HPFL加固RC梁抗弯疲劳性能试验研究
|
摘要
为了研究用高性能水泥复合砂浆钢筋网(High performance ferrocement laminate,简称HPFL)加固钢筋混凝土梁的疲劳性能,对11根对比梁和加固梁进行了静力和疲劳性能试验。试验结果显示,与未加固梁相比,加固梁的疲劳性能有明显改善,疲劳寿命提高16%~104%。在经过相同的循环次数之后,加固梁跨中挠度减小30%以上,混凝土和钢筋应变有所降低,裂缝宽度和间距也显著减小。没有植剪切销钉的构件发生了加固层与构件混凝土之间的界面剥离破坏,但端部植入一定数量的剪切销钉后就能避免发生这种破坏模式。
In order to study the fatigue behavior of RC beams strengthened with high performance ferrocement laminates(HPFL),static and fatigue experiments were conducted on eleven beams with and without HPFL.The results show that compared with the control specimen,the fatigue behavior of strengthened beams was obviously improved and the fatigue life of repaired beams is increased by 16%～104%.After the same number of cycles,the deflections of strengthened beams are decreased by more than 30%.The strains of concrete and steels are reduced to some extent,both the width and space of the cracks diminish greatly.The failure mode of the specimen without shear dowels is debonding between the interface of HPFL and concrete.However,this failure mode can be avoided by planting shear pins at the end of beams.
In order to study the fatigue behavior of RC beams strengthened with high performance ferrocement laminates(HPFL),static and fatigue experiments were conducted on eleven beams with and without HPFL.The results show that compared with the control specimen,the fatigue behavior of strengthened beams was obviously improved and the fatigue life of repaired beams is increased by 16%～104%.After the same number of cycles,the deflections of strengthened beams are decreased by more than 30%.The strains of concrete and steels are reduced to some extent,both the width and space of the cracks diminish greatly.The failure mode of the specimen without shear dowels is debonding between the interface of HPFL and concrete.However,this failure mode can be avoided by planting shear pins at the end of beams.
引文
[1]ACI Committee.A guide for the design,construction and re-pair of ferrocement[J].ACI Structure Journal,1988,85(3):323-351.
[2]蒋隆敏,张毛心.国内外关于钢丝网水泥砂浆用于RC结构加固的研究[J].世界地震工程,2004,20(2):139-144.JIANG Long-min,ZHANG Mao-xin.Research on strengthen-ing methods of RC structure with ferrocement laminates athome and abroad[J].World Earthquake Engineering,2004,20(2):139-144.
[3]尚守平,曾令宏,彭晖,等.复合砂浆钢丝网加固RC受弯构件的试验研究[J].建筑结构学报,2003,24(6):87-91.SHANG Shou-ping,ZENG Ling-hong,PENG Hui,et al.Flexural behavior of reinforced concrete beams with ferroce-ment[J].Journal of Building Structures,2003,24(6):87-91.
[4]尚守平.高性能水泥复合砂浆钢筋网加固混凝土结构设计与施工指南[M].北京:中国建筑工业出版社,2008:5-17.SHANG Shou-ping.A guide for the design and construction ofRC structures strengthened with High Performance Ferroce-ment Laminate[M].Beijing:China Architecture&BuildingPress,2008:5-17.
[5]滕锦光,陈建飞,史密斯S T,等.FRP加固混凝土结构[M].北京:中国建筑工业出版社,2005.TENG Jin-guang,CHEN Jian-fei,Smith S T,et al.FRPstrengthened RC structures[M].Beijing:China Architecture&Building Press,2005.
[6]Barnes R A,Mays G C.Fatigue performance of concretebeams strengthened with CFRP plates[J].Journal of Com-posite for Constructions,ASCE,1999,3(2):63-72.
[7]Shahawy M,Beitelman T E.Static and fatigue performance ofRC beams strengthened with CFRP laminates[J].Journal ofStructure Engineering,ASCE,1999,125(6):613-621.
[8]刘沐宇,李开兵.碳纤维布加固混凝土梁的疲劳性能试验研究[J].土木工程学报,2005,38(9):32-36.LIU Mu-yu,LI Kai-bing.Fatigue performance of RC beamsstrengthened with CFRP sheets[J].China Civil EngineeringJournal,2005,38(9):32-36.
[9]尚守平,龙凌霄,曾令宏.销钉在钢筋网复合砂浆加固混凝土构件中的性能研究[J].建筑结构,2006,36(3):10-12.SHANG Shou-ping,LONG Ling-xiao,ZENG Ling-hong.Study of the pins in reinforced concrete beam strengthenedwith ferrocement[J].Building Structure,2006,36(3):10-12.
[10]Heffernan P J,Erki M A.Fatigue behavior of reinforcedconcrete beams strengthened with carbon fiber reinforcedplastic laminates[J].Journal of Composite for Construc-tions,ASCE,2004,8(2):132-140.
[2]蒋隆敏,张毛心.国内外关于钢丝网水泥砂浆用于RC结构加固的研究[J].世界地震工程,2004,20(2):139-144.JIANG Long-min,ZHANG Mao-xin.Research on strengthen-ing methods of RC structure with ferrocement laminates athome and abroad[J].World Earthquake Engineering,2004,20(2):139-144.
[3]尚守平,曾令宏,彭晖,等.复合砂浆钢丝网加固RC受弯构件的试验研究[J].建筑结构学报,2003,24(6):87-91.SHANG Shou-ping,ZENG Ling-hong,PENG Hui,et al.Flexural behavior of reinforced concrete beams with ferroce-ment[J].Journal of Building Structures,2003,24(6):87-91.
[4]尚守平.高性能水泥复合砂浆钢筋网加固混凝土结构设计与施工指南[M].北京:中国建筑工业出版社,2008:5-17.SHANG Shou-ping.A guide for the design and construction ofRC structures strengthened with High Performance Ferroce-ment Laminate[M].Beijing:China Architecture&BuildingPress,2008:5-17.
[5]滕锦光,陈建飞,史密斯S T,等.FRP加固混凝土结构[M].北京:中国建筑工业出版社,2005.TENG Jin-guang,CHEN Jian-fei,Smith S T,et al.FRPstrengthened RC structures[M].Beijing:China Architecture&Building Press,2005.
[6]Barnes R A,Mays G C.Fatigue performance of concretebeams strengthened with CFRP plates[J].Journal of Com-posite for Constructions,ASCE,1999,3(2):63-72.
[7]Shahawy M,Beitelman T E.Static and fatigue performance ofRC beams strengthened with CFRP laminates[J].Journal ofStructure Engineering,ASCE,1999,125(6):613-621.
[8]刘沐宇,李开兵.碳纤维布加固混凝土梁的疲劳性能试验研究[J].土木工程学报,2005,38(9):32-36.LIU Mu-yu,LI Kai-bing.Fatigue performance of RC beamsstrengthened with CFRP sheets[J].China Civil EngineeringJournal,2005,38(9):32-36.
[9]尚守平,龙凌霄,曾令宏.销钉在钢筋网复合砂浆加固混凝土构件中的性能研究[J].建筑结构,2006,36(3):10-12.SHANG Shou-ping,LONG Ling-xiao,ZENG Ling-hong.Study of the pins in reinforced concrete beam strengthenedwith ferrocement[J].Building Structure,2006,36(3):10-12.
[10]Heffernan P J,Erki M A.Fatigue behavior of reinforcedconcrete beams strengthened with carbon fiber reinforcedplastic laminates[J].Journal of Composite for Construc-tions,ASCE,2004,8(2):132-140.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心