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问题67地铁地下车站地面出入口的建筑设计,考虑与城市景观的协调,目前常采用一些外形较轻巧的钢立柱。按《地铁设计规范》第19.1.7条规定,地铁的地下工程及出入口、通风亭的耐火等级为一级;但是,根据新版《建筑设计防火规范》第5.1.1条规定,一级耐火等级的柱其耐火极限已改定为
Problem 67 The architectural design of the ground floor entrances and exits of the subway underground station, considering the coordination with the urban landscape, currently uses some steel columns with a lighter profile. According to the “Metro Design Code,” Article 19.1.7 stipulates that the subway underground works and entrances, exits, ventilation kiosk level of fire rating; However, according to the new version of “Building Code for Fire Protection,” the provisions of Article 5.1.1, a fire rating The column has its fire resistance has been changed to