大体积混凝土结构随机温度徐变应力计算方法研究

首次尝试将随机有限元法引入大体积混凝土结构随机温度徐变应力的计算．综合考虑各种随机因素，对于由材料物理参数随机性引起的随机温度场的影响，本文给出了相应于初应变隐式解法的随机有限元计算方法；对于周期平稳随机温度场对徐变应力场的影响，本文提出了复模量隐式解法，并首次视复频响应函数为材料参数的随机函数，给出了相应的复频响应－随机有限元列式；而对于一般非平稳绝热温升温度场的影响，本文提出了参数调幅逐段简化的方法．本文方法有效地克服了前人不能考虑材料参数随机性或需弹模不随时间变化的局限性

METHODS FOR RANDOM THERMAL CREEP STRESS ANALYSIS OF MASSIVE CONCRETE STRUCTURES

Stochastic finite element method for random the rmal creep stress inmassive concrete structures is presented. In the proposed method, various kinds of random factors including material physical parameters and random temperature in concrete are taken into account. Owing to the effect of stochastic environmental temperature, hydration heat of concrete and random heat conductivity parameters, the temperature in concrete appears to be non-stationary process. Based on the linear creep law, the effect of temperature in concrete is seperated into three parts, which are dealt with seperately. The suggested method can sovle all possible case combinations of the effect of (1) random parameters (random variables),(2) periodic stationary process of temperature, and (3) non-stationary process of temperature in concrete, and thus is useful for the safty analysis of mass concrete structures during the construction and operation period in the design situation.