玄武岩纤维加固震损砌体结构振动台试验研究
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摘要
地震震害调查表明,砌体结构因抗震性能较差,在地震中更易遭受破坏。玄武岩纤维(BFRP)具有良好的物理、力学性能,且价格低廉,但其在震后受损结构加固中却未得到广泛使用。通过对一栋缩尺比为1∶4的三层砌体结构模型预震损及其震损后玄武岩纤维加固的两次振动台试验,对比分析了两次模型试验的动力特性、地震反应和损伤破坏情况,旨在验证玄武岩纤维加固震损砌体的有效性。试验结果表明,玄武岩纤维加固法可以改善砌体的脆性,延缓墙体裂缝的发展,提高结构的整体性和整体刚度,改善结构的耗能能力,使震损加固砌体结构达到甚至超过未震损结构的抗震性能,且不改变原结构质量,是一种非常有效的震损砌体结构加固方法。
The earthquake investigation shows that masonry buildings are prone to severe damage or even collapse due to their seismic vulnerability.BFRP has excellent physical and mechanical properties as well as the advantage of low cost,but it has not yet been widely used in the strengthening of earthquake-damaged structures.Based on the shaking table tests of a pre-damaged model(1∶ 4 scaled three-storeyed masonry structure model) and an earthquake-damaged model strengthened with BFRP,the validity of strengthening with BFRP on earthquake-damaged masonry structures was verified by analyzing comparatively the dynamic characteristics,seismic response and damage of models in either test.The experimental results show that this strengthening technique can not only ameliorate the brittleness of masonry and delay the crack development in the wall without the change of structural weight,but also increase the structural integrity and stiffness and improve the ductility and the energy dissipation capacity.The seismic performance of earthquake-damaged masonry structure after reinforcement can reach or even exceed that of the undamaged structure,which proves the high effectivness of strengthening with BFRP on earthquake-damaged masonry structures.
The earthquake investigation shows that masonry buildings are prone to severe damage or even collapse due to their seismic vulnerability.BFRP has excellent physical and mechanical properties as well as the advantage of low cost,but it has not yet been widely used in the strengthening of earthquake-damaged structures.Based on the shaking table tests of a pre-damaged model(1∶ 4 scaled three-storeyed masonry structure model) and an earthquake-damaged model strengthened with BFRP,the validity of strengthening with BFRP on earthquake-damaged masonry structures was verified by analyzing comparatively the dynamic characteristics,seismic response and damage of models in either test.The experimental results show that this strengthening technique can not only ameliorate the brittleness of masonry and delay the crack development in the wall without the change of structural weight,but also increase the structural integrity and stiffness and improve the ductility and the energy dissipation capacity.The seismic performance of earthquake-damaged masonry structure after reinforcement can reach or even exceed that of the undamaged structure,which proves the high effectivness of strengthening with BFRP on earthquake-damaged masonry structures.
引文
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[2]李琪琪.压力灌浆法在低层砖混结构中的加固处理应用[J].赤峰学院学报,2010,26(3):132-133.LI Qi-qi.Application of reinforcement using pressure grouting method in low-lever brick and concrete structure[J].Journal of Chifeng University,2010,26(3):132-133.
[3]古倩,彭波,翁锐.喷射GFRP抗压加固砖砌体的受压承载力分析[J].华南理工大学学报,2011,39(4):140-148.GU Qiang,PENG Bo,WENG Rui.Analysis of compressive capacity of brick masonry compressively strengthened with sprayed GFRP[J].Journal of South China University of Technology,2011,39(4):140-148.
[4]张代涛,宋菊芳.钢筋网水泥砂浆加固砖砌体房屋振动台试验研究[J].工程抗震,1996(3):32-36.ZHANG Dai-tao,SONG Ju-fang.Shaking table test of brick masonry building strengthened by cement mortar reinforced with steel mesh[J].Engineering Seismology,1996(3):32-36.
[5]贾洪波.配筋砌块砌体粘钢增强后平面外偏压承载性能试验研究[D].哈尔滨:哈尔滨工业大学,2006.
[6]马人乐,蒋璐,梁峰,等.体外预应力加固砌体结构振动台试验研究[J].建筑结构学报,2011,32(5):92-99.MA Ren-le,JIANG Lu,LIANG Feng,et al.Shaking table tests of masonry structures strengthened using external prestressing technique[J].Journal of Building Structures,2011,32(5):92-99.
[7]曹万林,周中一,王卿,等.农村房屋新型隔震与抗震砌体结构振动台试验研究[J].振动与冲击,2011,30(11):209-213.CAO Wan-lin,ZHONG Zhong-yi,WANG Qing,et al.Experimental study on base vibration isolation and anti-seismic masonry structure in rural areas by shaking table test[J].Journal of Vibration and Shock,2011,30(11):209-213.
[8]郭樟根,刘佳亮,孙伟民,等.FRP加固砌体结构的研究与应用[J].南京工业大学学报,2008,30(1):106-110.GUO Zhang-gen,LIU Jia-liang,SUN Wei-min,et al.Research and application of FRP reinforced masonry structures[J].Journal of Nanjing University of Technology,2008,30(1):106-110.
[9]ElGawady M,Lestuzzi P,Badoux M,et al.Aseismic retrofitting of unreinforced masonry walls using FRP[J].Composites,2006,36:148-162.
[10]Borri A,Castori G,Corradi M.Shear behavior of masonry panels strengthened by high strength steel cords[J].Construction and Building Materials,2010,36:1-10.
[11]Wei C Q,Zhou X G,Ye L P.Experimental study of masonry walls strengthened with CFRP[J].Structural Engineering and Mechanics,2007,25(6):675-690.
[12]谢剑.碳纤维布加固修复砌体结构新技术研究[D].天津:天津大学,2005.
[13]姚远.碳纤维加固严重破坏砌体墙的试验研究[D].重庆:重庆大学,2010.
[14]Ehsani M R.Strengthening of earthquake damaged masonry structures with composite materials[J].Non-metallic(FRP)Reinforcement Concrete Struct.RILEM.,1995,36:1-10.
[15]孙衍英,刘伊琳,胡海涛.玄武岩纤维布加固钢筋混凝土梁受力性能的研究[J].青岛理工大学学报,2010,31(1):29-32.SUN Yan-ying,LIU Yi-lin,HU Hai-tao.Experimental study on reinforced concrete beams strengthened with BFRP[J].Journal of Qingdao Technological University,2010,31(1):29-32.
[16]余江涛,苏磊,陆洲导,等.玄武岩纤维加固震损三维混凝土框架节点抗震试验[J].同济大学学报,2010,39(1):18-24.YU Jiang-tao,SU Lei,LU Zhou-dao,et al.Experimental study on bfrp reinforced pre damaged concrete beam column joints by simulated earthquake[J].Journal of Tongji University,2010,39(1):18-24.
[17]郦敏浩,卢文胜,张晖.组合隔振砌体“等代结构”模型试验方法初探[J].结构工程师,2012,28(1):121-128.LI Min-hao,LU Wen-sheng,ZHANG Hui.Preliminary testing approaches for the“Equivalent Structure”model of masonry structures with composite isolators[J].Structural Engineers,2012,28(1):121-128.
[18]吕西林.复杂高层建筑结构抗震理论与应用[M].北京:科学出版社,2007:261-262.
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