摘要
利用岩石力学试验系统(RMT)对负温下钢纤维混凝土进行了单轴压缩实验,测得了-5℃、-10℃、-15℃、-20℃下钢纤维混凝土的应力-应变曲线、杨氏模量、极限应力、泊松比等。实验结果表明材料的强度、杨氏模量随温度的下降而上升,尤其是当温度由-10℃下降至-15℃时,这些物理量变化特别显著,之后它们将逐渐趋于某一稳定值。本文对钢纤维混凝土力学性能的温度效应进行了分析并对实验结果进行了细观上的讨论。最后针对负温钢纤维混凝土应力-应变曲线的特点,基于塑性力学和损伤力学理论,建立了负温钢纤维混凝土的含损伤本构方程。该方程物理概念清晰,形式简单,具有一定的应用参考价值。
The axial compression experiments of the Steel Fiber Reinforced Concrete （SFRC） at minus centigrade were conducted by RMT system, and the Stress-Strain curves, Yang＇s modulus, the elastic limit stresses, the elastic limit strains and Poission＇s ratios were determined at -5℃,-10℃ ,-15℃, -20℃ respectively. The experimental results show that the strengths and the Yang＇s modulus of SFRC at minus centigrade were increasing with the temperature decreasing, especially in the range of -10℃ - 15℃, the physical quantities increase greatly, and then they become stabilization gradually and reach some steady value. The minus centigrade effects on SFRC＇ mechanical behaviors were analyzed and the results of experiments were discussed in micro point of view. Finally according to the characteristics of the Stress-Strain curves of the SFRC at minus centigrade, on the foundation of Plastic Mechanics and Damage Mechanics, the constitutive equation considering damage was established. The constitutive equation is clear in physical conception and simple in expression form, thus it is available in practical applications.
出处
《实验力学》
CSCD
北大核心
2006年第3期339-344,共6页
Journal of Experimental Mechanics
关键词
负温
钢纤维混凝土
实验
损伤
本构模型
minus centigrade
steel fiber reinforced concrete
experiment
damage~ constitutive model
