钢纤维增强聚合物改性混凝土的疲劳损伤行为

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.

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

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.