摘要
对8根预应力混凝土梁进行受不同疲劳荷载后的冻融循环试验,研究疲劳荷载作用后预应力混凝土结构的冻融损伤特性。试验结果表明:荷载循环对预应力混凝土冻融损伤的发展有明显影响。运用损伤理论,对混凝土冻融损伤的疲劳效应问题进行了分析,并结合Aas-Jakobsen的混凝土材料疲劳寿命公式,引入疲劳效应影响因子(f(m)),建立了基于相对动弹模量的冻融损伤演化模型。结果表明:该损伤模型具有较高的精度,与试验结果吻合较好,适合工程应用。
Through freeze-thaw cycle test results for 8 specimen pre-stressed concrete（PC） beams,the freeze-thaw damage characteristics of PC structures after fatigue loads were studied.The experimental results show that the fatigue loads had an important influence on the development of freeze-thaw damage.The damage theory was used to analyze the fatigue effect of freeze-thaw damage.Also,according to relative dynamic modulus of test beams,the fatigue load impact factor（f（m）） was introduced to establish the damage evolution model by using Aas-Jakobsen′s fatigue life formula of concrete material.The calculation result of the damage model had a high precision and was in a greement with the experimental result,and thus it is suitable for engineering application.
出处
《南京工业大学学报（自然科学版）》
CAS
北大核心
2011年第3期22-27,共6页
Journal of Nanjing Tech University(Natural Science Edition)
基金
国家自然科学基金资助项目(50878098)
江苏大学博士创新计划资助项目(CX10B_002X)
关键词
预应力混凝土
冻融循环试验
疲劳荷载
损伤
pre-stressed concrete
freeze-thaw cycle test
fatigue load
damage
