喷射GFRP抗压加固砖砌体的受压承载力分析
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摘要
采用喷射短切玻璃纤维增强聚合物(GFRP)的方法对砖砌体受压标准试件进行抗压加固,通过对砖砌体轴心受压试件和偏心受压试件的抗压加载试验,探讨了该加固方法对砖砌体受压破坏形态、极限承载力和极限变形能力的影响,并研究了喷射加固层厚度、短切玻璃纤维长度以及加铺玻璃纤维粗网格布对砌体受压加固效果的影响.结果表明:喷射GFRP加固方法可以极大地提高砖砌体的极限受压承载力和变形能力,有效延缓砌体受压构件初始裂缝的出现和扩展,改善无筋砌体受压的脆性破坏特征;轴压加固试件的极限受压承载力和极限压应变分别平均提高79.9%和60.3%,偏心受压试件的极限受压承载力和极限压应变分别平均提高136.7%和90.8%;砌体受压加固的最佳喷射厚度为7mm,最佳短切纤维长度为25mm.文中还提出了喷射GFRP抗压加固矩形截面砌体柱的极限承载力简化计算公式,计算结果与试验结果吻合良好.
In this paper,firstly,standard compressive specimens of brick masonry were strengthened with sprayed chopped glass fibre-reinforced polymer(GFRP).Then,the specimens were tested under both the concentrically and the eccentrically axial compressions,and the failure mode,the ultimate bearing capacity and the ultimate deformability of the strengthened specimens were explored.Finally,the strengthening effects affected by the spraying thickness,the chopped fibre length and the combination with glass fibre gridding sheet were investigated.The results indicate that(1) spraying GFRP significantly increases the ultimate bearing capacity and the deformability of brick masonry in compression,effectively postpones the emergence and propagation of initial cracks,and fairly improves the brittle behaviour of unreinforced masonry;(2) the ultimate compressive capacity and the ultimate compressive strain of the strengthened specimens under concentric compression averagely increase by 79.9% and 60.3%,respectively,while those of the specimens under eccentric compression averagely increase by 136.7% and 90.8%,respectively;and(3) the optimal spraying thickness and chooped fibre length for compressively-streng-thened brick masonry are 7mm and 25mm,respectively.In addition,the calculated values of ultimate bearing capacity obtained by the proposed simplified formula accord well with the test ones.
In this paper,firstly,standard compressive specimens of brick masonry were strengthened with sprayed chopped glass fibre-reinforced polymer(GFRP).Then,the specimens were tested under both the concentrically and the eccentrically axial compressions,and the failure mode,the ultimate bearing capacity and the ultimate deformability of the strengthened specimens were explored.Finally,the strengthening effects affected by the spraying thickness,the chopped fibre length and the combination with glass fibre gridding sheet were investigated.The results indicate that(1) spraying GFRP significantly increases the ultimate bearing capacity and the deformability of brick masonry in compression,effectively postpones the emergence and propagation of initial cracks,and fairly improves the brittle behaviour of unreinforced masonry;(2) the ultimate compressive capacity and the ultimate compressive strain of the strengthened specimens under concentric compression averagely increase by 79.9% and 60.3%,respectively,while those of the specimens under eccentric compression averagely increase by 136.7% and 90.8%,respectively;and(3) the optimal spraying thickness and chooped fibre length for compressively-streng-thened brick masonry are 7mm and 25mm,respectively.In addition,the calculated values of ultimate bearing capacity obtained by the proposed simplified formula accord well with the test ones.
引文
[1]Elgawady M A,Lestuzzi P,Badoux M.Aseismic retrofit-ting of unreinforced masonry walls using FRP[J].Com-posites(Part B):Engineering,2006,37(2):148-162.
[2]赵彤,张晨军,谢剑,等.碳纤维布用于砖砌体抗震加固的试验[J].地震工程与工程振动,2001,21(2):89-95.Zhao Tong,Zhang Chen-jun,Xie Jian,et al.Experimentalstudy on seismic reinforcement of brick masonry wallswith continous carbon fiber sheet[J].Earthquake Engi-neering and Engineering Vibration,2001,21(2):89-95.
