高延性混凝土加固震损混凝土短柱轴压性能试验及承载能力研究

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摘要

通过9个高延性混凝土（HDC）加固震损混凝土短柱轴心受压试验，研究了在大的截面尺寸和高度下HDC加固对混凝土短柱加固效果的影响程度，探讨了HDC加固混凝土短柱的承载能力以及变形能力。试验结果表明：利用HDC良好的裂缝控制能力和界面黏结能力，使得受损混凝土短柱的峰值应力达到原柱的80％~90％，峰值荷载提高了10％~30％，纵向极限应变提高了约47％~141％，对应的纵向极限荷载提高了约48.7％~129.0％，横向极限应变可达0.42%~0.77%，约为加固前的2倍~3倍，横向极限荷载提高了23％~112％，受损混凝土短柱的延性得到极大地增强，承载能力得到一定程度地提高。对应力应变全过程曲线进行拟合分析，实测曲线与计算曲线拟合较好。基于破坏机理与约束理论，给出轴心受压承载力公式，公式计算值与试验实测值吻合较好。

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	寇佳亮
	李豹
	徐炎
	景国强
	周恒

关键词 ：高延性混凝土(HDC), 混凝土短柱, 轴心受压, 加固, 承载力公式

Abstract：Through the axial compression test of 9 short ductile reinforced concrete short columns reinforced with high ductility concrete (HDC), the effect of HDC reinforcement on the short concrete column reinforced effect under large cross-sectional size and height was studied.The bearing capacity and deformation capacity of HDC reinforced concrete short columns was discussed.The test results show that the peak stress of damaged concrete short columns can reach 80%-90% of the original columns, the peak load can be increased by 10%-30%, the longitudinal ultimate strain can be increased by 47%-141%, the corresponding longitudinal ultimate load can be increased by 48.7%-129.0%, and the transverse ultimate strain can reach 0.42%-0.77%, which is about 2-3 times of that of the original columns before reinforcement.The transverse ultimate load is increased by 23%-112%, the ductility of damaged concrete short columns is greatly enhanced, and the bearing capacity is improved to a certain extent.The whole stress-strain curve is fitted and analyzed and the measured curve fitted well with the calculated one.Based on the failure mechanism and constraint theory, the formula of bearing capacity under axial compression is given.The calculated value of the formula is in good agreement with the experimental data.

Key words： high ductile concrete(HDC) concrete stud axial compression strengthening bearing capacity formula

收稿日期: 2019-11-26 出版日期: 2021-08-28

引用本文:

寇佳亮，李豹，徐炎，景国强，周恒. 高延性混凝土加固震损混凝土短柱轴压性能试验及承载能力研究[J]. 振动与冲击, 2021, 40(16): 234-244.
KOU Jialiang, LI Bao, XU Yan, JING Guoqiang, ZHOU Heng. An experimental study on axial compression performance and load capacity analysis of HDC reinforced short columns of damaged concrete. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(16): 234-244.

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http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2021/V40/I16/234

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