混凝土单轴压缩短时蠕变破坏幂律行为研究  

Analysis of Power Law Behavior of Creep Failure of Concrete under Short-Time Uniaxial Compression

作　　者：吴剑锋[1,2] 李慧剑[1] 王彩华[2] 孟德亮[1] 李佶芩 WU Jianfeng;LI Huijian;WANG Caihua;MENG Deliang;LI Jiqin(Key Laboratory of Heavy Equipment and Large Scale Structural Mechanical Reliability,Yanshan University,Qinhuangdao 066004,China;Northeast Petroleum University Qinhuangdao,Qinhuangdao 066004,China)

机构地区：[1]燕山大学河北省重型装备与大型结构力学可靠性重点实验室,秦皇岛066004 [2]东北石油大学秦皇岛校区,秦皇岛066004

出　　处：《硅酸盐通报》2020年第10期3208-3212,3229,共6页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(11072210);秦皇岛市科技计划项目(201902A131);东北石油大学青年科学基金(2018QNQ-10)。

摘　　要：依据Voight经验公式对混凝土蠕变破坏幂律行为进行了理论研究,设计了两种形状、两种配合比的试样,通过单轴压缩分级加载短时蠕变试验对混凝土蠕变破坏幂律行为进行了验证,讨论了幂指数α与混凝土单轴压缩峰值应力、脆性指标、蠕变破坏强度、单位体积吸收能的关联。结果表明:混凝土单轴压缩分级加载短时蠕变破坏会呈现幂律行为;棱柱体试样的幂指数α均高于同配合比B、C的立方体试样;同形状试样的幂指数α随配合比的变化、脆性指标的降低呈降低趋势;同配合比试样的幂指数α随脆性指标的降低呈降低趋势;幂指数α还随混凝土单轴压缩峰值应力的提高、蠕变破坏强度的提高、单位体积吸收能的增大呈降低趋势。Based on Voight’s empirical formula,the power law behavior of creep failure of concrete was studied theoretically.The power law behavior of creep failure of concrete was verified by the short-time creep test of specimens with two shapes and two mixture ratios under uniaxial compression.The relationship between the power index and the peak stress,the brittleness index,creep failure strength and unit volume absorption energy of concrete under uniaxial compression was discussed.The results show that the short-time creep failure of concrete under uniaxial compression is a power law behavior.The power index of prismatic samples is higher than that of cube samples with the same mixture ratio.The power index of the same shape samples decreases with the change of mixture ratio and the decrease of the brittleness index,and the power index of the same mixture ratio samples decreases with the decrease of the brittleness index.The power index also decreases with the increase of peak stress,creep failure strength and unit volume absorption energy.

关 键 词：混凝土 压缩蠕变 高应力 幂律 单位体积吸收能 脆性指标 

分 类 号：TU528.01[建筑科学—建筑技术科学]