预应力碳纤维条带加固混凝土圆形墩柱恢复力模型试验研究
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摘要
为了研究预应力碳纤维条带加固钢筋混凝土圆形墩柱的抗震性能,对7根钢筋混凝土圆形墩柱在低周反复荷载作用下的滞回性能进行了试验研究,试验考虑的主要参数为环向预应力大小和轴压比。试验结果表明:预应力纤维条带提供的主动横向约束力能够有效抑制斜向剪切裂缝的开展,将圆形墩柱的破坏形态由剪切破坏转变为延性较好的弯曲破坏。通过分析各工况下被加固圆形墩柱的滞回性能,得出其恢复力模型的滞回规则;采用理论分析与试验数据回归分析相结合的方法,给出预应力碳纤维条带加固混凝土圆形墩柱的正截面抗弯承载力计算公式,得出骨架曲线各特征参数的计算方法,确定了卸载刚度和再加载、反复加载下的强度退化率,最终建立了能够考虑轴压比与环向预应力大小两因素的预应力碳纤维条带加固混凝土圆形墩柱三折线型恢复力模型,计算结果与试验结果吻合较好。
To study seismic behavior of circular RC piers strengthened with pre-stressed CFRP belts,seven circular RC piers were tested with the main experimental parameters being lateral pre-stress level of CFRP belts and axial load ratio.Test results show that the diagonal shear cracks of piers can be effectively confined with the active lateral confined stress provided by pre-stressed CFRP belts,and the failure mechanism of the piers may be changed from shear to flexure with satisfactory ductility.By analyzing the effect on the hysteretic characteristics of the piers strengthened under different conditions,a series of hysteretic rules for piers strengthened are suggested;Using theoretical analysis and statistic regression analysis,the formula for flexural capacity is presented,and the methods to calculate characteristic parameters of skeleton curves are proposed,as well as a series of hysteretic rules for piers.The three-line restoring force model of circular RC piers strengthened with lateral pre-stressed CFRP belts is set up,which is capable of considering lateral pre-stress level of CFRP belts and axial load ratio.The result of the model shows good agreement with the test result.
To study seismic behavior of circular RC piers strengthened with pre-stressed CFRP belts,seven circular RC piers were tested with the main experimental parameters being lateral pre-stress level of CFRP belts and axial load ratio.Test results show that the diagonal shear cracks of piers can be effectively confined with the active lateral confined stress provided by pre-stressed CFRP belts,and the failure mechanism of the piers may be changed from shear to flexure with satisfactory ductility.By analyzing the effect on the hysteretic characteristics of the piers strengthened under different conditions,a series of hysteretic rules for piers strengthened are suggested;Using theoretical analysis and statistic regression analysis,the formula for flexural capacity is presented,and the methods to calculate characteristic parameters of skeleton curves are proposed,as well as a series of hysteretic rules for piers.The three-line restoring force model of circular RC piers strengthened with lateral pre-stressed CFRP belts is set up,which is capable of considering lateral pre-stress level of CFRP belts and axial load ratio.The result of the model shows good agreement with the test result.
引文
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[11]Wu Yufei,Liu Tao,Deric J Oehlers.Fundamentalprinciples that govern retrofitting of reinforced concretecolumns by steel and FRP jacketing[J].AdvancedStructural Engineering,2006,9(4):507―533.
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[2]K Nasrollahzadeh Nesheli.Seismic retrofitting ofeartherquake-damaged concrete columns by lateralpre-tensioning of FRP belts[R].8th U.S.NationalConference on Earthquake Engineering.USA,2006.
[3]Shahab Mehdizad Taleie,Hasan Moghaddam.Experimental and analytical investigation of square RCcolumns retrofitted with pre-stressed FRP strips[R].8thInternational Symposium on FRP Reinforcement forConcrete Structures,Greece:2007.
[4]靳鹏.型钢混凝土转换柱(SRC-RC)恢复力模型的研究与理论分析[D].西安:西安建筑科技大学,2007.Jin Peng.Research and theoretical analysis on therestoring force model of steel reinforced concrete transfercolumns[D].Xi’an:Xi’an University of Architecture andTechnology,2007.(in Chinese)
[5]郭子雄,吕西林.高轴压比框架柱恢复力模型试验研究[J].土木工程学报,2004,37(5):32―38.Guo Zixiong,LüXilin.Experimental study on thehysteretic model of RC columns with high axialcompressive ratio[J].China Civil Engineering Journal,2004,37(5):32―38.(in Chinese)
[6]张国军,吕西林,刘伯权.高强混凝土框架柱的恢复力模型研究[J].工程力学,2007,24(3):83―90.Zhang Guojun,Lu Xilin,Liu Boquan.Study onresilience models of high-strength concrete framecolumns[J].Engineering Mechanics,2007,24(3):83―90.(in Chinese)
[7]陶忠,高献,于清.FRP约束圆钢筋混凝土柱滞回性能的理论分析[J].工业建筑,2005,35(9):15―19.Tao Zhong,Gao Xian,Yu Qing.Theoretical analysis ofhysteretic behavior of FRP-confined RC columns[J].Industrial Construction,2005,35(9):15―19.(inChinese)
[8]徐伟栋.配置高强钢筋的混凝土柱抗震性能研究[D].上海:同济大学,2007.Xu Weidong.Seismic behavior of concrete columns withhigh strength steel bars[D].Shanghai:Tongji University,2007.(in Chinese)
[9]Gu Dongsheng,Wu Gang,Wu Zhishen.Ultimateflexural strength of normal section of FRP-confined RCcircular columns[J].Journal of Southeast University(English Edition),2010,26(1):107―111.
[10]白晓彬.环向预应力FRP加固混凝土圆柱轴心受压性能研究[D].北京:北京交通大学,2011.Bai Xiaobin.Study on the performance of circularconcrete columns confined with lateral pre-tensioned frpunder axial load[D].Beijing:Beijing JiaotongUniversity,2011.(in Chinese)
[11]Wu Yufei,Liu Tao,Deric J Oehlers.Fundamentalprinciples that govern retrofitting of reinforced concretecolumns by steel and FRP jacketing[J].AdvancedStructural Engineering,2006,9(4):507―533.
[12]Baris Binici.Design of FRPs in circular bridge columnretrofits for ductility enhancement[J].EngineeringStructures,2008,30:766―776.
[13]郭子雄,张志伟,黄群贤,刘阳.型钢混凝土柱恢复力模型试验研究[J].地震工程与工程振动,2009,29(5):79―85.Guo Zixiong,Zhang Zhiwei,Huang Qunxian,Liu Yang.Experimental study on hysteretic model of SRC columns[J].Journal of Earthquake Engineering and EngineeringVibration,2009,29(5):79―85.(in Chinese)
[14]苏小卒.预应力混凝土框架抗震性能研究[M].上海:上海科学技术出版社,1998:117―123.Su Xiaozu.Seismic performance of prestressed concreteframe[M].Shanghai:Shanghai Science and TechnologyPress,1998:117―123.(in Chinese)
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