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为了预测冻融循环损伤后混凝土梁的受弯极限承载能力,提出一种基于混凝土材性变化的预测方法.该方法首先分析混凝土材料受冻融循环损伤的特点,并提出将冻融循环损伤后混凝土的抗压强度作为损伤指标,然后通过图形等效的方法来简化冻融损伤后混凝土的受压应力-应变曲线,推导出受弯极限承载力计算公式.理论预测结果和试验实测数据表明,该预测方法能够有效地预测冻融循环损伤后混凝土梁的极限荷载.但是当混凝土残余抗压强度小于50%时,由于黏结滑移现象以及冻融循环损伤的随机性,预测结果的精确性将下降.
In order to predict the ultimate bearing capacity of concrete beams after freeze-thaw cycles, a prediction method based on the change of concrete material properties is proposed. The method firstly analyzes the characteristics of concrete materials subjected to freeze-thaw cycles, Compressive strength of concrete is taken as the damage index, and then the compressive stress-strain curve of the concrete after freeze-thaw damage is simplified by the graphic equivalent method, and the formula of the ultimate bearing capacity of the concrete is deduced.Theoretical prediction results and experimental data show that, This prediction method can effectively predict the ultimate load of concrete beams after the freeze-thaw cycle damage.But when the residual compressive strength of concrete is less than 50%, the accuracy of prediction results due to the phenomenon of bond slip and the randomness of freeze-thaw cycles decline.