- 摘 要
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（湖南大學(xué)土木工程學(xué)院，長沙 410082）
［摘要］對鋼纖維水泥砂漿加固的抗彎足尺混凝土梁一、二次受力進行了試驗研究。試驗包括1根對比梁和6根用鋼纖維水泥砂漿鋼筋網(wǎng)加固的試驗梁。試驗梁采用三面U形加固形式，量測試驗梁裂縫分布形態(tài)、荷載-撓度曲線、鋼筋和混凝土及加固砂漿應(yīng)變發(fā)展規(guī)律等。通過改變加固梁的加固配筋率和受力形態(tài)，研究了這種加固方法對RC梁的承載力、破壞形態(tài)、截面剛度及裂縫分布等的影響。試驗結(jié)果表明，鋼纖維水泥砂漿加固是一種有效的加固方法,能夠顯著提高鋼筋混凝土梁的抗彎承載力、截面剛度以及抗裂性能。
［關(guān)鍵詞］鋼纖維水泥砂漿；受彎性能；鋼筋混凝土梁；加固
Study on flexural behavior of reinforced concrete beams reinforced by steel fiber ferrocement mortar
Bu Liangtao, Li Wei, Peng Chao（Civil Engineering College，Hunan University, Changsha 410082, China）
Abstract:A full-scale experiment was conducted to study the flexural behavior of reinforced concrete beams reinforced with steel fiber ferrocement mortar which subjected to first and secondary load. A contrastable beam and six test beams reinforced with steel fiber ferrocement mortar were introduced.Beams were reinforced with U-shape, and crack distribution, load-max deflection, concrete strain development, steel and mortar etc. were measured. By changing the reinforcement ratio and the force pattern of reinforced steel bar, the influence of ultimate load, failure mode, section stiffness and fissure’s distributing with this strengthening method was investigated. The results show that steel fiber ferrocement mortar technology is an efficient method to reinforce RC beams, which can obviously increase the load-bearing capacity, section stiffness and crack-resisting behavior.
Keywords:steel fiber ferrocement mortar; flexural behavior;reinforced concrete beams; strengthening
湖南省科技廳科研項目（2007CK3066）。
作者簡介：卜良桃，博士，教授，Email: plt63@126.com。
參考文獻
［1］PRAKASH DESAYI, BALAJI K RAO. Probalilistic analysis of tensile strength of ferrocement［J］. The International Journal of Cement Composites and Lightweight Concrete, 1988,10(1):15-25.
［2］過鎮(zhèn)海. 鋼筋混凝土原理［M］. 北京：清華大學(xué)出版社，1999.
［3］卜良桃，葉蓁，周子范，等. 鋼筋網(wǎng)復(fù)合砂漿加固受彎足尺RC梁二次受力試驗研究［J］. 建筑結(jié)構(gòu)學(xué)報，2006，27(5).
［4］聶建國，王寒冰，等. 高強不銹鋼絞線-滲透性聚合砂漿抗彎加固的試驗研究［J］. 建筑結(jié)構(gòu)學(xué)報, 2005,26(2):1-9.
［5］卜良桃，岳鋒，程露敏. 鋼筋網(wǎng)復(fù)合砂漿加固混凝土梁的裂縫和剛度計算［J］. 沈陽建筑大學(xué)學(xué)報，2007，23(1).
［6］GB50010—2002混凝土結(jié)構(gòu)設(shè)計規(guī)范［S］.北京：中國建筑工業(yè)出版社，2002.
［7］卜良桃，岳鋒. 復(fù)合砂漿鋼筋網(wǎng)加固足尺RC梁的二次受力抗彎性能研究［J］. 建筑結(jié)構(gòu),2006,36(11):23-35.
［8］PARAMASIVAM P, LIM C T E, GONG K C. Strengthening of RC beams with ferroceent laminates［J］. Cement and Concrete Composites,1998,(20):53-65.
