外包角钢与碳纤维布复合加固钢筋混凝土柱抗剪性能试验研究
|
摘要
外包角钢与碳纤维布(CFRP)复合加固钢筋混凝土柱是一种新型加固方式。对6根复合加固柱及1根未加固对比柱进行低周反复受剪性能试验研究,探讨影响复合加固柱抗剪性能的因素,并分析不同条件下CFRP与外包钢缀板的应变情况。试验结果表明,复合加固方法能显著提高钢筋混凝土柱的抗剪承载力,试验中最大提高47%,且复合加固柱在破坏时延性得到较大程度的改善。在轴压比较低的范围内,复合加固柱的抗剪承载力随轴压比的增大而增大,但其延性下降。随着钢缀板加固量的增大,复合加固柱的抗剪承载力随之增大。随着复合加固柱剪跨比的增大,其抗剪承载力随之降低,但外加片材应变增大。CFRP与角钢复合加固体系能很好的约束混凝土的横向变形,两种材料能良好地共同工作,但约束材料强度的发挥是有限的,在达到极限承载力时,两种加固材料都不能被充分利用。
The objective is to develop an innovative strengthening system for concrete columns by using a combination of externally bonded carbon fiber reinforced polymer(CFRP)sheets and externally bonded steel angles.Experiments were carried out for a non-strengthened control column and six columns strengthened with a combination of bonded CFRP and bonded steel angles,and the strengthening effect on the shear performance were investigated under axial load and cyclic shear load.Factors that affect the shear behavior of the strengthened columns as well as the strains of CFRP and the bonded steel pieces under various conditions were discussed.Experimental results reveal that strengthened columns exhibit higher shear capacity and superior ductility in comparison with the control column,with the shear capacity being increased by up to 47%.At relatively low axial load ratio,shear capacities of the strengthened columns increase with the increase of axial load ratio.With the increase of shear-span ratio,shear capacities decrease,whereas the strains of the bonded materials increase significantly.The combination strengthening system can effectively restrain the transverse deformation of concrete columns,and both CFRP and steel angles can work well with the concrete.However,the restraint effect of the combination strengthening system is limited,neither CFRP nor steel angles can make the best of its strength at ultimate shear capacity state.
The objective is to develop an innovative strengthening system for concrete columns by using a combination of externally bonded carbon fiber reinforced polymer(CFRP)sheets and externally bonded steel angles.Experiments were carried out for a non-strengthened control column and six columns strengthened with a combination of bonded CFRP and bonded steel angles,and the strengthening effect on the shear performance were investigated under axial load and cyclic shear load.Factors that affect the shear behavior of the strengthened columns as well as the strains of CFRP and the bonded steel pieces under various conditions were discussed.Experimental results reveal that strengthened columns exhibit higher shear capacity and superior ductility in comparison with the control column,with the shear capacity being increased by up to 47%.At relatively low axial load ratio,shear capacities of the strengthened columns increase with the increase of axial load ratio.With the increase of shear-span ratio,shear capacities decrease,whereas the strains of the bonded materials increase significantly.The combination strengthening system can effectively restrain the transverse deformation of concrete columns,and both CFRP and steel angles can work well with the concrete.However,the restraint effect of the combination strengthening system is limited,neither CFRP nor steel angles can make the best of its strength at ultimate shear capacity state.
引文
[1]赵国藩主编.高等钢筋混凝土结构学[M].北京:中国电力出版社,1999(Zhao Guofan.Advanced reinforced concretestructures[M].Beijing:China Electric Power Press,1999(in Chinese))
[2]万墨林,韩继云.混凝土结构加固技术[M].北京:中国建筑工业出版社,1995(Wan Molin,Han Jiyun.Strengtheningtechnique for concrete structures[M].Beijing:ChinaArchitecture&Building Press,1995(in Chinese))
[3]赵彤,谢剑.碳纤维布补强加固混凝土结构新技术[M].天津:天津大学出版社,2001(Zhao Tong,Xie Jian.A newtechnique of repairing and strengthening concrete structureswith continuous carbon fiber sheets[M].Tianjing:TianjingUniversity Press,2001(in Chinese))
[4]Saadatmanesh H,Ehsani M R,Li M W.Strength andductility of concrete columns externally reinforced with fibercomposite straps[J].ACI Structural Journal,1994,91(4):434-447
