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定量判定混凝土材料的损伤程度和建立损伤变量与强度的关系是客观准确地反映混凝土材料的原始强度的核心。根据混凝土单轴压缩应力-应变关系,基于应变等效原理,考虑当应变超过峰值应力对应的应变值时,混凝土遭受反复加卸载作用,存在不同程度损伤的情况,建立了带损伤混凝土的应力应变关系曲线;同时推导得出不同强度等级混凝土损伤变量与应变的关系式。通过测试带损伤混凝土的损伤变量,求得其对应的应变值,然后结合高度和直径均为100 mm或150 mm带损伤芯样的测试强度,计算求得混凝土材料的原始真实强度。最后,通过试验验证结论的正确性。
Quantitatively determine the degree of damage to concrete materials and establish the relationship between damage variables and strength is to objectively and accurately reflect the core of the original strength of concrete materials. According to the uniaxial compressive stress-strain relationship of concrete, based on the principle of equivalent strain, when the strain exceeds the peak value corresponding to the strain value, the concrete is subject to repeated loading and unloading and there is some damage. The stress and strain of the concrete with damage Relationship curve; at the same time derived different intensity levels of concrete damage variables and strain relationship. By measuring the damage variables of the damaged concrete, the corresponding strain values are obtained. Then, the original true strength of the concrete material is calculated by combining the test intensity of 100 mm or 150 mm diameter damaged core samples with the same height and diameter. Finally, the correctness of the conclusion is verified through experiments.