[3]谷倩,彭波,刘卫国,等.碳纤维布抗震加固开门窗洞口砌体墙片的试验研究与受剪承载力分析[J].建筑结构学报,2007,28(1):80-88.Gu Qian,Peng Bo,Liu Wei-guo,et al.Experimental inves-tigations and analysis of shear capacity of masonry wallswith window and door openings reinforced with CFRPsheets[J].Journal of Building Structures,2007,28(1):80-88.
[4]田水,彭少民,谷倩.CFRP加固实心黏土砖柱研究[J].武汉理工大学学报,2006,28(4):59-62.Tian Shui,Peng Shao-min,Gu Qian.Research on brickcolumns strengthened by CFRP[J].Journal of WuhanUniversity of Technology,2006,28(4):59-62.
[5]黄奕辉,陈华艳,罗才松.玻璃纤维布包裹加固砖柱轴压试验研究与极限承载力分析[J].建筑结构学报,2009,30(2):136-142.Huang Yi-hui,Chen Hua-yan,Luo Cai-song.Experimentstudy and analysis of ultimate capacity on brick masonrycoulmns wrapped with glass fiber reinforced plastic sheetunder axial compression[J].Journal of Building Struc-tures,2009,30(2):136-142.
[6]Boyd A J.Rehabilitation of reinforced concrete beamswith sprayed glass fibre reinforced polymers[D].Van-couver:Department of Civil Engineering,The University ofBritish Columbia,2000.
[7]Soleimani S M.Sprayed glass fibre reinforced polymers inshear strengthening and enhancement of impact resistanceof reinforced concrete beams[D].Vancouver:Departmentof Civil Engineering,The University of British Columbia,2006.
[8]Banthia N,Tennyson R,Mufti A.World s first bridge withsprayed FRP strengthening,revisited after five years[C]∥Amir M,Antonio N.Proceedings of the 3rd InternationalConference on Composites in Civil Engineering(CICE2006).Miami:IIFC,2006:653-656.
[9]Shaheen E,Shrive NG.Sprayed glass fibre reinforced pol-ymer masonry columns under concentric and eccentricloading(1):report[J].Canadian Journal of Civil Engi-neering,2007,34(11):1495-1505.
[10]Gu Q,Peng B,Li F,et al.In-plane Seismic strengtheningof masonry walls with sprayed glass fibre reinforced poly-mer[C]∥Song G B,Malla R B.Proceedings of the 12thBiennial ASCE Aerospace Division International Confe-rence on Engineering,Science,Construction,and Opera-tions in Challenging Environments(ASCE Earth&Space 2010).Honolulu:ASCE Press,2010:2829-2840
[11]张智,谷倩,霍凯成.喷射玻璃纤维聚合物加固砖墙试验研究[J].武汉理工大学学报,2010,32(13):58-61.Zhang Zhi,Gu Qian,Huo Kai-cheng.Experimental in-vestigations of masonry walls strengthened by SGFRP[J].Journal of Wuhan University of Technology,2010,32(13):58-61.
[12]卢亦焱,史健勇,赵国藩.碳纤维布约束轴心受压混凝土方形柱承载力计算研究[J].工程力学,2004,21(4):22-27.Lu Yi-yan,Shi Jian-yong,Zhao Guo-fan.Study of axialbearing capacity of square concrete columns confinedwith carbon fiber reinforced plastic[J].EngineeringMechanics,2004,21(4):22-27.
[13]罗苓隆,过镇海.箍筋约束混凝土的受力机理及应力-应变全曲线的计算[R].清华大学抗震抗爆工程研究室科学研究报告集(第6集).北京:清华大学出版社,1996.
