基于最大裂缝宽度的钢筋混凝土楼板可靠度分析

Reliability analysis of reinforced concrete slabs based on the maximum crack width

根据一次二阶矩中的验算点法可靠度理论,基于最大裂缝宽度指标中钢筋混凝土构件极限状态下的功能函数,分析了各随机变量的分布类型,利用MATLAB编程实现可靠指标验算。通过计算实例分析了各随机变量对最大裂缝宽度可靠指标灵敏性的影响,数值结果表明:混凝土保护层厚度、楼板有效高度、混凝土轴心抗拉强度以及荷载效应比对可靠指标及灵敏度有不同的影响,本文结论可为钢筋混凝土板式构件的设计提供相关理论依据与指导。

In this paper,the distribution of each random variable in reinforced concrete members under the maximum crack width index is analyzed based on specification of function limit state.According to the checking point method of the reliability theory,reliability index is calculated by MATLAB program.The random variable of the reliability index is studied to discuss the sensitivity of the maximum crack width index,through specific examples.The results show that the thickness of concrete cover,floor height,concrete axial tensile strength and load effect on the reliability index have different effects on reliability index and sensitivity.The result can provide theoretical basis and suggestion for the design of reinforced concrete slabs.