预加轴力下FRP-钢管约束混凝土构件的冲击性能
|
摘要
为研究预加轴力下FRP-钢管约束混凝土构件在冲击荷载下的动力响应,运用有限元分析方法建立构件模型并进行模拟,得到构件冲击之后的变形图,探究轴向压力大小、约束效应系数、钢管屈服强度、混凝土强度四种因素对构件冲击性能的影响,绘制构件的冲击力峰值曲线和跨中挠度峰值曲线作为判断冲击性能的参考.模拟结果表明,试件两端预加150 kN轴力即轴压比0.15时,试件冲击力峰值最大;增大约束效应系数可以改善构件抗冲击性能;在150 kN轴向压力下,增大钢管屈服强度,试件冲击力峰值呈线性增大,跨中挠度峰值呈现线性减小;改变混凝土强度对试件跨中挠度影响较小.
In order to study the dynamic response of axially preloaded concrete filled FRP-steel tubes under impact load, the finite element analysis method was used to simulate component model, and the component deformation diagram after impacting was obtained. The effects of axial force, FRP constraining factor, steel tube yield strength and concrete compressive strength on impact properties of components were investigated. Impact force peak curve and mid-span deflection peak curve of the specimens were drawn as a reference to judge the impact properties. Simulation results show that when the axial force of two ends of the specimen are up to 150 kN(the axial pressure ratio is 0.15), the impact peak value of specimens reach to maximum. The impact properties of specimen should be improved by increasing FRP constraining factor. Under the 150 kN axial force, the impact peak value of the specimen increases linearly and the peak value of mid-span deflection decreases linearly along with yield strength of the steel tube increases. The change of concrete strength has little effect on the mid-span deflection of the specimen.
In order to study the dynamic response of axially preloaded concrete filled FRP-steel tubes under impact load, the finite element analysis method was used to simulate component model, and the component deformation diagram after impacting was obtained. The effects of axial force, FRP constraining factor, steel tube yield strength and concrete compressive strength on impact properties of components were investigated. Impact force peak curve and mid-span deflection peak curve of the specimens were drawn as a reference to judge the impact properties. Simulation results show that when the axial force of two ends of the specimen are up to 150 kN(the axial pressure ratio is 0.15), the impact peak value of specimens reach to maximum. The impact properties of specimen should be improved by increasing FRP constraining factor. Under the 150 kN axial force, the impact peak value of the specimen increases linearly and the peak value of mid-span deflection decreases linearly along with yield strength of the steel tube increases. The change of concrete strength has little effect on the mid-span deflection of the specimen.
引文
[1] XIAO Y. Applications of FRP composites in concrete columns[J]. Advances in Structural Engineering, 2001, 7(4):335-343.
[2]XUE B, GONG J. Study on steel reinforced concrete-filled GFRP tubular column under compression[J]. Thin-Walled Structures, 2016, 106:1-8.
[3]刘昌永,孙士鹏,胡清,等.FRP-钢夹层复合管混凝土桥墩轴压承载力试验[J/OL].哈尔滨工业大学学报,2018(12):31-37.LIU C Y,SUN S P,HU Q, et al. FRP-interlayer-steel tube concrete column piers under axial compression[J/OL].Journal of Harbin University of Technology, 2018(12):31-37.(in Chinese)
[4] FATTAH A A E. New axial stress-strain model of square concrete columns confined with lateral steel and FRP[J]. Composite Structures, 2018,202:731-751.
[5] MOHAMED H M, MASMOUDI R. Flexural strength and behavior of steel and FRP-reinforced concrete-filled FRP tube beams[J]. Engineering Structures, 2010, 32(11):3789-3800.
[6] 李杉, 卢亦焱, 李娜,等. FRP-圆钢管混凝土柱受剪性能试验研究[J]. 建筑结构学报, 2012, 33(11):107-114.LI S,LU Y Y,LI N,et al. Experimental study on shear resistance performance of concrete filled circular FRP-steel tube columns[J].Journal of Architectural Structure,2012, 33(11):107-114.(in Chinese)
[7] 秦鹏. CFRP约束钢管混凝土柱的抗震性能研究[D]. 长沙:湖南大学, 2016.QIN P. Research of seismic performance on CFRP confined concrete-filled steel tubular columns[D].Changsha:Hunan University,2016.(in Chinese)
[8] 朱春阳. FRP-钢管混凝土结构静动力学性能研究[D]. 大连:大连海事大学, 2015.ZHU C Y. Study on static and dynamic properties of concrete filled FRP-steel tubes[D].Dalian: Dalian Maritime University,2015.(in Chinese)
[9] 郭樟根, 曹双寅, 王安宝,等. 爆炸荷载作用下外贴FRP加固钢筋混凝土双向板试验研究[J]. 建筑结构学报, 2011, 32(2):91-97.GUO Z G,CAO S Y,WANG A B,et al. Experimental study on performance of FRP strengthened RC two-ways labs under explosion load.[J].Journal of Architectural structure,2011, 32(2):91-97.(in Chinese)
[10] 王潇宇,DEMARTINO C,徐金俊,等.侧向冲击作用下钢管混凝土柱动力响应试验研究及计算方法[J].土木工程学报,2017,50(12):28-36.WANG X Y, DEMARTINO C, XU J J, et al. Dynamic response of concrete filled steel tube column under lateral impact load experimental study and calculation method[J].Journal of Civil Engineering,2017,50(12):28-36.(in Chinese)
[11] WANG R, HAN L H, TAO Z. Behavior of FRP-concrete-steel double skin tubular members under lateral impact: experimental study[J]. Thin-Walled Structures, 2015, 95:363-373.
