摘要
通过对混凝土施加围压,使单轴受压混凝土的裂缝发展受到限制,从而研究混凝土在接近无裂纹发展状态(无损伤产生的理想状态)下的受压性能。本文在MTS815.02岩石电液伺服系统上完成了三轴应力比σ1∶σ2∶σ3=(-α)∶(-α)∶(-1)(α=0.15,0.18,0.19,0.20,0.22)作用下的混凝土单调、循环加卸载受压的常规三轴试验。研究了不同围压比对混凝土受压应力-应变关系的影响规律,以及围压对混凝土裂缝发展的限制作用,得出了一些与同类试验不同的结果,混凝土理想无损伤发展状态的受压应力-应变关系曲线被提出,并通过试验首次研究了理想无损伤发展状态下的混凝土循环加卸载的应力-应变关系,系统地分析了围压对混凝土受压性能的影响规律。
Exerting surrounding pressure can prevent crack growing in a uniaxially compressed concrete specimen. The behavior of concrete in which there is no crack propagation （called ideal state without damage growth） is researched in this paper. Uniaxial and triaxial monotonic ~ cyclic compressive experiments with various surrounding pressure ratios are carried out on MTS 815.02. The surrounding pressure ratios are varied from 0.15 to 0.22. The influence of surrounding pressure ratio on the compressive stress-strain relationship and the restriction effect of surrounding pressure on the damage growth are investigated. Some different results from the experiments of the same kinds are obtained. The ideal stress-stain curve of concrete which is not influenced by internal damage is proposed. The cyclic loading-unloading stress-stain relationship of concrete under ideal state without damage growth is first studied in this paper. The influence of surrounding pressure to the loadresponse property of compressed concrete is completely researched.
出处
《实验力学》
CSCD
北大核心
2007年第2期142-148,共7页
Journal of Experimental Mechanics
关键词
混凝土
围压比
理想应力-应变曲线
损伤本构关系
concrete
surrounding pressure ratio
ideal stress-strain curve
damage constitutive relation
