（湖南大学土木工程学院  长沙  410082）
【提要】  进行了三根加固梁和一根对比梁的抗弯试验，考虑了加固前不同应力水平下的复合砂浆钢筋网加固梁的抗弯性能。结果表明，复合砂浆钢筋网加固梁的极限承载力和截面刚度有显著提高。加固前初始应力水平对加固梁极限承载力影响不十分明显；初始应力水平越高，加固梁截面刚度提高越低。试验及分析结果对《高性能复合砂浆钢筋网加固混凝土结构技术规程》的编制及工程应用具有一定的参考价值。
【关键词】  钢筋混凝土梁  钢筋网  复合砂浆  加固  二次受力  应力滞后
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
*高等学校博士学科点专项科研基金项目(20020532008)；湖南省科技厅科技重点项目（05SK2
010）；湖南省交通厅科研基金项目(200412)和长沙市科技局科技资助项目（k05103312）。