钢纤维增强聚合物改性混凝土的疲劳损伤行为  

Fatigue Damage Behavior of Steel Fiber-Reinforced and Polymer-Modified Concrete

作　　者：刘逸平[1] 汤立群[1] 黄小清[1] 刘泽佳[1] 

机构地区：[1]华南理工大学交通学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2007年第2期18-22,共5页Journal of South China University of Technology(Natural Science Edition)

基　　金：广东省自然科学基金资助项目(05006591)

摘　　要：对钢纤维增强聚合物改性混凝土这种新材料的弯曲疲劳损伤特性进行了试验和理论研究,并且和钢纤维增强混凝土进行了对比.通过合理定义损伤变量,由试验测定了新材料和钢纤维增强混凝土的疲劳损伤及其演化规律;根据疲劳累积损伤理论,提出了新形式的疲劳损伤演化方程,与试验结果对比,该方程能较好地反映新材料的损伤演化规律.对两种混凝土材料在相同加载应力水平下的疲劳损伤演化行为进行了比较,结果表明钢纤维增强聚合物改性混凝土比钢纤维增强混凝土具有更好的抗疲劳性能.The bending fatigue damage behaviors of a new kind of material--steel fiber-reinforced and polymermodified concrete was experimentally and theoretically investigated, and the results were compared with those of steel fiber-reinforced concrete. Then, by reasonably defining damage factors, the fatigue damages and the corresponding evolution principles of the new material and the steel fiber-reinforced concrete were measured by experiments. A new fatigue damage evolution equation was proposed according to the fatigue accumulative damage theory, the effectiveness of which was verified by experimental results. Finally, the fatigue damage evolution behaviors of the two above-mentioned materials under the same stress were analyzed and compared. The results show that the steel fiber-reinforced and polymer-modified concrete is of better fatigue resistance than the steel fiber-reinforced concrete.

关 键 词：钢纤维增强 聚合物 混凝土 弯曲疲劳 损伤 

分 类 号：U443.33[建筑科学—桥梁与隧道工程] O346.2[交通运输工程—道路与铁道工程]