结构尺寸对混凝土双轴动态破坏行为影响细观分析

金浏,李健,余文轩,杜修力

振动与冲击 ›› 2022, Vol. 41 ›› Issue (23) : 1-9.

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (23) : 1-9.
论文

结构尺寸对混凝土双轴动态破坏行为影响细观分析

  • 金浏,李健,余文轩,杜修力
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Meso analysis for effects of structure size on concrete biaxial dynamic failure behavior

  • JIN Liu, LI Jian, YU Wenxuan, DU Xiuli
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摘要

为研究结构尺寸在不同动态双轴工况下对混凝土破坏行为的影响,建立了考虑混凝土材料非均质性的细观力学分析模型,对不同尺寸的立方体混凝土试件在不同应变率(10-5/s、10-2/s和1/s)和不同侧应力比(0、±0.25、±0.50、±0.75、±1.00和-∞)工况下进行了细观数值模拟。研究了混凝土的动态双轴压缩和压缩-拉伸力学行为以及应变率和侧应力比两个因素对混凝土动态双轴强度及其尺寸效应行为的影响规律,分析与讨论了不同工况下结构尺寸对混凝土动态双轴强度的影响机理。研究结果表明:(1)动态双轴压缩工况下,结构尺寸对混凝土动态双轴压缩强度的影响随应变率增大逐渐被削弱,随侧应力比增大先被削弱而后增强;(2)动态双轴压缩-拉伸工况下,随应变率增大,结构尺寸对混凝土动态主轴压缩强度和动态侧轴拉伸强度的影响均被削弱。随侧应力比增大,结构尺寸对混凝土动态主轴压缩强度的影响被增强,而对混凝土动态侧轴拉伸强度的影响被削弱。(3)逐渐增大的应变率会削弱侧应力比对混凝土双轴强度尺寸效应的影响。
关键词:混凝土;尺寸效应;应变率;侧应力比;动态双轴强度

Abstract

To investigate the effect of structural size on concrete biaxial dynamic failure behavior, a meso-scale modelling approach considering concrete heterogeneity is established. Numerical simulations of cubic concrete specimens having different sizes under different strain rates (10-5/s, 10-2/s and 1/s) and different lateral stress ratios (0, ±0.25, ±0.50, ±0.75, ±1.00 and -∞) are carried out. The mechanical behavior of concrete under dynamic biaxial compression and biaxial compression-tension loads and the influence of strain rate and lateral stress ratio on the dynamic biaxial strength and the corresponding size effect are studied. The mechanism of the size effect on the dynamic biaxial strength is analyzed and discussed. The simulation results indicated that: (1) under dynamic biaxial compression loads, the size effect on dynamic biaxial compressive strength is gradually weakened with the increasing strain rate, and the size effect is first weakened and then strengthened with the increasing lateral stress ratio; (2) under dynamic biaxial compression-tension loads, the size effect on dynamic spindle compressive strength and dynamic lateral tensile strength are both weakened with the increasing strain rate, the size effect on dynamic spindle compressive strength is enhanced with the increasing lateral stress ratio, while the size effect on the dynamic lateral tensile strength is weakened; (3) the increasing strain rate will weaken the influence of the lateral stress ratio on the size effect.
Key words: concrete; size effect; strain rate; lateral stress ratio; dynamic biaxial strength

关键词

混凝土 / 尺寸效应 / 应变率 / 侧应力比 / 动态双轴强度

Key words

concrete / size effect / strain rate / lateral stress ratio / dynamic biaxial strength

引用本文

导出引用
金浏,李健,余文轩,杜修力. 结构尺寸对混凝土双轴动态破坏行为影响细观分析[J]. 振动与冲击, 2022, 41(23): 1-9
JIN Liu, LI Jian, YU Wenxuan, DU Xiuli. Meso analysis for effects of structure size on concrete biaxial dynamic failure behavior[J]. Journal of Vibration and Shock, 2022, 41(23): 1-9

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