| 摘要: |
| 通过梁式黏结试验，对不同钢纤维掺量下活性粉末混凝土与钢筋之间的黏结性能进行了研究.结果表明：钢纤维的加入可以阻止裂缝的出现和发展，使试件的破坏形式由脆性破坏转变成明显的塑性破坏，在不配置箍筋的情况下得到黏结应力滑移（τ s）关系曲线的下降段，提高了试件的延性；随着钢纤维掺量的增加，钢筋的极限黏结应力τu及其对应的滑移值su增大，钢纤维掺量较小（φf=0.5%）时，影响较小，当钢纤维掺量由0.5%增至2.0%时，τu增加42.53%，su由0.3274mm增加到0.9838mm，较φf=0.5%时增加2.0倍；为消除抗压强度fcu对黏结性能的影响，采用相对黏结强度τu/fcu来考查钢纤维掺量的影响，根据试验数据拟合出τu/fcu及su的经验公式，可为工程设计提供参考. |
| 关键词: 活性粉末混凝土 梁式试验 钢纤维掺量 黏结应力滑移 相对黏结强度 |
| DOI：10.3969/j.issn.1007 9629.2012.06.022 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（50508005）;国家高技术研究发展计划(863计划)项目（2006AA03Z536） |
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| Effect of Fibers on Bond Properties Between Steel Bar andReactive Powder Concrete |
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JIA Fang fang, AN Ming zhe, ZHANG Hong ru, YU Zi ruo
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School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
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| Abstract: |
| Effect of steel fibers on the bond proprieties between reactive powder concrete(RPC) and steel bars was evaluated. The results show that：without steel fibers, the specimen will experience very sudden and quick bond deterioration. The presence of steel fibers will increase the peak bond strength and responding slip, improve the ductility of the specimen, result in the change of failure mode from brittle to plastic, then descending branch of bond stress slip(τ s) curve can be obtained without stirrups. To eliminate the influence of compressive strength fcu, relative ultimate bond strength τu/fcuwas introduced. Empirical formula of relative ultimate bond strength and the responding slip related to steel fiber contents was established, which provide a reference for the engineering design. |
| Key words: reactive powder concrete(RPC) beam bond test steel fiber content bond stress slip relative bond strength |
