砼轴压构件时变可靠性的敏感度研究

分别给出了结构可靠度指标对随机变量的“分布参数”和“极限状态方程参数”的敏感度定义，用改进的JC法计算砼结构可靠度(包括时变与非时变)，用Matlab编制了计算敏感度的通用程序，并以砼轴压构件为例进行了计算。结果表明：与非时变相比，时变可靠度指标对“分布参数”的敏感程度发生了显著的变化。这对于设计、施工以及维修均具有重大的参考价值。

Sensitivity Analysis of Reinforced Concrete Axial-compressive Members Based on Time-dependent Reliability

The sensitivities of structural reliability index to distribution parameters of random variances and to parameters in limit state functions are respectively defined and the correlative formulas for calculating sensitivities are given out in terms of JC. The general procedure for calculating sensitivities is compiled in Matlab. As an example, the sensitivity analyses on an axial compressive member are done using the procedure above. The results show that the sensitivities of time dependent reliability to distribution parameters change greatly compared with that without time dependent reliability, which are very helpful for design, construction and reparation in buildings.