火灾作用下钢梁截面选择设计的实用方法

Practical Methods of Choice Design for Girder Section in Fire

在火灾作用下,火灾高温会使钢构件破坏甚至造成结构的倒塌。目前,国内外绝大多数钢构件抗火设计都是按照强制性的建筑防火规范的要求进行设计验算,然后通过涂覆防火涂料来满足规范规定的耐火极限,但是采用涂覆防火涂料来满足构件耐火极限的方法存在很多缺点。通过对国内外相关研究进行分析,介绍了采用增大钢构件截面尺寸来满足构件耐火极限的方法,提出了在火灾条件下满足耐火极限的钢梁截面选择设计方法,并通过例子论证这种设计方法的有效性。

Due to the high temperature of fire, the steel component is supposed to be destroyed and the structure is likely to be broken down. Internationally and domestically, the majority of the fire-proof steel components at present are designed and checked according to the compulsory fire resistance standards in construction and the high-point of fire resistance is achieved by means of fire-proof coating, which has many disadvantages. Analysed relative studies about this topic in and outside China, this paper is introducing a new designing method on fire resistance through enlarging the section size of steel component and has proved the effectiveness of this method with evidence.