楼梯间是火灾情况下建筑物内人员疏散的主要通道 ,其在建筑防火设计中是否合理 ,直接关系着人身生命的安全。因此 ,国家规范《建筑设计防火规范》(以简称建规 )和《高层民用建筑设计防火规范》(以下简称高规 )中都分别用重要篇幅对楼梯间的设计进行了规定。但楼梯间的设计在实 Stairwell is the main channel of evacuation of personnel in the building under fire condition. Whether it is reasonable in building fire protection design is directly related to the safety of personal life. Therefore, the national code “Code for fire protection in building design” (hereinafter referred to as “building code”) and “Code for fire protection in high-rise civil buildings” (hereinafter referred to as “high code”), respectively, with an important part of the staircase design. But the staircase design is real