摘要
对先人工腐蚀和预裂后再人工腐蚀的钢筋混凝土梁试件进行了静力荷载和高周疲劳荷载试验研究,比较了腐蚀对钢筋混凝土梁静力性能和疲劳性能的影响。研究表明,当钢筋腐蚀率较低(小于5%)时,钢筋混凝土梁的静承载力没有明显的变化,但在高周反复荷载作用下,梁疲劳承载力大为降低,特别是试验前预腐蚀的梁,疲劳寿命仅为未腐蚀梁的26%。疲劳承载力降低的原因是局部腐蚀(即使程度很小)导致梁中钢筋出现微缺陷,或使已有的微缺陷扩大,加速了钢筋微裂纹的扩展。所以,对于腐蚀环境中承受反复荷载作用的钢筋混凝土结构,设计中应特别注意腐蚀对结构疲劳性能的影响。
An experimental study was performed to examine crete beams. It indicates that the static behavior of lightly the static and fatigue behavior of lightly corroded reinforced concorroded reinforced concrete beams almost remains unchanged, whereas the fatigue behavior degrades considerably; more specificly, for the cracked and corroded beam, the fatigue life is just 26% of that of the beam without corrosion. It is the local corrosion that causes the occurrence of micro-defect of reinforcement or enlarges the existing defect that speeds up the expansion of micro-cracks. As a result, special care should be taken for reinforced concrete structures in harsh environment and subjected to repeating load to avoid corrosion fatigue failure.
出处
《土木工程学报》
EI
CSCD
北大核心
2005年第11期32-37,101,共7页
China Civil Engineering Journal
基金
国家自然科学基金资助项目(50078009)
关键词
钢筋混凝土
腐蚀
疲劳
疲劳寿命
reinforced concrete
corrosion
fatigue
fatigue life
