外黏AFRP布加固RC梁弯曲性能试验研究
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摘要
首先将AFRP布黏贴于混凝土梁受拉面,在静力加载条件下,研究它们的屈服荷载和极限承载能力,比较其最终的损伤形态。试验表明,与未加固梁相比,加固梁的极限承载能力、屈服荷载提高幅度分别超过40%、18%,且经过外黏AFRP布加固后,梁体损伤形态得到明显改善,试验结果与有限元分析结果吻合较好。未加固梁裂缝集中分布在跨中区域,加固梁因外黏AFRP布提高了其弯曲弹性,裂缝在纯弯段内呈对称形态均匀分布。由此表明,外黏AFRP布加固法能有效改善混凝土梁的弯曲性能。
Aramid fiber reinforced polymer/plastic(AFRP)sheets were bonded at the bending surface of simple supported concrete beams.Yield load,ultimate carrying capacity and its final failure patterns were studied under static loading conditions.Experimental results show that yield load and ultimate bearing capacity of RC beams strengthened with externally bonded(EB)AFRP sheet are increased more than 40%,18% respectively compared with non-strengthened beam.The damage pattern of RC beam is improved obviously while strengthening with EB AFRP sheet.Crack distributions are evenly symmetrically distributed in the form of pure bending section for strengthened beams while cracks are concentrated at the midspan for ordinary RC beam.It is obvious that EB AFRP sheet can improve the flexural performance of RC beam.
Aramid fiber reinforced polymer/plastic(AFRP)sheets were bonded at the bending surface of simple supported concrete beams.Yield load,ultimate carrying capacity and its final failure patterns were studied under static loading conditions.Experimental results show that yield load and ultimate bearing capacity of RC beams strengthened with externally bonded(EB)AFRP sheet are increased more than 40%,18% respectively compared with non-strengthened beam.The damage pattern of RC beam is improved obviously while strengthening with EB AFRP sheet.Crack distributions are evenly symmetrically distributed in the form of pure bending section for strengthened beams while cracks are concentrated at the midspan for ordinary RC beam.It is obvious that EB AFRP sheet can improve the flexural performance of RC beam.
引文
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[12]土木学会.コンクリ蔟ト標準示方書[設計編][S].2007年制定.
[2]李向民,张富文,许清风.黏贴不同FRP布加固预制空心板的试验研究和计算分析[J].土木工程学报,2014,47(2):71-80.
[3]洪芳,张铮.外黏贴加固钢筋混凝土梁黏结界面应力分析[J].河南理工大学学报(自然科学版),2013,32(4):496-500.
[4]李慧敏,高岩,丁亚红.内嵌筋材加固混凝土梁抗弯性能研究[J].河南理工大学学报(自然科学版),2012,31(5):598-603.
[5]王兴国,郑丹丹,朱坤佳,等.试验梁尺寸对简支梁内嵌CFRP板条弯曲性能影响[J].铁道工程学报,2014(3):72-76.
[6]魏洋,吴刚,吴智深,等.FRP加固钢筋混凝土矩形柱的破坏模式及其判别方法[J].土木工程学报,2010,43(增刊):423-428.
[7]刘新强,刘明,由世岐.FRP加固实心黏土砖短柱轴心受压试验研究[J].土木工程学报,2009,42(10):1-7.
[8]冯鹏,张龑华,叶列平.FRP套管砂浆组合加固双轴对称轴压钢构件试验研究[J].土木工程学报,2013,46(9):29-36.
[9]邓江东,宗周红,黄培彦.抗弯加固RC梁中FRP应变性能研究[J].中国铁道科学,2010,31(3):22-25.
[10]HUANG L,LI Y,WANG Y.Strengthening effects of BFRP on reinforced concrete beams[J].Journal of Southeast University(English Edition),2013,29(2):182-186.
[11]岸德光,三上浩,栗桥祐介.AFRPシ蔟トで曲げ补强したRC梁の曲げ耐荷性状に関する实验的研究[C].土木学会论文集,2001,52(683):47-64.
[12]土木学会.コンクリ蔟ト標準示方書[設計編][S].2007年制定.