ECC面层加固空斗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)具有高强度、高延性和水硬过程中粘结性能良好,在砌体加固工程中具有广泛的应用前景。通过对2片未加固、2片单面和2片双面ECC面层加固后空斗墙进行水平拟静力试验,对比加固不同砌法下单面和双面空斗墙破坏模式、滞回曲线、刚度退化、承载能力和延性性能,进而研究ECC面层加固对墙体抗震性能的影响。利用ABAQUS有限元软件,采用预留孔洞的整体建模方式进行有限元分析,对比了试验值与计算值。结果表明:ECC面层与砖墙之间粘结较可靠,ECC面层优越的材料抗力可以抵抗墙体承担的水平剪力;单、双面ECC面层加固后空斗墙体极限变形能力及极限承载力均得到大幅提升,试件延性和抗震性能同步改善;有限元计算的水平承载力值与试验值相差不大。
With high strength, ductility and good bonding properties during the cement hydration process, high ductility fiber reinforced engineered cementitious composites(ECC) have a wide application prospect in masonry reinforcement engineering. The tests of two unreinforced cavity walls, two strengthening specimens with single ECC splint and two strengthening specimens with double ECC splints were conducted under in-plane cyclic loading. After the comparison of the failure mode, hysteretic curve, stiffness degradation, bearing capacity, and ductility of the single and double ECC splints strengthened cavity walls were analyzed to investigate seismic performance of strengthening ECC splint. The ABAQUS software was used to verify the test by comparing the experimental values and calculated values. The results show that the bonding properties between the ECC splint and the cavity wall are reliable, which illustrates that the superior material resistance can resist horizontal shear loads on cavity walls. The ultimate deformation and load bearing capacities of the single/double ECC splint strengthened cavity walls are largely improved, and the ductility and seismic performance of the strengthened specimens are also improved. The calculated horizontal shearing loads by the finite element analysis is almost matched with the experimental values.
With high strength, ductility and good bonding properties during the cement hydration process, high ductility fiber reinforced engineered cementitious composites(ECC) have a wide application prospect in masonry reinforcement engineering. The tests of two unreinforced cavity walls, two strengthening specimens with single ECC splint and two strengthening specimens with double ECC splints were conducted under in-plane cyclic loading. After the comparison of the failure mode, hysteretic curve, stiffness degradation, bearing capacity, and ductility of the single and double ECC splints strengthened cavity walls were analyzed to investigate seismic performance of strengthening ECC splint. The ABAQUS software was used to verify the test by comparing the experimental values and calculated values. The results show that the bonding properties between the ECC splint and the cavity wall are reliable, which illustrates that the superior material resistance can resist horizontal shear loads on cavity walls. The ultimate deformation and load bearing capacities of the single/double ECC splint strengthened cavity walls are largely improved, and the ductility and seismic performance of the strengthened specimens are also improved. The calculated horizontal shearing loads by the finite element analysis is almost matched with the experimental values.
引文
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[21] 方超.高延性纤维混凝土低矮剪力墙抗震性能试验研究[D] :西安建筑科技大学.2013.FANG Chao.Experimental study on seismic behavior of high ductility fibers concrete low-rise shear wall.[D]:Xi’an University of Architecture and Technology.2013.(in Chinese)
[22] 尚守平,雷敏.HPFL加固空斗墙抗震性能试验研究及有限元分析[J].地震工程与工程振动,2013,33(4):218-227.SHANG Shouping,LEI Min.Test study on seismic behavior and finite element analysis of row lock wall strength with HPFL[J].Journal of Earthquake Engineering and Engineering Vibration,2013,33(4):218-227.(in Chinese)
[23] 王卓琳,蒋利学.低强度空斗墙的受力性能试验研究[J].工业建筑,2011,41(增):87-92.WANG Zhuolin,JIANG Lixue,Experimental study on the mechanical performance of low strength cavity walls[J].Industrial Construction,2011,41(S):87-92.(in Chinese)
[2] 葛学礼,朱立新,赵小飞等.浙江文成地震村镇空斗墙建筑震害分析[J].工程抗震与加固改造.2006,28(6):106-109.GE Xueli,ZHU Lixin,ZHAO Xiaofei,et al.Earthquake damage analysis of building with cavity wall in Wencheng Earthquake[J].Earthquake Resistant Engineering and Retrofitting,2006,28(6):106-109.(in Chinese)
[3] 刘昌茂,冯卫,杨良荣.空斗墙房屋抗震性能及加固的试验研究[J],1990,2:10-15.LIU Changmao,FENG Wei,YANG Liangrong.Experimental test on the seismic behavior of cavity wall[J],1990,2:10-15.(in Chinese)
[4] 尚卿,刘沩.农村砖砌空斗墙建筑的抗震加固[J].广西大学学报自然科学版,2009,34(5):603-608.SHANG Qing,LIU Wei.Anti-seismic strengthening of masonry cavity wall building of masonry in rural area[J].Journal of Guangxi University.Nat Sci Ed,2009,34(5):603-608.(in Chinese)
[5] 尚守平,姚菲,刘可,等.一种适用于农村居民的抗震实用技术[J].工程力学,2009,26(增2):168-174.SHANG Shouping,YAO Fei,LIU Ke,et al.A practical technology for seismic resistance of rural residence[J].Engineering Mechanics,2009,26(S2):168-174.(in Chinese)
[6] 王卓琳,将利学.碳纤维布加固低强度空斗墙试验研究[J].施工技术,2013,42(16):8-11.WANG Zhuolin,JIANG Lixue.Experimental study of low strength cavity walls strengthened with CFRP[J].Construction Technology,2013,42(16):8-11.(in Chinese)
[7] 王卓琳,将利学.高强钢绞线-聚合物砂浆加固低强度空斗墙的试验研究[J].工业建筑,2011,41(11):60-65.WANG Zhuolin,JIANG Lixue.Experimental study on low strength cavity walls strengthened with high strength steel wire and polymer mortar[J].Industrial Construction,2011,41(11):60-65.(in Chinese)
[8] BILLINGTON SL,KYRIAKIDES MA,BLACKARD B,et al.Evaluation of a sprayable ductile cement-based composite for the seismic retrofit of unreinforced masonary infills [C].San Francisco,Caliafomia:AIC&SEI Conference on the Improving the Seismic Performance of Existing Buildings and Other Structures,2009:823-834.
