混凝土结构冻融损伤理论及冻融可靠度分析

ANALYSIS ON RELIABILITY AND FREEZE-THAW DAMAGE THEORY OF CONCRETE

该文基于疲劳累积损伤理论,对混凝土的冻融损伤特性进行了可靠性分析。把混凝土结构冻融破坏近似看作由不同正负峰值温度差顺序作用产生的疲劳累积损伤破坏,给出了常幅温差及变幅温差作用下基于疲劳累积损伤的冻融可靠度计算分析模型,并对某一混凝土构件的冻融损伤可靠度进行了计算分析。

Based on the theory of fatigue cumulative damage,an analysis on the reliability of concrete under freeze-thaw action was carried out.The damage of concrete structures under the action of freeze-thaw may be approximately regarded as the damage due to sequential cyclic actions with various positive-negative peak temperature differences.On this basis,the reliability model of concrete after freeze-thaw cycles is given based on the theory of fatigue cumulative damage.At last,the reliability of one concrete member after freeze-thaw cycles is calculated.