力学与实践 ›› 2015, Vol. 37 ›› Issue (5): 612-617,611.DOI: 10.6052/1000-0879-14-329

• 应用研究 • 上一篇    下一篇

表面内嵌纤维筋加固混凝土梁破坏模式研究

张延年1, 刘新1, 刘金升1, 付丽1, 郑怡2, 熊卫士3   

  1. 1 沈阳建筑大学土木工程学院, 沈阳 110168;
    2 辽宁省建筑材料监督检验院, 沈阳 110032;
    3 重庆交通建设(集团)有限责任公司, 重庆 401147
  • 收稿日期:2014-10-20 修回日期:2015-12-01 出版日期:2015-10-15 发布日期:2015-10-13
  • 通讯作者: 张延年,博士,教授,主要从事结构抗震、结构检测与加固等方面的研究.E-mail:zyntiger@163.com
  • 基金资助:

    国家自然科学基金(51078065),质检公益性行业科研专项(201510057),辽宁省高等学校优秀人才支持计划(LR2014015)和重庆市自然科学计划(cstc2013yykfA30004)资助项目.

THE FAILURE MODES OF CONCRETE BEAMS STRENGTHENED WITH NEAR SURFACE MOUNTED FRP BARS

ZHANG Yannian1, LIU Xin1, LIU Jinsheng1, FU Li1, ZHENG Yi2, XIONG Weishi3   

  1. 1 School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, China;
    2 Building Materials Supervision and Inspection Institute of Liaoning Province, Shenyang 110032, China;
    3 Chongqing Communications Construction Group, Chongqing 401147, China
  • Received:2014-10-20 Revised:2015-12-01 Online:2015-10-15 Published:2015-10-13

摘要:

为研究不同参数下表面内嵌纤维筋加固后T 形混凝土梁的破坏模式, 对5 根不同梁端锚固、FRP(fiber reinforced polymer) 筋表面特征和FRP 筋类型的T 形混凝土梁进行受弯性能试验. 结果表明, 无梁端锚固、光圆GFRP (glass fiber reinforced polymer) 筋和CFRP (carbon fiber reinforced polymer) 筋加固梁试件发生粘结破坏. 梁端锚固和FRP 筋表面特征影响加固梁试件的极限载荷, CFRP 筋加固梁试件的屈服载荷和极限载荷较大. 螺纹FRP 筋和有梁端锚固加固梁试件FRP 筋利用率较高. 因此, 有梁端锚固的表面内嵌螺纹GFRP 筋加固是最为有效的加固方式.

关键词:

纤维筋|加固|T 形混凝土梁|破坏模式|应变

Abstract:

Focusing on the failure modes, 5T concrete beams with different anchorages, surface characters, materials of FRP bars, strengthened with near surface mounted FRP (fiber reinforced polymer) bars, are used in flexural experiment. It is shown that the bonding failure happens in the strengthened beams without anchorage, and those with plain GFRP bars and CFRP bars. The ultimate load is influenced by anchorage and surface characters of FRP bars; the yield load and the ultimate load are larger in beams strengthened with CFRP bars. The coeficient of utilization of FRP bar is larger for beams strengthened with ribbed FRP bars and anchorage. Therefore, it is most effective to strengthen beams with ribbed GFRP bars and anchorage.

Key words:

FRP (fiber reinforced polymer) bars|strengthened|T concrete beams|failure modes|strain

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