损伤混凝土强度的确定方法  

Determination Method of Damaged Concrete Strength

作　　者：和海芳[1,2] 张劲泉[2] 程寿山[2] 

机构地区：[1]清华大学土木工程系,北京100084 [2]交通运输部公路科学研究院,北京100088

出　　处：《公路交通科技》2012年第12期74-78,共5页Journal of Highway and Transportation Research and Development

基　　金：交通运输部西部交通科技建设项目(200831822343)

摘　　要：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。It is the core to reflect the original strength of concrete material objectively and accurately that to quantitatively determine the concrete damage degree and create relationship between damage variable and strength. According to uniaxial compressive stress-strain curve and the strain equivalent principle, the stress- strain curve of damaged concrete was obtained while the concrete suffered circulate loading has different degrees of damage and strain of the concrete beyond the peak stress corresponding strain. The relation of damage variable and strain of concrete with different strength grades was derived. The corresponding strain was obtained by testing the damage variable of damaged concrete. According to the testing strength of core samples of damaged concrete with height and diameter of 100 mm and 150 mm, the original strength of concrete material was calculated. Finally, the correctness of the conclusion was verified by test.

关 键 词：桥梁工程 混凝土强度 应变等效原理 损伤 应力应变曲线 

分 类 号：U444.18[建筑科学—桥梁与隧道工程]