后张预应力加固无构造柱砌体墙抗震性能试验
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摘要
砌体结构的抗压强度远大于抗拉、抗剪强度,适合应用于受压为主的构件。由于其具有自重大,材料呈脆性,抗拉、抗剪、抗弯能力低等缺点,使得其抗震性能较差。针对农村地区砖砌体结构房屋抗震加固改造工程量大面广,所需资金缺口大、来源匮乏的现状,充分发挥后张预应力技术的优势,提出一种适用于既有砌体结构的新型抗震加固技术。在此基础上,通过5片构件(1片未加固墙片和4片加固墙片)抗震加固实验验证了此新型抗震加固方法的有效性和优越性。试验结果表明,与相同设计的未加固墙体相比,后张预应力加固无构造柱砖砌体墙体的抗剪承载力、变形能力和耗能能力均有大幅度提高,提高幅度高于2倍。该后张预应力加固既有砌体结构新技术具有施工简便、质量容易控制、工期较短、对结构影响小、造价低廉等优点,具有广阔的应用前景。
In this paper,to solve problem of seismic retrofitting wide for existing brick masonry in the rural area,a novel seismic strengthening technology is proposed based on the advantage of post-tension technology. And the test results on 5 no structural columns clay brick shear walls retrofitted using post-tensioned tendons and subjected to quasi-static reversed cyclic loadings. One wall was built as a non-retrofitted wall,and the remaining four were retrofitted using post-tensioned high strength steel strands. Test results indicated that the mechanical behaviors and the failure patterns of the retrofitted walls could be significantly improved. The in-plane shear strength of the post-tensioned brick walls observed could be range above two times the strength of the non-retrofitted wall. The proposed seismic retrofitting technology have the advantages of simple construction,easy to control quality,short time to build,small influence on the existing structure,low cost and so on.
In this paper,to solve problem of seismic retrofitting wide for existing brick masonry in the rural area,a novel seismic strengthening technology is proposed based on the advantage of post-tension technology. And the test results on 5 no structural columns clay brick shear walls retrofitted using post-tensioned tendons and subjected to quasi-static reversed cyclic loadings. One wall was built as a non-retrofitted wall,and the remaining four were retrofitted using post-tensioned high strength steel strands. Test results indicated that the mechanical behaviors and the failure patterns of the retrofitted walls could be significantly improved. The in-plane shear strength of the post-tensioned brick walls observed could be range above two times the strength of the non-retrofitted wall. The proposed seismic retrofitting technology have the advantages of simple construction,easy to control quality,short time to build,small influence on the existing structure,low cost and so on.
引文
[1]杨丽辉.砖砌体民居抗震性能试验研究与连续倒塌数值分析[D].北京:北京交通大学,2011:12-17.YANG Lihui.Experimental study on the seismic performance of brick masonry residence and continuous collapse numerical analysis[D].Beijing:Beijing Jiaotong University,2011:12-17(in Chinese)
[2]程耿东,李刚.基于功能性的结构抗震设计中一些问题的探讨[J].建筑结构学报,2000,21(1):1-8.CHENG Gendong,LI Gang.Discussion on some problems of aseismic structures based on functional design[J].Journal of Building Structures,2000,21(1):1-8.(in Chinese)
[3]清华大学,西南交通大学,北京交通大学土木工程结构专家组.汶川地震建筑震害分析[J].建筑结构学报,2008,29(4):1-9.Experts in civil engineering structure.Analysis on building seismic damage in Wenchuan earthquake[J].Journal of building structures,2008,29(4):1-9.(in Chinese)
[4]中国建筑科学研究院.2008年汶川地震建筑震害图片集[M].北京:中国建筑工业出版社,2008.China Academy of Building Research.Photos album of building damage in 2008 Wenchua earthquake[M].Beijing:China Architecture&Building Press,2008.(in Chinese)
[5]Abdullah Katsuki T..Shear strengthening of reinforced concrete columns using ferrocement jackets[J].ACI Structural journal,2001,98(5):696-704.
[6]Ye L.P.,Zhang K.,Zhao S.H.,et al.Experimental study on seismic strengthening of RC columns with wrapped CFRP sheets[J].Construction and Building Materials,2003,17(5):499-506.
[7]Bruce R.Ellinwood.Earthquake risk assessment of building structures[J].Reliability Engineering and System Safety,2001,74:251-261.