[12]李强. 低速横向冲击荷载下CFRP加固钢管性能研究[D].杭州:浙江大学,2016.LI Q. Performance research of CFRP reinforced pipes subjected to low-velocity transverse impact loads[D].Hangzhou:Zhejiang University,2016.(in Chinese)
[13]ALAM M I, FAWZIA S, ZHAO X L, et al. Performance and dynamic behaviour of FRP strengthened CFST members subjected to lateral impact[J]. Engineering Structures,2017,147:160-176.
[14] 陈忱. FRP钢管混凝土构件抗冲击性能研究[D]. 大连:大连海事大学, 2016.CHEN C. Research on the impact performance of concrete filled steel tubes with FRP composites[D].Dalian: Dalian Maritime University,2016.(in Chinese)
[15] 刘兰. FRP与钢管混凝土复合柱基本力学性能研究[D]. 武汉:武汉大学, 2009LIU L. Research on the basic mechanical property of concrete filled FRP and steel tube composite columns[D].Wuhan: Wuhan University,2009.(in Chinese)
[2]XUE B, GONG J. Study on steel reinforced concrete-filled GFRP tubular column under compression[J]. Thin-Walled Structures, 2016, 106:1-8.
[3]刘昌永,孙士鹏,胡清,等.FRP-钢夹层复合管混凝土桥墩轴压承载力试验[J/OL].哈尔滨工业大学学报,2018(12):31-37.LIU C Y,SUN S P,HU Q, et al. FRP-interlayer-steel tube concrete column piers under axial compression[J/OL].Journal of Harbin University of Technology, 2018(12):31-37.(in Chinese)
[4] FATTAH A A E. New axial stress-strain model of square concrete columns confined with lateral steel and FRP[J]. Composite Structures, 2018,202:731-751.
[5] MOHAMED H M, MASMOUDI R. Flexural strength and behavior of steel and FRP-reinforced concrete-filled FRP tube beams[J]. Engineering Structures, 2010, 32(11):3789-3800.
[6] 李杉, 卢亦焱, 李娜,等. FRP-圆钢管混凝土柱受剪性能试验研究[J]. 建筑结构学报, 2012, 33(11):107-114.LI S,LU Y Y,LI N,et al. Experimental study on shear resistance performance of concrete filled circular FRP-steel tube columns[J].Journal of Architectural Structure,2012, 33(11):107-114.(in Chinese)
[7] 秦鹏. CFRP约束钢管混凝土柱的抗震性能研究[D]. 长沙:湖南大学, 2016.QIN P. Research of seismic performance on CFRP confined concrete-filled steel tubular columns[D].Changsha:Hunan University,2016.(in Chinese)
[8] 朱春阳. FRP-钢管混凝土结构静动力学性能研究[D]. 大连:大连海事大学, 2015.ZHU C Y. Study on static and dynamic properties of concrete filled FRP-steel tubes[D].Dalian: Dalian Maritime University,2015.(in Chinese)
[9] 郭樟根, 曹双寅, 王安宝,等. 爆炸荷载作用下外贴FRP加固钢筋混凝土双向板试验研究[J]. 建筑结构学报, 2011, 32(2):91-97.GUO Z G,CAO S Y,WANG A B,et al. Experimental study on performance of FRP strengthened RC two-ways labs under explosion load.[J].Journal of Architectural structure,2011, 32(2):91-97.(in Chinese)
[10] 王潇宇,DEMARTINO C,徐金俊,等.侧向冲击作用下钢管混凝土柱动力响应试验研究及计算方法[J].土木工程学报,2017,50(12):28-36.WANG X Y, DEMARTINO C, XU J J, et al. Dynamic response of concrete filled steel tube column under lateral impact load experimental study and calculation method[J].Journal of Civil Engineering,2017,50(12):28-36.(in Chinese)
[11] WANG R, HAN L H, TAO Z. Behavior of FRP-concrete-steel double skin tubular members under lateral impact: experimental study[J]. Thin-Walled Structures, 2015, 95:363-373.
[12]李强. 低速横向冲击荷载下CFRP加固钢管性能研究[D].杭州:浙江大学,2016.LI Q. Performance research of CFRP reinforced pipes subjected to low-velocity transverse impact loads[D].Hangzhou:Zhejiang University,2016.(in Chinese)
[13]ALAM M I, FAWZIA S, ZHAO X L, et al. Performance and dynamic behaviour of FRP strengthened CFST members subjected to lateral impact[J]. Engineering Structures,2017,147:160-176.
[14] 陈忱. FRP钢管混凝土构件抗冲击性能研究[D]. 大连:大连海事大学, 2016.CHEN C. Research on the impact performance of concrete filled steel tubes with FRP composites[D].Dalian: Dalian Maritime University,2016.(in Chinese)
[15] 刘兰. FRP与钢管混凝土复合柱基本力学性能研究[D]. 武汉:武汉大学, 2009LIU L. Research on the basic mechanical property of concrete filled FRP and steel tube composite columns[D].Wuhan: Wuhan University,2009.(in Chinese)