| 植筋与开槽的新老混凝土结合面抗剪性能试验分析 |
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| 引用本文： | 孙昊,钱永久.植筋与开槽的新老混凝土结合面抗剪性能试验分析[J].混凝土,2012(6):7-9,16. |
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| 作者姓名： | 孙昊 钱永久 |
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| 作者单位： | 长安大学公路学院;西南交通大学土木工程学院 |
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| 基金项目： | 国家自然科学基金(50978221) |
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| 摘 要： | 新老混凝土能够作为整体共同工作是结构加固的关键问题。针对加固设计中经常出现植筋和开槽的技术比选问题,设计了12个试件,比较了植筋与开槽新老混凝土结合面的抗剪性能和破坏形式。试验结果表明:植筋试件破坏具有延性破坏的特征,而开槽试件破坏具有明显脆性破坏的特征,新混凝土在开槽位置被剪断;植筋试件的抗剪承载力明显高于开槽的处理方式。因此,在结构加固设计时建议采用植筋的处理方式,同时应控制植筋深度和植筋间距。
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| 关 键 词： | 新老混凝土结合面 植筋 开槽 抗剪承载力 破坏特征 试验 |
Test analysis of shear performance for the young-old concrete interface between bonded rebar and grooving |
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| SUN Hao,QIAN Yong-jiu.Test analysis of shear performance for the young-old concrete interface between bonded rebar and grooving[J].Concrete,2012(6):7-9,16. |
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| Authors: | SUN Hao QIAN Yong-jiu |
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| Affiliation: | 1.School of Highway,Chang’an University,Xi’an 710064,China;2.School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China) |
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| Abstract: | The young-old concrete can work together as a whole is the key issue of structural strengthening.Aiming at the technical selection problem appeared frequently in the bridge strengthening about the young-old concrete interface treatments between bonded rebar and grooving,12 specimens were designed to compare with the shear performance and failure modes of the young-old concrete interface.The test results show that the failure characteristics of specimens which embedded steel bars are ductile,but the failure characteristics of specimens which slotted are brittle and the new concrete in slot position were cut off.And the young-old concrete interface shear strength of the specimens which embedded steel bars was distinctly stronger than that of the slotted specimens.So,the treatment of bonded rebar is proposed during the structural strengthening design.At the same time,the depth and distance of the bonded rebar should be well controlled. |
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| Keywords: | young-old concrete interface bonded rebar grooving shear carrying capacity failure characteristic test |
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