火灾下钢筋混凝土构件的可靠性设计

Design method for reliability for reinforced-concrete members exposed to fire

传统建筑结构的抗火设计对工程中的不确定性情况无法给予科学解释。针对这一情况,从结构可靠性指标入手,利用黏聚函数将用以阶积分表示的结构抗力功能函数降阶,从而提出一种计算相对简便的建筑结构抗火设计方法。算例表明,该方法兼有传统的安全系数设计法与可靠性设计法的优点,可以用于建筑构件抗火设计。

This paper follows from the need for an alternative to fire resistance design of conventional reinforced-concrete member which fails to provide scientific explanations o the uncertainty occurring in projects. The paper proceeds from the perspective of the structure reliability index,uses cohesive function to reduce the order of performance function of structure resistance as indicated by higher order integrals, and produces a novel fire resistance design with a relatively simple calculation. The calculation shows that this method combines the advantages of safety factor and reliability and thus promises an application in fire resistance design of building structure.