后张预应力加固砖砌体墙体抗震性能试验研究
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摘要
提出了采用后张预应力对砖砌体结构进行抗震加固的新技术,为验证加固效果,进行了8片采用后张预应力技术加固的砖砌体墙体在水平低周反复荷载下的试验研究。对比分析了未加固墙体与加固墙体的破坏形态和受力特点。试验结果表明,后张预应力加固砖砌体墙体可以显著提高墙体的抗震性能,加固后墙体的抗剪承载力提高幅度介于1.28~2.11倍之间,延性系数提高幅度介于1.33~3.8倍之间,墙体的破坏形态也明显改善。在试验研究的基础上,提出了后张预应力加固砖砌体墙体的施工工艺。
A new seismic retrofitting technology of using post-tensioning tendons to retrofit brick wall structures is presented.To verify the validity of the retrofitting technology,eight brick walls retrofitted with post-tensioned tendons are tested under lateral low-cyclic reversed load.Mechanical behaviors and failure modes of the seismically retrofitted brick walls using post-tensioning are compared with the non-retrofitted brick wall.It could be found that the seismic behaviors of the brick wall retrofitted using post-tensioned tendons could be significantly improved,with the in-plane shear strength of the post-tensioned brick walls ranging from 1.28 to 2.11 times and the ductility index ranging from 1.33 to 3.8 times,and the failure modes are also enhanced.The construction techniques and the posttensioned details are also introduced.
A new seismic retrofitting technology of using post-tensioning tendons to retrofit brick wall structures is presented.To verify the validity of the retrofitting technology,eight brick walls retrofitted with post-tensioned tendons are tested under lateral low-cyclic reversed load.Mechanical behaviors and failure modes of the seismically retrofitted brick walls using post-tensioning are compared with the non-retrofitted brick wall.It could be found that the seismic behaviors of the brick wall retrofitted using post-tensioned tendons could be significantly improved,with the in-plane shear strength of the post-tensioned brick walls ranging from 1.28 to 2.11 times and the ductility index ranging from 1.33 to 3.8 times,and the failure modes are also enhanced.The construction techniques and the posttensioned details are also introduced.
引文
[1]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,2012,43(1):49~52Liu Hang,Gao Hui-zong,Yang Xue-zhong,et al.External Post-tensioning Techniques and Applications forStructures Retrofitting[J].Architecture Technology,2012,43(1):49~52(in Chinese)
[2]刘航,杨学中.汶川大地震绵阳地区震害调查分析[A].第五届全国预应力结构理论与工程应用学术会议论文集[C].昆明,2008Liu Hang,Yang Xue-zhong.Investigation and Analysisof Earthquake Damages in Mianyang City during theWenchuan Earthquake[A].Proceedings of the the 5thNational Conference on Prestressed Structure Principlesand Applications[C],2008:463~467(in Chinese)
[3]Chuang S,Zhuge Y,McBean P C.Seismic Retrofittingof Unreinforced Masonry Walls by Cable System[A].13th World Conference on Earthquake Engineering[C].Vancouver,B.C.,Canada,August 1~6,2004
[4]Najif Ismail,Peter Laursen,Jason M Ingham.Out-of-plane Testing of Seismically Retrofitted URM Wallsusing Posttensioning[A].Proceedings of the AEESConference[C].Newcastle,Australia,11~13December 2009
[5]ElGawady M,Lestuzzi P,Badoux M.A Review ofConventional Seismic Retrofitting Techniques for URM[A].13th International Brick and Block MasonryConference Amsterdam[C].July 4~7,2004
[6]Nebojsa Mojsilovic,Peter Marti.Load Tests on Post-tensioned Masonry Walls[J].TMS Journal,2000,7
[2]刘航,杨学中.汶川大地震绵阳地区震害调查分析[A].第五届全国预应力结构理论与工程应用学术会议论文集[C].昆明,2008Liu Hang,Yang Xue-zhong.Investigation and Analysisof Earthquake Damages in Mianyang City during theWenchuan Earthquake[A].Proceedings of the the 5thNational Conference on Prestressed Structure Principlesand Applications[C],2008:463~467(in Chinese)
[3]Chuang S,Zhuge Y,McBean P C.Seismic Retrofittingof Unreinforced Masonry Walls by Cable System[A].13th World Conference on Earthquake Engineering[C].Vancouver,B.C.,Canada,August 1~6,2004
[4]Najif Ismail,Peter Laursen,Jason M Ingham.Out-of-plane Testing of Seismically Retrofitted URM Wallsusing Posttensioning[A].Proceedings of the AEESConference[C].Newcastle,Australia,11~13December 2009
[5]ElGawady M,Lestuzzi P,Badoux M.A Review ofConventional Seismic Retrofitting Techniques for URM[A].13th International Brick and Block MasonryConference Amsterdam[C].July 4~7,2004
[6]Nebojsa Mojsilovic,Peter Marti.Load Tests on Post-tensioned Masonry Walls[J].TMS Journal,2000,7
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