2 or more fire partitions on the plane adjacent to the layout, each fire partition can be used on the firewall 1 A fire door leading to an adjacent partition as a second safety outlet, but there must be a safety outlet through the outside;