混凝土柱单轴动态抗压特性的应变率效应研究

PDF(1305 KB)

振动与冲击 ›› 2012, Vol. 31 ›› Issue (2) : 145-150.

论文

混凝土柱单轴动态抗压特性的应变率效应研究

邹笃建，刘铁军，滕军，严桂兰

作者信息 +

The research on strain rate effect of compressive behaviour of concrete column

ZOU Du-jian; LIU Tie-jun; TENG Jun; YAN Gui-lan

Author information +

文章历史 +

摘要

混凝土材料是典型的率敏感材料，不同动态应变率下混凝土柱的抗压性能有明显的变化。本文通过混凝土柱的轴心动态抗压试验，在10-5/s10-2/s应变率范围内研究了混凝土材料本构关系的应变率效应，系统研究了应变率效应对混凝土抗压强度、弹性模量、峰值应变、吸能能力以及破坏机理的影响，并讨论了试验机刚度、惯性效应对试验结果的影响。试验结果表明：随着应变率的增加，混凝土材料的抗压强度也随之增加，当应变率为10-4/s、10-3/s、10-2/s时混凝土的抗压强度相对准静态抗压强度（应变率为10-5/s）分别增加了7.45%、19.51%和29.23%，弹性模量相对于准静态弹性模量变化不大，峰值应变具有一定的离散性，但是基本趋势也是增加的，混凝土的吸能能力也随着应变率的增加而显著增加。另外，刚性元件的使用有效的改善了试件应变率的稳定性，惯性效应对本次试验结果的影响可以忽略

Abstract

Concrete is a typical rate-sensitive material. According to different strain rate, the compressive behaviour of plain concrete column is affected obviously. In this paper, axial compressive tests for plain concrete columns with different strain rate (10-5/s10-2/s) were carried out. The rate effect on constitutive relation, compressive strength, elastic modulus, peak strain, energy absorption capacity and failure mechanism of concrete columns were studied. The effect of stiffness of machine and inertia effect on experimental results were also discussed. The experimental results show that the compressive strength was increased by 7.45%, 19.51%, 29.23%, when the strain rate was 10-4/s, 10-3/s, 10-2/s, compared with quasi-static strain rate 10-5/s. The variation of elastic modulus could be neglected while the peak strain, energy absorption were increased obviously. In addition, the use of rigid components improved the stability of strain rate and the effect of inertia effect on experimental results could be neglected.

导出引用

邹笃建;刘铁军;滕军;严桂兰. 混凝土柱单轴动态抗压特性的应变率效应研究[J]. 振动与冲击, 2012, 31(2): 145-150

ZOU Du-jian;LIU Tie-jun;TENG Jun;YAN Gui-lan. The research on strain rate effect of compressive behaviour of concrete column[J]. Journal of Vibration and Shock, 2012, 31(2): 145-150