[5]Sheikh S A,Yau G.Seismic behavior of concrete columnsconfined with steel and fiber-reinforced polymers[J].ACIStructural Journal,2002,99(l):72-80
[6]Pantelides C P,Gergely J,Reaveley L D,et al.Retrofit ofRC bridge pier with CFRP advanced composites[J].Journalof Structural Engineering,1999,12(5 10):1094-1099
[7]刘匀,张林绪,姜维山,等.外包钢新材料灌浆加固钢筋混凝土柱的研究与实践[J].西安建筑科技大学学报,1997,29(4):68-71(Liu Yun,Zhang Linxu,Jiang Weishan,etal.Strengthening RC column by pouring with new SRCmaterial[J].J.Xi’an Univ.of Arch.&Tech.,1997,29(4):68-71(in Chinese))
[8]卢亦焱,史健勇,赵国藩.碳纤维布和角钢复合加固轴心受压混凝土柱的试验研究[J].建筑结构学报,2003,24(5):18-23(Lu Yiyan,Shi Jianyong,Zhao Guofan.Experimentalresearch on concrete columns strengthened with the combi-nation of CFRP and angle steel[J].Journal of BuildingStructures,2003,24(5):18-23(in Chinese))
[9]卢亦焱,高作平,史健勇,等.一种加固混凝土受压构件的方法:中国,CN 01133612.9[P].2002(Lu Yiyan,GaoZuoping,Shi Jianyong,et al.A method to strengthenconcrete compression members:China,CN 01133612.9[P].2002(in Chinese))
[10]陈少雄.碳纤维布和角钢复合加固钢筋混凝土柱抗震性能研究[D].武汉:武汉大学,2004(Chen Shaoxiong.Experimentalresearch on seismic behavior of reinforced concrete columnscombination rehabilitation with bonded steel angles andcarbon fiber reinforced polymer sheet[D].Wuhan:WuhanUniversity,2004(in Chinese))
[11]JGJ101—96建筑抗震试验方法规程[S](JGJ101—96Specification of testing methods for earthquake resistance[S](in Chinese))
[12]朱伯龙主编.结构抗震实验[M].北京:地震出版社,199(0 ZhuBolong.Structures seismic test[M].Beijing:EarthquakePress,1990(in Chinese))
[13]赵树红,叶列平,李全旺,等.纤维布加固钢筋混凝土柱受剪性能试验研究[J].工业建筑,2000,3(0 2):12-15(ZhaoShuhong,Ye Lieping,Li Quanwang,et al.Experimentalresearch on shear behaviors for concrete column strengthenedwith CFS[J].Industrial Construction,2000,30(2):12-15(in Chinese))
[2]万墨林,韩继云.混凝土结构加固技术[M].北京:中国建筑工业出版社,1995(Wan Molin,Han Jiyun.Strengtheningtechnique for concrete structures[M].Beijing:ChinaArchitecture&Building Press,1995(in Chinese))
[3]赵彤,谢剑.碳纤维布补强加固混凝土结构新技术[M].天津:天津大学出版社,2001(Zhao Tong,Xie Jian.A newtechnique of repairing and strengthening concrete structureswith continuous carbon fiber sheets[M].Tianjing:TianjingUniversity Press,2001(in Chinese))
[4]Saadatmanesh H,Ehsani M R,Li M W.Strength andductility of concrete columns externally reinforced with fibercomposite straps[J].ACI Structural Journal,1994,91(4):434-447
[5]Sheikh S A,Yau G.Seismic behavior of concrete columnsconfined with steel and fiber-reinforced polymers[J].ACIStructural Journal,2002,99(l):72-80
[6]Pantelides C P,Gergely J,Reaveley L D,et al.Retrofit ofRC bridge pier with CFRP advanced composites[J].Journalof Structural Engineering,1999,12(5 10):1094-1099
[7]刘匀,张林绪,姜维山,等.外包钢新材料灌浆加固钢筋混凝土柱的研究与实践[J].西安建筑科技大学学报,1997,29(4):68-71(Liu Yun,Zhang Linxu,Jiang Weishan,etal.Strengthening RC column by pouring with new SRCmaterial[J].J.Xi’an Univ.of Arch.&Tech.,1997,29(4):68-71(in Chinese))
[8]卢亦焱,史健勇,赵国藩.碳纤维布和角钢复合加固轴心受压混凝土柱的试验研究[J].建筑结构学报,2003,24(5):18-23(Lu Yiyan,Shi Jianyong,Zhao Guofan.Experimentalresearch on concrete columns strengthened with the combi-nation of CFRP and angle steel[J].Journal of BuildingStructures,2003,24(5):18-23(in Chinese))
[9]卢亦焱,高作平,史健勇,等.一种加固混凝土受压构件的方法:中国,CN 01133612.9[P].2002(Lu Yiyan,GaoZuoping,Shi Jianyong,et al.A method to strengthenconcrete compression members:China,CN 01133612.9[P].2002(in Chinese))
[10]陈少雄.碳纤维布和角钢复合加固钢筋混凝土柱抗震性能研究[D].武汉:武汉大学,2004(Chen Shaoxiong.Experimentalresearch on seismic behavior of reinforced concrete columnscombination rehabilitation with bonded steel angles andcarbon fiber reinforced polymer sheet[D].Wuhan:WuhanUniversity,2004(in Chinese))
[11]JGJ101—96建筑抗震试验方法规程[S](JGJ101—96Specification of testing methods for earthquake resistance[S](in Chinese))
[12]朱伯龙主编.结构抗震实验[M].北京:地震出版社,199(0 ZhuBolong.Structures seismic test[M].Beijing:EarthquakePress,1990(in Chinese))
[13]赵树红,叶列平,李全旺,等.纤维布加固钢筋混凝土柱受剪性能试验研究[J].工业建筑,2000,3(0 2):12-15(ZhaoShuhong,Ye Lieping,Li Quanwang,et al.Experimentalresearch on shear behaviors for concrete column strengthenedwith CFS[J].Industrial Construction,2000,30(2):12-15(in Chinese))
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心