混凝土结构温度徐变应力的首次超越可靠度

THE FIRST EXCURSION RELIABILITY ANALYSIS OF MASS CONCRETE STRUCTURES INFLUENCED BY RANDOM THERMAL CREEP STRESSES

基于随机有限元法，充分考虑大体积混凝土结构徐变温度应力计算中的各种随机因素，视混凝土温度场、弹模、徐变度以及抗力等为非平稳随机过程，针对非线性功能函数情况，首次提出了大体积混凝土结构随机温度徐变应力首次超越可靠度的计算方法．该方法可以方便地退化为求解任一时刻混凝土结构的静态可靠度．

Based on stochastic finite element method, numerical methods of the first crossing reliability of mass concrete structures are suggested, in which the nonlinear performance function is dealt with and various kinds of random variable including non-stationary thermal field, modulus of elasticity, creep compliance and the parameters of strength of concrete are taken into account. Thesuggested method can be conveniently degraded to calculate the time-invariant structural reliability and therefore is useful for the practical engineering.