混凝土简支梁设计基准期内的可靠度

根据统计资料对不同类型建筑在不同防火措施下发生火灾的概率研究,得出了各类建筑达到轰燃的概率.基于蒙特卡罗随机有限元方法,引入材料高温本构关系、截面尺寸和计算模型系数等的变异性,按照ISO标准升温曲线升温,给出了单构件轰燃下的失效概率计算方法.最后,将设计基准期内建筑物达到轰燃的概率与单构件轰燃下的失效概率组合,给出了设计基准期内建筑构件在火灾下的失效概率公式.

Reliability of concrete simple-supported beam under fire during design period

Through the statistical data for different types of building and different fire prevention measures,this paper presents failure probability of buildings under developed fire.Based on the Monte-Carlo stochastic finite element method and introduction of constitutive law of material unden high temperature,section dimension,calculation model coefficient,and a temperature raise according to standard temperature curve in ISO,a method is given for calculating the fail probability of single member under fire.At last,combined the fail probability of building under fire during design period and that of single member under fire,a formula is given for calculating the fail probability of a single member under fire during design period.