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(1 湖南大學(xué)土木工程學(xué)院，長沙 410082； 2 湘潭大學(xué)土木工程與力學(xué)學(xué)院，湘潭 411105)
［摘要］通過4根聚丙烯纖維砂漿鋼筋網(wǎng)加固受彎足尺RC梁的二次受力試驗，研究加固梁不同破壞特征和界限配筋率情況。試驗表明：加固配筋率對加固梁的受彎承載力和變形性能有較大的影響，改變加固配筋率，加固梁分別呈現(xiàn)出受彎適筋破壞、界限破壞和超筋剝離破壞的特征。適筋破壞時，加固梁的屈服荷載和極限荷載提高幅度隨加固配筋率的提高而增大；剝離破壞時，極限荷載提高幅度隨加固配筋率的提高反而下降，加固梁的變形能力也顯著下降。在試驗和分析的基礎(chǔ)上，給出了加固梁界限配筋率的確定方法。
［關(guān)鍵詞］聚丙烯纖維砂漿；加固配筋率；界限配筋率；剝離破壞
Experimental study on critical reinforcement ratio of flexural RC beams strengthened with Polypropylene Fibre Mortar
Bu Liangtao1, Li Hongbing1, Zhou Jing2（1 Civil Engineering College, Hunan University, Changsha 410082, China; 2 Civil Engineering & Mechanics College, Xiangtan University, Xiangtan 411105, China)
Abstract:Four full-size RC beams strengthened with Polypropylene Fibre Mortar were tested to investigate the failure characteristic and critical reinforcement ratio. The results indicate that the strengthened reinforcement ratio plays an important role in increasing the loadbearing capacity and distortion capacity. The ratio of the strengthening bar was varied, three kinds of failure behaviors bending failure, balance failure and edge debonding peeling failure were observed. The yield and limit loads of bending failure beams tend to grow with the increase of the strengthening bar area, however, edge debonding peeling failure beams tend to descend with the increase of the strengthening bar area and the deformation performance of the strengthened beams markedly reduces. Based on the experimental results and analysis, the determination method of critical reinforcement ratio was obtained.
Keywords:Polypropylene Fibre Mortar; strengthened reinforcement ratio; critical reinforcement ratio; edge debonding peeling failure
湖南省交通廳科研基金（200412），湖南省科技廳科技重點科研基金(05SK2010, 2006GK3103)。
作者簡介：卜良桃，博士, 教授，Email：plt63@126.com。
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