剪切-黏结破坏高延性混凝土短柱拟静力试验研究
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摘要
为研究高延性混凝土(HDC)短柱发生剪切-黏结破坏时的抗震性能,对7个HDC短柱和1个RC短柱进行了拟静力试验研究,分析轴压比和配箍率对HDC短柱滞回特性、承载力、变形能力和耗能能力的影响.试验结果表明:RC短柱和HDC短柱均发生剪切-黏结破坏,RC短柱沿纵筋的黏结裂缝充分开展后保护层大面积剥落,其破坏形态具有明显脆性,而HDC短柱沿纵筋的黏结裂缝在纤维桥联作用下得到良好控制,未见保护层剥落,其破坏表现出延性特征;与RC短柱相比,HDC短柱的变形能力和耗能能力均有明显提高,HDC短柱的极限位移角提高幅度为43%～112%,极限位移角处累积耗能提高幅度为39%～184%;HDC短柱在不同性能水平下的层间位移参考指标明显大于RC短柱,有利于实现抗震性能设计.
To study the seismic performance of high ductile concrete(HDC) short columns failed in shear-bond mode,seven HDC short columns and one RC short column were tested under pseudo static load. The effects of axial load ratio and stirrups ratio on the hysteresis behavior, shear capacity, deformation capacity and energy dissipation capacity of the HDC short columns were studied. The experimental results indicate that all the RC short column and HDC short columns were failed in shear-bond,the concrete cover of the RC short column was severely crushed after the bond cracks were fully developed. For the HDC short columns,the bond cracks were effectively confined by the fiber bridging effect and thus no crushing of HDC covers was observed,which indicated the HDC short columns were failed in shear-bond with ductility. Compared with the HDC short column,the deformation capacity and energy dissipation capacity of the HDC short columns were significantly improved. The increase of ultimate displacement was43%～112% and the cumulative energy dissipation increase at the ultimate displacement was 39%～184%. In addition,the drift ratios of HDC short columns were larger than that of the RC column in different performance levels,which was good for achieving performance based seismic design.
To study the seismic performance of high ductile concrete(HDC) short columns failed in shear-bond mode,seven HDC short columns and one RC short column were tested under pseudo static load. The effects of axial load ratio and stirrups ratio on the hysteresis behavior, shear capacity, deformation capacity and energy dissipation capacity of the HDC short columns were studied. The experimental results indicate that all the RC short column and HDC short columns were failed in shear-bond,the concrete cover of the RC short column was severely crushed after the bond cracks were fully developed. For the HDC short columns,the bond cracks were effectively confined by the fiber bridging effect and thus no crushing of HDC covers was observed,which indicated the HDC short columns were failed in shear-bond with ductility. Compared with the HDC short column,the deformation capacity and energy dissipation capacity of the HDC short columns were significantly improved. The increase of ultimate displacement was43%～112% and the cumulative energy dissipation increase at the ultimate displacement was 39%～184%. In addition,the drift ratios of HDC short columns were larger than that of the RC column in different performance levels,which was good for achieving performance based seismic design.
引文
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[14]DBJ 61/T 112-2016高延性混凝土应用技术规程[S].北京:中国建筑工业出版社,2016:6—7.DBJ 61/T 112-2016 Technical specification for application of high ductile concrete[S]. Beijing:China Architecture and Building Press,2016:6—7.(In Chinese)
[2] KITAGAWA Y,HIRAISHI H. Overview of the 1995 Hyogo-ken nanbu earthquake and proposals for earthquake mitigation measures[J]. Journal of Jaee,2004,4(3):1—29.
[3] PAPAZOGLOU A J,ELNASHAI A S. Analytical and field evidence of the damaging effect of vertical earthquake ground motion[J].Earthquake Engineering and Structural Dynamics,1996,25(10):1109—1137.