[2]赵彤,张晨军,谢剑,等.碳纤维布用于砖砌体抗震加固的试验[J].地震工程与工程振动,2001,21(2):89-95.Zhao Tong,Zhang Chen-jun,Xie Jian,et al.Experimentalstudy on seismic reinforcement of brick masonry wallswith continous carbon fiber sheet[J].Earthquake Engi-neering and Engineering Vibration,2001,21(2):89-95.
[3]谷倩,彭波,刘卫国,等.碳纤维布抗震加固开门窗洞口砌体墙片的试验研究与受剪承载力分析[J].建筑结构学报,2007,28(1):80-88.Gu Qian,Peng Bo,Liu Wei-guo,et al.Experimental inves-tigations and analysis of shear capacity of masonry wallswith window and door openings reinforced with CFRPsheets[J].Journal of Building Structures,2007,28(1):80-88.
[4]田水,彭少民,谷倩.CFRP加固实心黏土砖柱研究[J].武汉理工大学学报,2006,28(4):59-62.Tian Shui,Peng Shao-min,Gu Qian.Research on brickcolumns strengthened by CFRP[J].Journal of WuhanUniversity of Technology,2006,28(4):59-62.
[5]黄奕辉,陈华艳,罗才松.玻璃纤维布包裹加固砖柱轴压试验研究与极限承载力分析[J].建筑结构学报,2009,30(2):136-142.Huang Yi-hui,Chen Hua-yan,Luo Cai-song.Experimentstudy and analysis of ultimate capacity on brick masonrycoulmns wrapped with glass fiber reinforced plastic sheetunder axial compression[J].Journal of Building Struc-tures,2009,30(2):136-142.
[6]Boyd A J.Rehabilitation of reinforced concrete beamswith sprayed glass fibre reinforced polymers[D].Van-couver:Department of Civil Engineering,The University ofBritish Columbia,2000.
[7]Soleimani S M.Sprayed glass fibre reinforced polymers inshear strengthening and enhancement of impact resistanceof reinforced concrete beams[D].Vancouver:Departmentof Civil Engineering,The University of British Columbia,2006.
[8]Banthia N,Tennyson R,Mufti A.World s first bridge withsprayed FRP strengthening,revisited after five years[C]∥Amir M,Antonio N.Proceedings of the 3rd InternationalConference on Composites in Civil Engineering(CICE2006).Miami:IIFC,2006:653-656.
[9]Shaheen E,Shrive NG.Sprayed glass fibre reinforced pol-ymer masonry columns under concentric and eccentricloading(1):report[J].Canadian Journal of Civil Engi-neering,2007,34(11):1495-1505.
[10]Gu Q,Peng B,Li F,et al.In-plane Seismic strengtheningof masonry walls with sprayed glass fibre reinforced poly-mer[C]∥Song G B,Malla R B.Proceedings of the 12thBiennial ASCE Aerospace Division International Confe-rence on Engineering,Science,Construction,and Opera-tions in Challenging Environments(ASCE Earth&Space 2010).Honolulu:ASCE Press,2010:2829-2840
[11]张智,谷倩,霍凯成.喷射玻璃纤维聚合物加固砖墙试验研究[J].武汉理工大学学报,2010,32(13):58-61.Zhang Zhi,Gu Qian,Huo Kai-cheng.Experimental in-vestigations of masonry walls strengthened by SGFRP[J].Journal of Wuhan University of Technology,2010,32(13):58-61.
[12]卢亦焱,史健勇,赵国藩.碳纤维布约束轴心受压混凝土方形柱承载力计算研究[J].工程力学,2004,21(4):22-27.Lu Yi-yan,Shi Jian-yong,Zhao Guo-fan.Study of axialbearing capacity of square concrete columns confinedwith carbon fiber reinforced plastic[J].EngineeringMechanics,2004,21(4):22-27.
[13]罗苓隆,过镇海.箍筋约束混凝土的受力机理及应力-应变全曲线的计算[R].清华大学抗震抗爆工程研究室科学研究报告集(第6集).北京:清华大学出版社,1996.
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