| 摘要: |
| 采用240mm×150mm×1200mm梁式黏结试件，通过0，50，75，100次快速冻融循环试验研究了盐冻循环作用对钢筋混凝土黏结强度，黏结刚度，初始滑移值，极限滑移值，破坏形态等指标的影响规律，并采用最小二乘法拟合得到盐冻作用后的黏结滑移本构方程.结果表明：随着冻融次数的增加，钢筋混凝土初始滑移和极限黏结强度均逐渐降低，且前者降幅更为显著；冻融循环次数越多，相同黏结应力水平下滑移量越大，黏结刚度越低，滑移量增长也越快；箍筋能有效地抑制和延缓盐冻融作用环境下纵筋与混凝土黏结性能的劣化程度. |
| 关键词: 混凝土 盐冻 黏结性能 耐久性 |
| DOI：10.3969/j.issn.1007 9629.2013.01.007 |
| 分类号: |
| 基金项目:湖北省自然科学基金计划创新群体资助项目（2010CDA076）；高速铁路建造技术国家工程实验室开放基金资助项目；湖北省教育厅科学研究计划重点资助项目(D20091310) |
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| Beam Test of Bond Behavior between Steel Bar andConcrete in Salt Frost Environment |
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XU Gang, AI Tian cheng, XIE Xiao juan, WANG Qing
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College of Civil Engineering & Architecture, China Three Gorges University, Yichang 443002, China
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| Abstract: |
| Using beam specimens(240mm×150mm×1200mm) the influence of the salt frost cycles on the steel concrete bonding strength, bonding stiffness, initial slippage, ultimate slippage, the failure pattern and other indexes was investigated through 0, 50, 75, 100 fast freeze thaw cycles tests, then the bond slip constitutive equation after the salt frosting action was fitted by least square method. The test results show that with the increase of freezing and thawing cycles, the initial slip strength and the ultimate bonding strength tend to degenerate, and the former amplitude reduction is more significant. The more the times of the freezing and thawing cycles, the greater slippage at the same bond stresses, the lower bonding stiffness, the faster slip growth. Stirrups can effectively inhibit and delay the deterioration degree of the bond property between the longitudinal steel and the concrete under the freeze thaw environment. |
| Key words: concrete salt frost bond property durability |
