单调荷载下冻融混凝土应力-应变关系试验研究

Study on stress-strain relationship for freezing-thawing concrete under monotonic loading

混凝土应力-应变关系是冻融损伤钢筋混凝土结构非线性分析的基础,利用不同强度等级的两批24个混凝土试件(100 mm×100 mm×300 mm)冻融试验,探讨了试件表面形态、质量损失率随冻融循环次数的变化规律;通过单调加载试验,研究了单调荷载作用下冻融损伤混凝土试件的破坏特征,揭示了单调荷载作用下冻融损伤混凝土应力-应变关系随冻融循环次数的变化规律,分析了冻融损伤混凝土应力-应变关系曲线特征参数(峰值应力、峰值应变)与冻融循环次数之间的关系,提出了单调荷载作用下冻融损伤混凝土应力-应变关系计算模型。

Concrete stress-strain relationship is the basis of nonlinear analysis of freezing-thawing damage reinforced concrete struc-tures.By experimenting on 24 specimens concrete （100 mm×100 mm×300 mm）exposed to freezing-thawing cycles,its surface form and the relationship of mass loss rate versus freezing-thawing cycles were discussed;through the monotonic loading experiment.It studied the failure characteristics of freezing-thawing damage of concrete specimens under monotonic loading ,reveals the relationship of freez-ing-thawing damage concrete stress-strain versus freeze-thawing cycles under monotonic loading ,analyses the relationship between char-acteristic parameters of freezing-thawing damage concrete stress-strain curves and freezing-thawing cycles and proposes freezing-thaw-ingdamage concrete stress-strain relationship model.