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（湖南大學(xué)土木工程學(xué)院  長沙  410082）
【提要】  進(jìn)行了三根加固梁和一根對比梁的抗彎試驗，考慮了加固前不同應(yīng)力水平下的復(fù)合砂漿鋼筋網(wǎng)加固梁的抗彎性能。結(jié)果表明，復(fù)合砂漿鋼筋網(wǎng)加固梁的極限承載力和截面剛度有顯著提高。加固前初始應(yīng)力水平對加固梁極限承載力影響不十分明顯；初始應(yīng)力水平越高，加固梁截面剛度提高越低。試驗及分析結(jié)果對《高性能復(fù)合砂漿鋼筋網(wǎng)加固混凝土結(jié)構(gòu)技術(shù)規(guī)程》的編制及工程應(yīng)用具有一定的參考價值。
【關(guān)鍵詞】  鋼筋混凝土梁  鋼筋網(wǎng)  復(fù)合砂漿  加固  二次受力  應(yīng)力滯后
Experimental Study on Flexural Performance of RC Beam Strengthened with Reinforcing Steel Bar Mesh Subject to Secondary Load/Bu Liangtao, Yue Feng(Civil Engineering Institute, Hunan Univ., Changsha 410082, China)
Abstract:The test of three RC beams strengthened with reinforcing steel bar mesh an
d one contrast beam is carried out subject to three original stress levels. The flexural bending behaviors of reinforced beams are investigated. The results show that the ultimate load and stiffness of RC beams strengthened with reinforcing steel bar mesh are increasedeffectively, and the enhancement of ultimate load decreased lowly with the increasing of stress before strengthening, and the stiffness decreased obviously with the increase of stress before strengthening. The experimental and analytical results are valuable for Technical Specification for Strengthening Concrete Structure with Forocement Mortor and practical engineering.
Keywords:RC beam; reinforcing steel bar mesh; composite mortar; strengthening;secondary load; lagged strain
*高等學(xué)校博士學(xué)科點(diǎn)專項科研基金項目(20020532008)；湖南省科技廳科技重點(diǎn)項目（05SK2
010）；湖南省交通廳科研基金項目(200412)和長沙市科技局科技資助項目（k05103312）。