| 钢筋混凝土梁腐蚀后疲劳性能的试验研究 |
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| 引用本文： | 王海超,贡金鑫,曲秀华.钢筋混凝土梁腐蚀后疲劳性能的试验研究[J].土木工程学报,2005,38(11):32-37. |
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| 作者姓名： | 王海超 贡金鑫 曲秀华 |
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| 作者单位： | 1. 大连理工大学海岸与近海工程国家重点实验室,辽宁,大连,116024;山东科技大学,山东,青岛,266510
2. 大连理工大学海岸与近海工程国家重点实验室,辽宁,大连,116024 |
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| 基金项目： | 国家自然科学基金资助项目(50078009) |
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| 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。
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| 关 键 词： | 钢筋混凝土 腐蚀 疲劳 疲劳寿命 |
| 文章编号： | 1000-131X(2005)11-0032-07 |
| 修稿时间： | 2004年3月30日 |
AN EXPERIMENTAL STUDY ON THE FATIGUE BEHAVIOR OF CORRODED REINFORCED CONCRETE BEAMS |
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| Wang Haichao,Gong Jinxin,Qu Xiuhua.AN EXPERIMENTAL STUDY ON THE FATIGUE BEHAVIOR OF CORRODED REINFORCED CONCRETE BEAMS[J].China Civil Engineering Journal,2005,38(11):32-37. |
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| Authors: | Wang Haichao Gong Jinxin Qu Xiuhua |
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| Affiliation: | Wang Haichao~ |
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| Abstract: | An experimental study was performed to examine the static and fatigue behavior of lightly corroded reinforced concrete beams.It indicates that the static behavior of lightly corroded 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. |
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| Keywords: | reinforced concrete corrosion fatigue fatigue life |
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