斜向粘贴FRP加固砖砌体墙受剪试验
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摘要
目的研究FRP加固砖砌体墙平面内的抗震受力性能,提出FRP加固砖砌体墙的力学计算模型.方法对5片相同截面不同FRP加固量和不同FRP加固材料的墙片进行平面内低周反复加载对比试验.结果试验研究表明,45°斜向粘贴FRP布加固墙体的荷载(开裂荷载、峰值荷载和极值荷载)较未加固墙体提高1.5%~19.3%,加固墙体的变形能力提高更加显著,提高率为18.2%~250.0%;FRP粘贴于砌体表面不仅可以直接参与墙体受剪作用,更能够通过间接加固作用提高砌体自身抗剪能力,改变剪切破坏类型,提高砌体墙的抗剪承载力.结论采用45°斜向粘贴FRP布加固砖砌体墙能显著提高墙片的抗剪承载力和抗震受力性能,提出了FRP加固砖砌体墙抗剪承载力简化计算方法.
The paper studies the in-plane seismic property of FRP strengthened masonry wall,putting forward the mechanics model of FRP strengthened masonry wall.Conducting in-plane low cyclic loading tests for 5 wall with the same cross sections,different amount of FRP and different FRP materials.The bearing loads(cracking load,maximum load and limit load) of the wall strengthened with FRP in 45° direction increased 1.5%～19.3% than un-strengthened wall.The deforming ability of strengthened wall increased 18.2%～250.0% than that of un-strengthened wall;FRP adhesion on the surface of wall not only joins the wall to bear shear action,but also raises the bearing capacity of the wall and changes shear failure mode.Using FRP to strengthen masonry wall can raise shear bearing capacity and seismic property of the wall,and simplified formula of shear bearing capacity of masonry wall is put forward.
The paper studies the in-plane seismic property of FRP strengthened masonry wall,putting forward the mechanics model of FRP strengthened masonry wall.Conducting in-plane low cyclic loading tests for 5 wall with the same cross sections,different amount of FRP and different FRP materials.The bearing loads(cracking load,maximum load and limit load) of the wall strengthened with FRP in 45° direction increased 1.5%～19.3% than un-strengthened wall.The deforming ability of strengthened wall increased 18.2%～250.0% than that of un-strengthened wall;FRP adhesion on the surface of wall not only joins the wall to bear shear action,but also raises the bearing capacity of the wall and changes shear failure mode.Using FRP to strengthen masonry wall can raise shear bearing capacity and seismic property of the wall,and simplified formula of shear bearing capacity of masonry wall is put forward.
引文
[1]ACI Committee 440.Guide for the design and con-struction of externally bonded FRP systems forstrengthening concrete structures[M].Detroit:Amer-ican Concrete Institute,2000.
[2]Quantrill R J,Hollawayl G,Thorne A M.Experimen-tal and analytical investigation of FRP strengthenedbeam response:part I[J].Magazine of Concrete Re-search,1996,48(12):331-342.
[3]Rahimi H,Hutchinson A.Concrete beams strength-ened with externally bonded FRP plates[J].Journalof Composites for Construction,ASCE,2001,5(1):44-56.
[4]张祥顺,谷倩,管克俭.碳纤维布加固砌体结构试验研究[J],武汉理工大学学报,2002,24(11):29-32.
[5]赵彤、张晨军、谢剑,等.碳纤维布用于砖砌体抗震加固的试验研究[J].地震工程与工程振动,2001,21(2):89-95.
[6]Laursen P T,Seible F,Hegemier G A.Seismic retrofitand repair of masonry walls with carbon overlays[J].Non-metallic(FRP)Reinforcement for ConcreteStructures,RILEM,1995,35(5):616-627.
[7]林磊,叶列平.FRP加固砖砌体墙的试验研究与分析[J].建筑结构,2005,35(3):21-27.
[8]Triantafillou T C.Strengthening of masonry struc-tures using epoxy-bonded FRP laminates[J].Jour-nal of Composites for Construction,1998,2(2):96-103
[9]骆万康,朱希诚,廖春盛.砌体抗剪强度研究的回顾与新的计算方法[J].重庆建筑大学学报,1995,(4):51-56.
[10]柳学花.纤维增强复合材料加固砖砌体抗震性能研究[D].长安:长安大学土木学院,2005.
[2]Quantrill R J,Hollawayl G,Thorne A M.Experimen-tal and analytical investigation of FRP strengthenedbeam response:part I[J].Magazine of Concrete Re-search,1996,48(12):331-342.
[3]Rahimi H,Hutchinson A.Concrete beams strength-ened with externally bonded FRP plates[J].Journalof Composites for Construction,ASCE,2001,5(1):44-56.
[4]张祥顺,谷倩,管克俭.碳纤维布加固砌体结构试验研究[J],武汉理工大学学报,2002,24(11):29-32.
[5]赵彤、张晨军、谢剑,等.碳纤维布用于砖砌体抗震加固的试验研究[J].地震工程与工程振动,2001,21(2):89-95.
[6]Laursen P T,Seible F,Hegemier G A.Seismic retrofitand repair of masonry walls with carbon overlays[J].Non-metallic(FRP)Reinforcement for ConcreteStructures,RILEM,1995,35(5):616-627.
[7]林磊,叶列平.FRP加固砖砌体墙的试验研究与分析[J].建筑结构,2005,35(3):21-27.
[8]Triantafillou T C.Strengthening of masonry struc-tures using epoxy-bonded FRP laminates[J].Jour-nal of Composites for Construction,1998,2(2):96-103
[9]骆万康,朱希诚,廖春盛.砌体抗剪强度研究的回顾与新的计算方法[J].重庆建筑大学学报,1995,(4):51-56.
[10]柳学花.纤维增强复合材料加固砖砌体抗震性能研究[D].长安:长安大学土木学院,2005.
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