摘要
火灾作用下,温度不断升高使钢材的屈服强度发生弱化,承载力减弱,导致钢结构梁可靠度发生变化。利用钢梁抗弯强度计算公式,建立不同温度下钢梁抗弯可靠度的极限状态方程。采用Rackwitz-Fiessler方法进行钢梁抗弯可靠度指标的计算。对多个温度作用下的普通钢和耐火钢钢梁的抗弯可靠度指标进行计算。
The yield strengths of steels under fire are decreasing as temperature rising, which causes the weakness of carrying abilities. Under this circumstances, the reliabilities of steel beams are also changed. In this paper, the limit state equation of bending reliability in different temperatures is constructed by using of bending strength formula. Then steel beam＇s bending reliability indexs can be calculated with Rackwitz-Fiessler method. The bending reliability indexs for a common steel beam and a fire-resistance steel beam in different temperatures are calculated separately.
出处
《钢结构》
2010年第6期72-75,59,共5页
Steel Construction
关键词
耐火钢
可靠度
钢结构
火灾
可靠度指标
验算点法
fire-resistant steel
reliability
steel structure
firel reliability index
method of checking point
