预应力碳纤维布加固钢筋混凝土圆形空心高墩抗震性能分析
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摘要
根据已有的对高墩高塔结构地震易损性研究,薄壁高墩在地震作用下容易发生破坏的部位主要位于墩底和墩顶区域;也有文献表明,高墩高塔结构受到自身高阶振型影响,完全损伤发生在距离基础顶面3/4~1/3处.本文在已有研究的基础上,提出不同的钢筋混凝土圆形空心高墩加固方案;考虑环向及纵向碳纤维增强复合材料(Carbon Fiber Reinforced Polymer,CFRP)的布置位置,布置数量及预应力大小等因素,通过动力特性及地震反应谱分析的结果,得到最优的加固方案;进一步通过地震时程分析,进行方案优选,给出钢筋混凝土圆形空心截面高墩的抗震加固的合理方案.结果表明,采用CFRP对圆形空心高墩同时进行环向及纵向加固能提高墩柱的抗震性能,并且纵向CFRP施加的预应力越大,墩柱的抗震性能越好.
According to the seismic fragility analysis of the high-pier and high tower,the damage area concentrated on top and bottom of the thin-walled high-pier under a strong earthquake.Moreover,it is observed that the damage area is on the 3 /4 ~ 1 /3 bottom of the high-pier because of the effect of higher modes. In this paper,based on the existing research results,different strengthening programs of the circular RC hollow high-pier are presented,which considers the location and the layer of the lateral and longitudinal Carbon Fiber Reinforced Composite( CFRP). In addition,the pre-stress value of CFRP is studied. Based on the dynamic characteristics and seismic respon sespectrum analysis,the reasonable strengthening program is initially identified. Through the seismic time history analysis,the optimal seismic strengthening program of circular RC hollow high-pieris recommended. The results show that the seismic resistance of the circular RC hollow high-pier will be highly improved by lateral and longitudinal pre-stressed CFRP. The pre-stress of longitudinal CFRP pre-stressis larger,the seismic performance of the circular RC hollow high-pier is better.
According to the seismic fragility analysis of the high-pier and high tower,the damage area concentrated on top and bottom of the thin-walled high-pier under a strong earthquake.Moreover,it is observed that the damage area is on the 3 /4 ~ 1 /3 bottom of the high-pier because of the effect of higher modes. In this paper,based on the existing research results,different strengthening programs of the circular RC hollow high-pier are presented,which considers the location and the layer of the lateral and longitudinal Carbon Fiber Reinforced Composite( CFRP). In addition,the pre-stress value of CFRP is studied. Based on the dynamic characteristics and seismic respon sespectrum analysis,the reasonable strengthening program is initially identified. Through the seismic time history analysis,the optimal seismic strengthening program of circular RC hollow high-pieris recommended. The results show that the seismic resistance of the circular RC hollow high-pier will be highly improved by lateral and longitudinal pre-stressed CFRP. The pre-stress of longitudinal CFRP pre-stressis larger,the seismic performance of the circular RC hollow high-pier is better.
引文
[1]汤伟红.轴心受压混凝土圆形空心墩柱的FRP约束效应研究[D].湖南:中南大学硕士论文,2011Tang Weihong.Study on the effect of FRP confined concrete circular hollow pier column under axial compression[D].Hunan:Central South University,2011
[2]崔海琴.碳纤维约束空心薄壁墩抗震性能试验研究[D].西安:长安大学,2010Cui Haiqin.Experimental study on seismic behavior of hollow thin-walled pier confined with CFRP[D].Xian:Chang’an University,2010
[3]董旭华,肖岩,王伟,等.GFRP加固RC桥梁短柱滞回性能试验与分析[J].武汉理工大学学报,2006,28(7):59-62Dong Xuhua,Xiao Yan,Wang Wei,et al.Hysteretic behavior of GFRP retrofitted RC bridge short cloumns[J].Journal of Wuhan University of Technology,2006,28(7):59-62
[4]Lignola G P,Prota A,Manfredi G,et al.Non-linear modeling of RC rectangular hollow piers confined with CFRP[J].Composite Structures,2009,88:56-64
[5]吴文朋,李立峰,王连华,等.基于IDA的高墩大跨桥梁地震易损性分析[J].地震工程与工程振动,2012,32(3):117-123Wu Wenpeng,Li Lifeng,Wang Lianhua,et al.Evaluation of seismic vulnerability of high-pier long-span bridge using incremental dynamic analysis[J].Journal of Earthquake Engineering and Engineering Vibration,2012,32(3):117-123
[6]梁智垚.非规则高墩桥梁抗震设计理论研究[D].上海:同济大学,2007Liang Zhiyao.Study on seismic design theory of irregular girder bridges with high piers[D].Shanghai:Tongji University,2007
[7]GB 50111—2006.铁路工程抗震设计规范[S].北京:中国计划出版社,2009GB 50111—2006.Code for seismic design of railway engineering[S].Beijing:China Planning Press,2009
[8]ACI 440.2R—08:Guide for the edsign and construction of externally bonded FRP systems for strengthening concrete structures[S].Reported by ACI Committee 440,American Concrete Institute,2008
[2]崔海琴.碳纤维约束空心薄壁墩抗震性能试验研究[D].西安:长安大学,2010Cui Haiqin.Experimental study on seismic behavior of hollow thin-walled pier confined with CFRP[D].Xian:Chang’an University,2010
[3]董旭华,肖岩,王伟,等.GFRP加固RC桥梁短柱滞回性能试验与分析[J].武汉理工大学学报,2006,28(7):59-62Dong Xuhua,Xiao Yan,Wang Wei,et al.Hysteretic behavior of GFRP retrofitted RC bridge short cloumns[J].Journal of Wuhan University of Technology,2006,28(7):59-62
[4]Lignola G P,Prota A,Manfredi G,et al.Non-linear modeling of RC rectangular hollow piers confined with CFRP[J].Composite Structures,2009,88:56-64
[5]吴文朋,李立峰,王连华,等.基于IDA的高墩大跨桥梁地震易损性分析[J].地震工程与工程振动,2012,32(3):117-123Wu Wenpeng,Li Lifeng,Wang Lianhua,et al.Evaluation of seismic vulnerability of high-pier long-span bridge using incremental dynamic analysis[J].Journal of Earthquake Engineering and Engineering Vibration,2012,32(3):117-123
[6]梁智垚.非规则高墩桥梁抗震设计理论研究[D].上海:同济大学,2007Liang Zhiyao.Study on seismic design theory of irregular girder bridges with high piers[D].Shanghai:Tongji University,2007
[7]GB 50111—2006.铁路工程抗震设计规范[S].北京:中国计划出版社,2009GB 50111—2006.Code for seismic design of railway engineering[S].Beijing:China Planning Press,2009
[8]ACI 440.2R—08:Guide for the edsign and construction of externally bonded FRP systems for strengthening concrete structures[S].Reported by ACI Committee 440,American Concrete Institute,2008