钢绞线(丝)网-聚合砂浆加固钢筋混凝土梁受弯性能研究
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摘要
钢绞线(丝)网-聚合砂浆加固技术是一项新型加固工艺,具有耐火、耐腐蚀、耐老化、施工速度快等优点,已被逐渐应用于钢筋混凝土结构的加固补强中。采用该技术抗弯加固钢筋混凝土梁的受力性能可分为三个阶段:未裂阶段、裂缝阶段和破坏阶段。已有研究多数集中于加固混凝土梁正常使用阶段的抗弯性能分析,对受力纵筋屈服后破坏阶段的抗弯性能分析则鲜有涉及。该文在以往试验研究的基础上,采用换算截面法计算加固钢筋混凝土梁屈服阶段和极限阶段的等效刚度,对加固梁在集中荷载作用下抗弯性能全过程进行受力分析,并通过10根加固梁的试验数据对其验证,吻合良好。
Rehabilitation of reinforced concrete members with steel wire mesh and polymer mortar is a new method of structural strengthening with the advantages of resistance to fire,corrosion,ageing,and rapid construction speed.This new technique has been gradually applied in the strengthening of reinforced concrete structures.Existing test results indicated that the overall flexural behaviour of reinforced concrete beams strengthened with steel wire mesh and polymer mortar can be divided into three stages: precracking stage,cracking stage,and failure stage.The research conducted so far on the flexural rehabilitation of virgin RC beams in failure stage beyond the steel bar yield by using steel wire mesh composites is quite limited and of a preliminary and exploratory character,while the flexural behaviour of RC beams strengthened by steel wire mesh composites in the serviceability limit stage is rather extensive.Based on existing test results,a moment deflection model is developed by using a transformed section approach.The flexural behaviour of the strengthened specimens subjected to a four-point bending test was addressed.The suggested model was verified using the test data of 10 strengthened beams,and a good agreement between experiment and prediction values is achieved.
Rehabilitation of reinforced concrete members with steel wire mesh and polymer mortar is a new method of structural strengthening with the advantages of resistance to fire,corrosion,ageing,and rapid construction speed.This new technique has been gradually applied in the strengthening of reinforced concrete structures.Existing test results indicated that the overall flexural behaviour of reinforced concrete beams strengthened with steel wire mesh and polymer mortar can be divided into three stages: precracking stage,cracking stage,and failure stage.The research conducted so far on the flexural rehabilitation of virgin RC beams in failure stage beyond the steel bar yield by using steel wire mesh composites is quite limited and of a preliminary and exploratory character,while the flexural behaviour of RC beams strengthened by steel wire mesh composites in the serviceability limit stage is rather extensive.Based on existing test results,a moment deflection model is developed by using a transformed section approach.The flexural behaviour of the strengthened specimens subjected to a four-point bending test was addressed.The suggested model was verified using the test data of 10 strengthened beams,and a good agreement between experiment and prediction values is achieved.
引文
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[2]Xing Guohua,Wu Tao,Liu Boquan,et al.Experimentalinvestigation of reinforced concrete t-beams strengthenedwith steel wire mesh embedded in polymer mortaroverlay[J].Advances in Structural Engineering,2010,13(1):69―79.
[3]卜良桃,胡尚瑜,叶蓁.复合砂浆钢筋网加固RC足尺梁受弯试验研究[J].重庆建筑大学学报,2007,29(3):51―56.Bu Liangtao,Hu Shangyu,Ye Zhen.Experimental studyon flexural behavior of reinforced concrete beamsstrengthened with ferrocement mortar[J].Journal ofChongqing Jianzhu University,2007,29(3):51―56.(inChinese)
[4]卜良桃,王月红,尚守平.复合砂浆钢筋网加固抗弯RC梁的非线性分析[J].工程力学,2006,23(9):125―130.Bu Liangtao,Wang Yuehong,Shang Shouping.Nonlinear FEM analysis of RC beam strengthened withferrocement mortar[J].Engineering Mechanics,2006,23(9):125―130.(in Chinese)
[5]邢国华,刘伯权,吴涛,等.钢绞线(丝)网-聚合砂浆加固混凝土梁的变形计算[J].西安建筑科技大学学报(自然科学版),2009,41(3):358―362.Xing Guohua,Liu Boquan,Wu Tao,et al.Deflectioncalculation of reinforced concrete beam strengthenedwith steel wire mesh and polymer mortar[J].J.Xi’anUniv.of Arch.&Tech.(Natural Science Edition),2009,41(3):358―362.(in Chinese)
[6]叶列平,陆新征,马千里,等.屈服后刚度对建筑结构地震响应影响的研究[J].建筑结构学报,2009,30(4):17―29.Ye Lieping,Lu Xinzheng,Ma Qianli,et al.Influence ofpost-yielding stiffness to seismic response of buildingstructures[J].Journal of Building Structures,2009,30(4):17―29.(in Chinese)
[7]刘伯权,赖明,杨红.多层建筑考虑低周疲劳特性的地震倒塌反应分析[J].地震工程与工程振动,1994,14(2):86―93.Liu Boquan,Lai Ming,Yang Hong.Analysis of collapseearthquake responses of multi-story buildings takingaccount of structural low-cycle fatigue character[J].Earthquake Engineering and Engineering Vibration,1994,14(2):86―93.(in Chinese)
[8]卜良桃.高性能复合砂浆钢筋网加固RC梁的性能研究[D].长沙:湖南大学,2006.Bu Liangtao.Research on the performance of the RCbeams strengthened with high performance ferrocement[D].Changsha:Hunan University,2006.(in Chinese)
[9]中华人民共和国国家标准.GB50367-2006混凝土结构加固设计规范[S].北京:中国建筑工业出版社,2006.National Standard of the People’s Republic of China.GB50367-2006 Design code for strengthening concretestructure[S].Beijing:China Architectural&BuildingPress,2006.(in Chinese)
[10]ACI Committee 440.State of the art report on fiberreinforced plastic reinforcement for concrete structures.[S].American Concrete Institute,Detroit,Michigan,1996.
[11]帕克R,波利T.钢筋混凝土结构[M].秦文钺,等,译.重庆:重庆大学出版社,1986.Park R,Paulay T.Reinforced Concrete Structures[M].Translated by Qin Wenyue.Chongqing:ChongqingUniversity Press,1986.(in Chinese)
[12]曾令宏.高性能复合砂浆钢筋(丝)网加固混凝土梁试验研究和理论分析[D].长沙:湖南大学,2006.Zeng Linghong.Experimental study and theoreticalanalysis on strengthening reinforced concrete beams withhigh performance ferrocement[D].Changsha:HunanUniversity,2006.(in Chinese)
[13]戴睿.钢丝筋网复合砂浆加固混凝土梁的受弯试验研究[D].长沙:湖南大学,2004.Dai Rui.Experimental study on flexural behavior ofreinforced concrete beams strengthened with ferrocement[D].Changsha:Hunan University,2004.(in Chinese)
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