EXPERIMENTAL STUDY ON THE FLEXURAL BEHAVIOR OF RC BEAMS STRENGTHENED WITH STEEL BAR/WIRE MESH MORTAR
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摘要: 为既保持钢丝网砂浆或小直径钢筋网砂浆加固混凝土构件的优点，又能大幅度提高被加固构件的承载力，提出钢筋(大直径)钢丝网砂浆加固钢筋混凝土梁的思路。进行了7根钢筋钢丝网砂浆加固梁和1根对比梁的抗弯试验研究，探讨了加固方式和加载方式对钢筋钢丝网砂浆加固梁抗弯性能的影响。试验研究表明，钢筋钢丝网砂浆加固能大幅度提高被加固梁的抗弯承载力；即使在钢丝网用量很少的情况下(施工方便)，加固梁仍具有优异的裂缝控制和位移延性。研究还显示，加载至屈服后卸载、再加固梁的极限承载力与一次受力梁差别很小。该文还给出了加固梁的抗弯极限承载力的计算公式，与试验结果吻合良好。Abstract: In order to both keep the advantages of the RC beams strengthened with wire mesh-mortar or small diameter steel bar-mortar, and increase the load carrying capacity of the strengthened beams significantly, a thought to strengthen RC beams with steel bar/wire mesh mortar was advanced. Seven steel bars/wire mesh mortar-strengthening beams, and one comparative RC beam were produced for a comparison experimental study. The influences of the strengthening methods, and loading conditions on the bending behavior of the strengthened beams were investigated. The research result indicated that the steel bar/wire mesh mortar can significantly increase the moment capacity. Even though under a low reinforcement ratio of wire mesh the strengthened beams still have a good crack control property and displacement ductility. It was also showed that the moment capacity of once-loading beams has very small difference from that of the beams subjected to a preloading onto yield before strengthening. The calculation methods for predicting the moment capacity of the strengthened beams were also provided and show a good agreement with the tested results.
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Keywords:
- steel bar/wire mesh mortar /
- RC beam /
- strengthening /
- load bearing capacity /
- ductility /
- anti-cracking property
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