[8]刘航,高会宗,杨学中,等.后张体外预应力加固技术及其工程应用[J].建筑技术,2012(1):18-22.LIU Hang,GAO Huizong,YANG Xuezhong et al.Post-tensioned external prestressed reinforcement technology and its application[J].Journal of construction technology,2012(1):18-22(in Chinese)
[9]刘航,杨学中.汶川大地震绵阳地区震害调查分析[J].建筑技术开发,2008(S1):189-193.LIU Hang,YANG Xuezhong.Analysis of disasters in Mianyang area in Wenchuan earthquake[J].Building Technique Development,2008(S1):189-193(in Chinese)
[10]S.Chuang,Y.Zhuge,P.C.Mc Bean,Seismic retrofitting of unreinforced masonry walls by cable system[C]//13th World Conference on Earthquake Engineering,Vancouver,B.C.,Canada,August 1-6,2004
[11]Najif Ismail,Peter Laursen,Jason M.Ingham,Out-of-plane testing of seismically retrofitted URM walls using posttensioning[C]//Proceedings of The AEES Conference,Newcastle,Australia,11-13 December 2009.
[12]M.El Gawady,P.Lestuzzi,M.Badoux,A review of conventional seisnic retrofitting techniques for urm[C]//13th International Brick and Block Masonry Conference Amsterdam,July 4-7,2004.
[13]Nebojsa Mojsilovic,Peter Marti.Load tests on post-tensioned masonry walls[J].TMS Journal,July 2000.
[2]程耿东,李刚.基于功能性的结构抗震设计中一些问题的探讨[J].建筑结构学报,2000,21(1):1-8.CHENG Gendong,LI Gang.Discussion on some problems of aseismic structures based on functional design[J].Journal of Building Structures,2000,21(1):1-8.(in Chinese)
[3]清华大学,西南交通大学,北京交通大学土木工程结构专家组.汶川地震建筑震害分析[J].建筑结构学报,2008,29(4):1-9.Experts in civil engineering structure.Analysis on building seismic damage in Wenchuan earthquake[J].Journal of building structures,2008,29(4):1-9.(in Chinese)
[4]中国建筑科学研究院.2008年汶川地震建筑震害图片集[M].北京:中国建筑工业出版社,2008.China Academy of Building Research.Photos album of building damage in 2008 Wenchua earthquake[M].Beijing:China Architecture&Building Press,2008.(in Chinese)
[5]Abdullah Katsuki T..Shear strengthening of reinforced concrete columns using ferrocement jackets[J].ACI Structural journal,2001,98(5):696-704.
[6]Ye L.P.,Zhang K.,Zhao S.H.,et al.Experimental study on seismic strengthening of RC columns with wrapped CFRP sheets[J].Construction and Building Materials,2003,17(5):499-506.
[7]Bruce R.Ellinwood.Earthquake risk assessment of building structures[J].Reliability Engineering and System Safety,2001,74:251-261.
[8]刘航,高会宗,杨学中,等.后张体外预应力加固技术及其工程应用[J].建筑技术,2012(1):18-22.LIU Hang,GAO Huizong,YANG Xuezhong et al.Post-tensioned external prestressed reinforcement technology and its application[J].Journal of construction technology,2012(1):18-22(in Chinese)
[9]刘航,杨学中.汶川大地震绵阳地区震害调查分析[J].建筑技术开发,2008(S1):189-193.LIU Hang,YANG Xuezhong.Analysis of disasters in Mianyang area in Wenchuan earthquake[J].Building Technique Development,2008(S1):189-193(in Chinese)
[10]S.Chuang,Y.Zhuge,P.C.Mc Bean,Seismic retrofitting of unreinforced masonry walls by cable system[C]//13th World Conference on Earthquake Engineering,Vancouver,B.C.,Canada,August 1-6,2004
[11]Najif Ismail,Peter Laursen,Jason M.Ingham,Out-of-plane testing of seismically retrofitted URM walls using posttensioning[C]//Proceedings of The AEES Conference,Newcastle,Australia,11-13 December 2009.
[12]M.El Gawady,P.Lestuzzi,M.Badoux,A review of conventional seisnic retrofitting techniques for urm[C]//13th International Brick and Block Masonry Conference Amsterdam,July 4-7,2004.
[13]Nebojsa Mojsilovic,Peter Marti.Load tests on post-tensioned masonry walls[J].TMS Journal,July 2000.
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