Weibull统计理论的参数对混凝土全曲线模型的影响  

Application of Weibull Statistical Theory in Concrete's Parameter Curve Model

作　　者：潘青松[1] 彭刚[1] 胡伟华[1] 徐鑫[1] 

机构地区：[1]三峡大学土木与建筑学院,湖北宜昌443002

出　　处：《长江科学院院报》2015年第4期120-124,共5页Journal of Changjiang River Scientific Research Institute

摘　　要：为了解混凝土在不同加载速率下的力学特性,采用微机控制电液伺服大型多功能动静力三轴仪,对强度等级为C15、边长为150 mm的立方体混凝土试件在不同加载速率为10-5/s,10-4/s,10-3/s,5×10-3/s下进行了单轴压缩试验,对不同加载速率下单轴压缩混凝土的抗压强度、变形、基于修正后的Weibull统计理论的应力应变全曲线模型参数等进行了研究和分析。结果表明:修正后的Weibull统计理论模型能较好地拟合混凝土试件在不同加载速率下的全曲线模型;材料的强度硬化特性可以通过Weibull本构模型中的参数m和E值表征;应变软化特性可以通过Weibull本构模型中的参数c值表征。In order to understand the mechanical properties of concrete under different loading rates,we conducted uniaxial compression test on cubic concrete specimens （strength C15,side length 150mm）under different loading rates （10 -5 /s,10 -4 /s,10 -3 /s,5 ×10 -3 /s）.The test was carried out by micro-computer controlled electro-hydrau-lic servo static and dynamic multifunctional triaxial apparatus.The compressive strength of concrete under uniaxial compression,deformation,and stress-strain curve model parameters based on the statistical theory of modified Weibull were studied and analyzed.Results revealed that the modified Weibull strain curve model parameters well fit the complete curve model of concrete specimens under different loading rates.The strength hardening properties could be characterized by the values of parameter m and E in the Weibull constitutive model,and the strain soften-ing behavior can be expressed by parameter c in the constitutive Weibull model.

关 键 词：不同加载速率 混凝土全曲线 Weibull统计理论参数 强度硬化特性 应变软化特性 

分 类 号：TU528[建筑科学—建筑技术科学]