[4]孙治国,王东升,李宏男,等.汶川地震钢筋混凝土框架震害及震后修复建议[J].自然灾害学报,2010,19(4):114—123.SUN Z G,WANG D S,LI H N,et al. Damage investigation of the RC frames in Wenchuan earthquake and suggestions for repair and strengthening[J]. Journal of Natural Disasters,2010,19(4):114—123.(In Chinese)
[5]温增平,徐超,陆鸣,等.汶川地震重灾区典型钢筋混凝土框架结构震害现象[J].北京工业大学学报,2009,35(6):753—760.WEN Z P,XU C,LU M,et al. Damage features of RC frame structures in Wenchuan earthquake[J]. Journal of Beijing University of Technology,2009,35(6):753—760.(In Chinese)
[6]史庆轩,王朋,王秋维.钢筋混凝土柱剪切黏结破坏影响因素分析[J].工程力学,2013(11):136—142.SHI Q X,WANG P,WANG Q W. Analysis of the influencing factors for the shear-bond failure of RC columns[J]. Engineering Mechanics,2013(11):136—142.(In Chinese)
[7]孙治国,司炳君,郭迅,等.钢筋混凝土柱地震剪切-黏结破坏试验研究[J].工程力学,2011,28(3):109—117.SUN Z G,SI B J,GUO X,et al. Experimental research on the shear-bond failure of RC columns under seismic action[J].Engineering Mechanics,2011,28(3):109—117.(In Chinese)
[8]卫军,张萌,董荣珍,等.钢筋锈蚀对混凝土梁破坏模式影响的试验研究[J].湖南大学学报(自然科学版),2013,40(10):15—21.WEI J,ZHANG M,DONG R Z,et al. Experimental research on the failure mode of concrete beam due to corrosion[J]. Journal of Hunan University(Natural Sciences),2013,40(10):15—21.
[9]寇佳亮,邓明科,梁兴文.延性纤维增强混凝土单轴拉伸性能试验研究[J].建筑结构,2013,43(1):59—64.KOU J L,DENG M K,LIANG X W. Experimental study of uniaxial tensile properties of ductile fiber reinforced concrete[J]Building Structure,2013,43(1):59—64.(In Chinese)
[10]邓明科,秦萌,梁兴文.高延性纤维混凝土抗压性能试验研究[J].工业建筑,2015,45(4):120—126.DENG M K,QIN M,LIANG X W. Experimental study of compressive behavior of engineered cementitious composities[J].Industrial Construction,2015,45(4):120—126.(In Chinese)
[11]邓明科,刘海勃,秦萌,等.高延性纤维混凝土抗压韧性试验研究[J].西安建筑科技大学学报(自然科学版),2015,47(5):660—665,678.DENG M K,LIU H B,QIN M,et al. Experimental study research on compressive toughness of the high ductile concrete[J].Journal of Xi'an University of Architecture&Technology(Natural Science Edition),2015,47(5):660—665,678.(In Chinese)
[12]邓明科,张辉,梁兴文,等.高延性纤维混凝土短柱抗震性能试验研究[J].建筑结构学报,2015,36(12):62—69.DENG M K,ZHANG H,LIANG X W,et al. Experimental study on seismic behavior of high ductile fiber reinforced concrete short columns[J]. Journal of Building Structures,2015,36(12):62—69.(In Chinese)
[13]邓明科,卜新星,潘姣姣,等.型钢高延性混凝土短柱抗震性能试验研究[J].工程力学,2017,34(1):163—170.DENG M K,BU X X,PAN J J,et al. Experimental study on seismic behavior of steel reinforced high ductile concrete short columns[J].Engineering Mechanics,2017,34(1):163—170.(In Chinese)
[14]DBJ 61/T 112-2016高延性混凝土应用技术规程[S].北京:中国建筑工业出版社,2016:6—7.DBJ 61/T 112-2016 Technical specification for application of high ductile concrete[S]. Beijing:China Architecture and Building Press,2016:6—7.(In Chinese)