冀晓东,宋玉普.冻融循环作用后钢筋与混凝土粘结性能试验研究[J].,2008,(2):240-245 |
冻融循环作用后钢筋与混凝土粘结性能试验研究 |
Experimental research on bond behaviors between steel bars \=and concrete after freezing and thawing cycles |
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DOI:10.7511/dllgxb200802016 |
中文关键词: 钢筋 混凝土 粘结性能 冻融循环 |
英文关键词: steel bars concrete bond behavior freezing and thawing cycles |
基金项目:国家自然科学基金资助项目50479059. |
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中文摘要: |
试验研究了3种螺纹钢筋和1种光圆钢筋在经受0、15、30和50次冻融循环作用后,混凝土粘结性能的变化,得到了冻融循环作用后拔出荷载与钢筋滑移量的关系曲线,分析了4种钢筋遭受冻融循环作用后的粘结性能变化规律.结合拔出试验试件的破坏形态和混凝土冻融破坏机理,分别探讨了光圆钢筋和螺纹钢筋与混凝土在冻融循环作用后粘结性能的退化机理.冻融循环作用后,钢筋与混凝土粘结性能下降,峰值荷载减小,钢筋的峰值滑移量增加. |
英文摘要: |
The bond behaviors between four kinds of steel bars (three kinds of deformed steel bars and one kind of plain bar) and concrete after exposed to 0, 15, 30 and 50 freezing and thawing cycles are investigated through pull-out tests. The pull-out resistance-slip curves are obtained. The effects of freezing and thawing on the bond behavior of steel bars and concrete are analyzed respectively. The decaying mechanism of the bond behavior between steel bars and concrete exposed to freeze-thaw injury is discussed, based on analyzing the mechanic behavior of concrete after freezing and thawing and bond mechanism between reinforcement and concrete. The bond behavior between steel bar and concrete decreases, and the load at the peak declines and the slippage at the peak increases after freezing and thawing. |
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