影响混凝土构件可靠度的因素及相关性分析

基于可靠度与随机变量的极值理论,结合混凝土结构设计规范的要求,建立了混凝土受弯构件正常使用情况下裂缝宽度和挠度的极限状态方程;根据工程设计实际情况确立了影响可靠度指标的相关独立变量;采用自行编制的Matlab程序,对受弯构件正常使用情况下裂缝宽度和挠度的可靠度指标及其影响因素敏感性进行了计算与分析.结果表明,计算模式的不确定性系数和混凝土强度对可靠度的影响显著,同一构件挠度的计算可靠度指标比最大裂缝宽度的计算可靠度指标高.

Analysis of Influence Factors and Correlation of Reliability for RC Members

Based on extreme value theory for the reliability theory and random variables and according to the Code for Design of Concrete Structures,the limit equations of crack and deflection of RC bending members normally used are established.According to the practical engineering condition of design,the independent variables interrelated reliability index are established.A Matlab program for calculating and analyzing the reliability index and the sensitivity of the influence factors of the crack and deflection of the RC bending members normally used is designed.The results show that calculation mode uncertainties and concrete strength obviously affect reliability index and that for the same member,the calculated reliability index of crack is higher than that of deflection.