不确定因素影响下混凝土结构温度应力计算

摘要

温度应力仿真分析是温度控制设计的基础，对工程的施工和安全有重要作用。混凝土结构的温度应力受很多不确定因素的影响。选取混凝土线膨胀系数、弹性模量、徐变度和温度增量4个主要参数，引入区间数理论，结合有限元方法，在综合分析影响混凝土温度应力参数的不确定性的基础上，推导了相应的温度应力随参数变化的区间计算公式，建立了不确定因素影响下混凝土结构温度应力有限元计算方法。%The thermal stress simulation analysis is the foundation of the temperature control design, and it has important effect on the construction and safety of the project. The thermal stress in concrete structure is influenced by many factors. It selected linear expansion coefficient, elastic modulus, temperature increments and creep rate as 4 main parameters with characteristic of interval distribution. Combining with interval theory and finite element method, the calculation formula for the interval of thermal stress with variation of parameters was deduced based on a comprehensive analysis of the impact of concrete temperature and established calculation method for the thermal stress of concrete structure under the influence of uncertain factors.