单轴压缩荷载下带冷缝混凝土能量演化试验研究  

Experimental study on energy evolution of concrete with cold joints under uniaxial compression

作　　者：梁达 覃源[1] 寇佳亮[2] 王玉龙 周恒 耿凯强 LIANG Da;QIN Yuan;KOU Jialiang;WANG Yulong;ZHOU Heng;GENG Kaiqiang(School of Water Conservancy and Hydropower,Xi′an University of Technology,Xi′an,Shaanxi 710048,China;School of Civil Engineering and Architecture,Xi′an University of Technology,Xi′an,Shaanxi 710048,China;Power China Northwest Engineering Co.,Ltd.,Xi′an,Shaanxi 710065,China)

机构地区：[1]西安理工大学水利水电学院,陕西西安710048 [2]西安理工大学土木工程与建筑学院,陕西西安710048 [3]中国电建集团西北勘察设计研究院有限公司,陕西西安710065

出　　处：《排灌机械工程学报》2023年第5期481-486,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51679197);中国博士后科学基金资助项目(2014M562524XB)。

摘　　要：带冷缝混凝土受压破坏过程中,伴随着能量的积聚与耗散,通过对不同浇筑龄期间隔和不同弹性模量比下的带冷缝混凝土进行单轴压缩试验,研究其应力-应变曲线、破坏形态、强度和能量演化受龄期间隔和弹性模量比的影响规律,从能量角度对其破坏过程进行研究,建立了带冷缝混凝土应力-应变本构模型;试验结果表明:随弹性模量比的增大,混凝土试样破坏形态由协同破坏逐渐转变为逐层破坏形态,应力-应变曲线主要经历弹性阶段、弹塑性阶段及屈服破坏3个阶段,弹性模量比越大,龄期间隔越长,曲线呈现出越明显的“瘦高状”;弹性模量比越大,龄期间隔越短,单轴压缩下峰前带冷缝混凝土储存可释放弹性应变能越大,总能量越大,且峰值后脆性破坏特征越明显.The compression failure process of concrete with cold joints is accompanied by the accumulation and dissipation of energy.Through uniaxial compression tests on concrete with cold joints under different pouring age intervals and different elastic modulus ratios,the influence of age intervals and elastic modulus ratios on the stress-strain curves,failure mode,strength and energy evolution was stu-died.The failure process of concrete with cold joints was studied from the angle of energy,and the stress-strain constitutive model of concrete with cold joints was established.The test results show that with the increase of elastic modulus ratio,the failure mode of concrete samples gradually changes from colla-borative failure to layered failure mode.The stress-strain curve mainly goes through three stages:elastic stage,elastic-plastic stage and yield failure stage.The larger the elastic modulus ratio,the longer the age interval,and the more obvious the″thin and tall″curve appears.The larger the elastic mo-dulus ratio,the shorter the age interval.Under uniaxial compression,the greater the elastic strain energy released by pre-peak concrete with cold joints,the greater the total energy,and the brittle failure characteristic after the peak is more obvious.

关 键 词：冷缝 单轴压缩试验 应力-应变曲线 本构模型 能量演化 

分 类 号：S277.9[农业科学—农业水土工程]