碳纤维布加固钢筋混凝土柱的抗震性能试验研究
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摘要
对3根不同足尺碳纤维片材的加固混凝土柱在水平低周反复荷载作用下进行了试验研究。对比分析了试验柱的抗剪承载力、柱顶位移、延性、滞回曲线、骨架曲线等抗震性能。结果表明:采用碳纤维环绕包裹粘贴加固柱对混凝土柱的抗剪承载力提高较明显,柱的初始刚度增加,柱的变形能力和延性明显提高,钢筋混凝土柱消耗地震能量的能力增强,使柱的抗震性能得到显著改善;二层包裹与一层包裹碳纤维片材对比分析表明,这2种方法对结构影响区别不大,原因在于柱包裹碳纤维提高结构抗震性能主要是套箍作用增加了混凝土柱的约束,且增加层数对增加约束的效应有限。
Three reinforced concrete columns strengthened with carbon fiber sheets under cyclic loading were tested.Analyses were made from the seismic shear capacity,displacement of column top,ductility,hysteretic curve,skeleton curve etc of the seismic behaviors of the specimens columns.The research indicates that concrete columns strengthened with enwrap carbon fiber sheets,improved the seismic shear capacity quite evidence.Because of the increase in the initial stiffness,it can improve the deformation capacity and increase the ductility of the columns obviously,and increase seismic energy dissipation.The seismic behaviors of the reinforced concrete columns improved evidently.Contrast analysis between two layer and one layer enwrap carbon fiber sheets indicate,that two methods have little influence on the structure.The reason is strengthened with enwrap carbon fiber sheets increase the seismic behaviors of the concrete columns is the hooping effect enhance the restrain,add the layer number to increase the restraint effect is finite.
Three reinforced concrete columns strengthened with carbon fiber sheets under cyclic loading were tested.Analyses were made from the seismic shear capacity,displacement of column top,ductility,hysteretic curve,skeleton curve etc of the seismic behaviors of the specimens columns.The research indicates that concrete columns strengthened with enwrap carbon fiber sheets,improved the seismic shear capacity quite evidence.Because of the increase in the initial stiffness,it can improve the deformation capacity and increase the ductility of the columns obviously,and increase seismic energy dissipation.The seismic behaviors of the reinforced concrete columns improved evidently.Contrast analysis between two layer and one layer enwrap carbon fiber sheets indicate,that two methods have little influence on the structure.The reason is strengthened with enwrap carbon fiber sheets increase the seismic behaviors of the concrete columns is the hooping effect enhance the restrain,add the layer number to increase the restraint effect is finite.
引文
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[2]Cecchi A,Milani G,Trelli A.In planeloaded CFRPrein-forced masonry walls mechanical characteristics by hom-ogenization procures[J].Composites Science Technolo-gy,2004,64:1097-1112.
[3]Li mam O,Nguyen V Y,Foret G.Numerical and experi-mental analysis of two way slabs strengthened with CFRP strips[J].Engineering Structure,2005,9:84-95.
[4]A H Al-Saidy,F W Klaiber,T J Wipf,et al.Parametric study on the behavior of short span composite bridge girders strengthened with carbon fiber reinforced poly-mer plates[J].Construction and Building Materials,2008,22:729-737.
[5]卢会芳,孔德志.碳纤维布用于墙体抗震加固方式的研究[J].河南大学学报:自然科学版,2008,38(5):547-550.
[6]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].地震工程与震动控制,2001,21(2):89-95.
[7]张兴宇,刘志,迟春.碳纤维加固法在工程中的应用[J].四川建筑科学研究,2006,32(2):63-64.
[8]黎柏营,陈道政.碳纤维加固技术在某酒店加固改造中的应用[J].工程抗震与加固改造,2007,29(3):76-80.
[9]金波,祖德峰,张敏政,等.碳纤维加固混凝土结构抗震性能的初步研究和应用[J].世界地震工程,2007,23(4):30-33.
[10]朱宇峰.蒸压粉煤灰实心砖墙体抗震性能试验研究[D].重庆:重庆大学,2007.
[11]杨春霞,施楚贤,杨伟军.混凝土多孔砖砌体模型房屋抗震性能试验研究[J].建筑结构学报,2006,27(3):88-92.
[12]赵春香.砌体墙体抗震性能研究[D].哈尔滨:哈尔滨工程大学,2007.
[13]郝彤,刘立新,王仁义.混凝土多孔砖墙体的抗震性能试验研究[J].建筑砌块与砌块建筑,2008(4):22-25.
[14]蒋伟.新型轻质混凝土承重砌体抗震性能试验研究[D].天津:天津大学,2005.
[15]李忠献.工程结构试验理论与技术[M].天津:天津大学出版社,2004:162-164.
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