ECC面层加固砖墙抗震性能试验研究
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摘要
高延性纤维增强水泥基复合材料(ECC)是一种高强度、高韧性的生态建筑材料,在土木工程领域具有广泛的应用前景。为充分发挥ECC的韧性和良好的抗剪性能,该文提出一种采用ECC面层加固砖墙的方法,对2片未加固砖墙和2片ECC面层加固的砖墙进行了拟静力试验。试验结果表明:ECC面层与砖墙具有良好的粘结性能,采用ECC面层加固砖墙能有效限制墙体的开裂和破坏,提高砖砌体墙的延性和耗能能力,改善砖墙的剪切脆性破坏模式,提高墙体的损伤容限,减小砌体结构的震后加固费用。
The engineered cementitious composite(ECC) is one of high strength,high toughness of ecological building materials,and it has broad application prospects in civil engineering.To develop the toughness and shear capacity of ECC,a new technique is proposed for strengthening brick walls with ECC splint.Two unreinforced brick walls and two brick walls with ECC splint were designed and the quasi-static tests were carried out.The results showed that: the bonding properties between the ECC splint and the brick wall are good.The ECC splint of strengthened brick walls can effectively limit the cracking and damage of the wall,and improve the ductility and energy dissipation capacity as well as the damage tolerance of the wall.It can also improve the brittle shear failure modes of brick wall and reduce the post-earthquake retrofit costs of masonry structures.
The engineered cementitious composite(ECC) is one of high strength,high toughness of ecological building materials,and it has broad application prospects in civil engineering.To develop the toughness and shear capacity of ECC,a new technique is proposed for strengthening brick walls with ECC splint.Two unreinforced brick walls and two brick walls with ECC splint were designed and the quasi-static tests were carried out.The results showed that: the bonding properties between the ECC splint and the brick wall are good.The ECC splint of strengthened brick walls can effectively limit the cracking and damage of the wall,and improve the ductility and energy dissipation capacity as well as the damage tolerance of the wall.It can also improve the brittle shear failure modes of brick wall and reduce the post-earthquake retrofit costs of masonry structures.
引文
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[2]JGJ116-2009,建筑抗震加固技术规程[S].北京:中国建筑工业出版社,2009.JGJ 116-2009,Technical specification for seismicstrengthening of building[S].Beijing:ChinaArchitecture Industry Press,2009.(in Chinese)
[3]徐世烺,李贺东.超高韧性水泥基复合材料研究进展及其工程应用[J].土木工程学报,2008,41(6):45―60.Xu Shilang,Li Hedong.A review on the development ofresearch and application of ultra high toughnesscementitious composites[J].China Civil EngineeringJournal,2008,41(6):45―60.(in Chinese)
[4]Li V C.On Engineered cementitious composites(ECC)[J].Journal of Advanced Concrete Technology,2003,1(3):215―230.
[5]Billington S L.Damage-tolerant cement-based materialsfor performance based earthquake engineering design:research needs[C].Colorado,USA:Proceedings of theFifth International Conference on Fracture Mechanics ofConcrete and Concrete Structures(FraMCoS-5),2004:53―60.
[6]Fischer G,Li V C.Effect of matrix ductility ondeformation behavior of steel reinforced ECC flexuralmembers under reversed cyclic loading conditions[J].ACI Structural Journal,2002,99(6):781―790.
[7]Li V C,Mishra D K,Naaman A E,et al.On the shearbehavior of ECC[J].J Advance Cement Based Mater,1994,1(3):142―1491.
[8]Kabele P,Li V C,Horii H,et al.Use of BMC for ductilestructural members[C].Warsaw,Poland:In Proceedingof 5th International Symposium on Brittle MatrixComposites(BMC-5),1997:579―588.
[9]Fischer G,Li V C.Influence of matrix ductility on thetension-stiffening behavior of steel reinforced ECC[J].ACI Structural Journal,2002,99(1):104―111.
[10]Matsumoto T,Suthiwarapirak P,Kanda T.Mechanism ofmultiple cracking and fracture of DFRCCs under failureflexure[J].Journal of Advanced Technology,2003,1(3):299―306.
[11]Kanda T,Watanabe S,Li V C.Application of pseudostrain hardening cementitious composites to shearresistant structural elements[C].D-79104 Freiburg,Germany:In Fracture Mechanics of Concrete StructuresProceeding of FRAMCOS-3,AEDIFI CATIO Publishers,1998:1477―1490.
[12]Maalej M,Zhang J,Quek S T,et al.High-velocity impactresistance of hybrid-fiber engineered cementitiouscomposites[C].Vail,Colorado,USA:Proceedings of theFifth International Conference on Fracture Mechanics ofConcrete and Concrete Structures(FraMCoS-5),2004:1051―1058.
[13]Billington S L,Kyriakides M A,Blackard B,et al.Evaluation of a sprayable,ductile cement-basedcomposite for the seismic retrofit of unreinforcedmasonry infills[C].San Francisco,California:AIC&SEI Conference on Improving the Seismic Performanceof Existing Buildings and Other Structures,2009:823―834.
[14]徐世烺,王楠,尹世平.超高韧性水泥基复合材料加固钢筋混凝土梁弯曲控裂试验研究[J].建筑结构学报,2011,32(9):115―122.Xu Shilang,Wang Nan,Ying Shiping.Experimentalstudy on flexural characteristics of RC beamsstrengthened with post-poured ultra high toughnesscementitious composites[J].Journal of BuildingStructures,2011,32(9):115―122.(in Chinese)
[15]梁兴文,郑雨,邓明科,寇佳亮,车佳玲.塑性铰区采用纤维增强混凝土剪力墙的变形性能研究[J].工程力学,2013,30(3):256―262.Liang Xingwen,Zheng Yu,Deng Mingke,Kou Jialiang,Che Jialing.An investigation of deformation behavior ofthe shear wall with fiber-reinforced concrete in plastichigh region[J].Engineering Mechanics,2013,30(3):256―262.(in Chinese)
[16]李艳,梁兴文.PVA-ECC纤维增强水泥基复合材料:性能与设计[J].混凝土,2009,242(12):54―57.Li Yan,Liang Xingwen.PVA fiber reinforcedcementitious composites:Performance and design[J].Concrete,2009,242(12):54―57.(in Chinese)
[17]JGJ101-96,建筑抗震试验方法规程[S].北京:中国建筑工业出版社,1997.JGJ 101-96,Specification of testing methods forearthquake resistant building[S].Beijing:ChinaArchitecture Industry Press,1997.(in Chinese)
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