[9] LI Xiuling,WANG Juan,BAO Yi,et al.Cyclic behavior of damaged reinforced concrete column repaired with high-performance fiber-reinforced cementitious composite[J].Engineering Structures,2017,136:26-35.
[10] MAALEJ M,LIN VWJ,NGUYEN MP,et al.Enginnered cementitous composites for effective strengthening of unreinforced masonary walls[J].Engineering Structures,2010,32:2432-2439.
[11] LIN Yiwei,LIAM Wotherspoon,ALLAN Scott,et al.In-plane strengthening of clay brick unreinforced masonary wallettes using ECC shotcrete[J].Engineering structures,2014,66(2014):57-65.
[12] AYOUB Dehghani,FARIBORZ Nateghi-Alahi,GREGOR Fischer.Engineered cementitious composites for strengthening masonry infilled reinforced concrete frames,2015,105:197-208.
[13] 张远淼,应付钊,余江滔,等.ECC修复震损剪力墙抗震性能试验研究[J].工程力学,2015,32(1):72-80.ZHANG Yuanmiao,YING Fuzhao,YU Jiangtao,et al.Experimental test on aseismic behavior of damaged reinforced concrete shear wall repaired with ECC[J].Engineering Mechanics,2015,32(1):72-80.(in Chinese)
[14] 邓明科,高晓军,梁兴文.ECC面层加固砖墙抗震性能试验研究[J].工程力学,2013,30(6):168-174.DENG Mingke,GAO Xiaojun,LIANG Xingwen.Experimental investigation on aseismic behavior of brick wall strengthened with ECC splint[J].Engineering Mechanics,2013,30(6):168-174.(in Chinese)
[15] 邓明科,樊鑫淼,高晓军,等.ECC面层加固受损砖砌体墙抗震性能试验研究[J],工程力学.2015,32(4):120-129.DENG Mingke,FAN Xinmiao,GAO Xiaojun,et al.Experimental investigation on the seismic behavior of damage brick masonry wall strengthened with ECC splint[J].Engineering Mechanics,2015,32(4):120-129.(in Chinese)
[16] 熊峰.非线性有限元分析预应力砌体墙结构[J].四川大学学报,2000,32(3):16-19.XIONG Feng,YING Fuzhao.Non-linear analysis of prestressed masonry by finite element method[J].2000,32(3):16-19.(in Chinese)
[17] 刘杰.基于ABAQUS整体式模型下砌体结构抗震性能影响因素研究[D].长沙:湖南大学.2014.LIU Jie.Research on factors influencing seismic performance of masonry structure based on the integral model of ABAQUS [D].Changsha:Hunan University.2014.(in Chinese)
[18] 混凝土结构设计规范 (GB 50010-2010) [S].北京:中国建筑工业出版社.2015.Code for Seismic Design of Buildings (GB 50010-2010) [S].Beijing:China Architecture& Building Press.2015.(in Chinese)
[19] 砌体结构设计规范 (GB50003-2011) [S].中国建筑工业出版社.2012.Code for Design of Masonry Structures (GB 50003-2010) [S].China Architecture& Building Press 2012.(in Chinese)
[20] 李艳.高性能纤维增强水泥基复合材料力学性能研究[D].西安:西安建筑科技大学,2011.LI Yan.Study on mechanical performance of high performance fiber reinforced cement composite [D].Xi′an:Xi′an University of Architecture and Technology,2011:78―120.(in Chinese)
[21] 方超.高延性纤维混凝土低矮剪力墙抗震性能试验研究[D] :西安建筑科技大学.2013.FANG Chao.Experimental study on seismic behavior of high ductility fibers concrete low-rise shear wall.[D]:Xi’an University of Architecture and Technology.2013.(in Chinese)
[22] 尚守平,雷敏.HPFL加固空斗墙抗震性能试验研究及有限元分析[J].地震工程与工程振动,2013,33(4):218-227.SHANG Shouping,LEI Min.Test study on seismic behavior and finite element analysis of row lock wall strength with HPFL[J].Journal of Earthquake Engineering and Engineering Vibration,2013,33(4):218-227.(in Chinese)
[23] 王卓琳,蒋利学.低强度空斗墙的受力性能试验研究[J].工业建筑,2011,41(增):87-92.WANG Zhuolin,JIANG Lixue,Experimental study on the mechanical performance of low strength cavity walls[J].Industrial Construction,2011,41(S):87-92.(in Chinese)