哈尔滨工程大学学报2024，Vol.45Issue(5)：843-851,9.DOI:10.11990/jheu.202112058
持续荷载作用下疲劳损伤混凝土梁的变形性能分析
Deformation performance analysis of fatigue damage RC beams under sustained loading
摘要
Abstract
To clarify the development law of deformation of concrete beams under cyclic and sustained loads,the effect of fatigue damage on the creep development law of the compression concrete and the deformation properties of beams un-der sustained load were studied.First,fatigue damage was introduced by the bending fatigue test;next,four-beam creep tests with different degrees of fatigue damage were conducted by surcharge loading.Results showed that the maximum crack width of concrete in the tension zone,the total strain of concrete in the compression zone,and the total deflection of fatigue-damaged beams are larger and faster than those in the nondamaged beam under sustained load,and all indica-tors increase with increasing fatigue damage.The development of concrete microfractures is promoted under cyclic load.Fatigue advances and accelerates the development of creep deformation,implying that partial creep strain and creep de-flection are formed in the early fatigue loading.Based on the experimental results,the calculation models of total creep strain in the concrete compression zone and creep deflection of fatigue-damaged beams are established.When the cyclic loading cycles are 0.025,0.15 and 0.60 times the fatigue life,the residual fatigue deflections are equivalent to the creep deflection of the nondamaged beam for 128,800 and 1 180 days,respectively.关键词
钢筋混凝土梁/持续荷载/循环荷载/疲劳损伤/徐变/徐变挠度/变形性能/混凝土裂缝Key words
RC beam/sustained load/cyclic load/fatigue damage/creep/creep deflection/deformation proper-ties/concrete crack分类
建筑与水利引用本文复制引用
吴俊,张军,毛江鸿,金伟良,钟小平,樊玮洁..持续荷载作用下疲劳损伤混凝土梁的变形性能分析[J].哈尔滨工程大学学报,2024,45(5):843-851,9.基金项目
国家自然科学基金项目(51820105012,51908496,51878610,52178171) （51820105012,51908496,51878610,52178171）
浙江省自然科学基金项目(LQ19E080011) （LQ19E080011）
宁波市自然科学基金项目(2021J168). （2021J168）
