• (1)2008-2022年连续15年年被中国情报信息研究所评价中心评为“中国科技核心期刊”
  • (2)2019-2024年连续三届被中国科学院文献情报中心中国科学引文数据库CSCD(核心库)收录
  • (3)2021年入编北京大学图书馆《中文核心期刊要目总览》2020年版
  • (4)2020-2022连续三年入选《科技期刊世界影响力指数(WJCI)报告》
何一洋, 黄耀英, 谢 同, 李泽鹏, 丁胜勇.基于实测徐变的水工混凝土细观力学参数反演水资源与水工程学报[J].,2023,34(2):163-170
基于实测徐变的水工混凝土细观力学参数反演
Inversion analysis of meso-mechanical parameters of hydraulic concrete based on measured creep change
  
DOI:10.11705/j.issn.1672-643X.2023.02.21
中文关键词:  水工混凝土  细观力学参数  参数反演  徐变度  泊松比  弹性模量
英文关键词:hydraulic concrete  meso-mechanical parameter  parameter inversion  creep variability  Poisson’s ratio  elastic modulus
基金项目:国家自然科学基金项目(52179135、51779130)
作者单位
何一洋1, 黄耀英1, 谢 同2, 李泽鹏1, 丁胜勇1 (1.三峡大学 水利与环境学院 湖北 宜昌 443002 2.三峡新能源阳江发电有限公司 广东 阳江 529599) 
摘要点击次数: 448
全文下载次数: 295
中文摘要:
      现有混凝土细观力学参数反演分析一般是基于实测轴向应变进行,而荷载作用下的混凝土试件存在明显的泊松效应,因此联合实测纵、横向应变优化反演的力学参数更能反映材料的真实性能。首先开展了不同加载龄期的水工混凝土单轴压缩徐变泊松比试验,然后基于加荷和持荷阶段的实测纵、横向应变,采用“正交设计-神经网络-细观有限元模型”相结合的方法,反演获得了骨料与砂浆的弹性力学参数;进而将混凝土实测徐变度作为砂浆徐变度的初始值,反演获得持荷阶段砂浆徐变度及徐变泊松比;最后对比分析了反演获得的砂浆徐变度和混凝土徐变度。结果表明:骨料、砂浆的力学参数与混凝土力学参数存在差异,基于实测应变反演获得的骨料、砂浆弹性泊松比在0.13~0.20之间,砂浆徐变泊松比为0.125;相同加载龄期下,砂浆的徐变特性与混凝土的徐变特性相似且砂浆的徐变度要大于混凝土的徐变度,反演获得的砂浆徐变度约为混凝土徐变度的2.5倍。
英文摘要:
      The existing inversion analysis of the mesoscopic mechanical parameters of concrete is generally based on the measured axial strain; however, concrete specimens usually show obvious Poisson effect under loads. So, the mechanical parameters optimized by the combination of measured longitudinal and transverse strain inversion can better reflect the real performance of the material. Here, the uniaxial compression creep Poisson’s ratio test of hydraulic concrete with different loading ages was conducted, and then the elastic parameters of aggregate and mortar were inverted using the combined method of “orthogonal design-neural network-mesoscopic finite element model”, based on the measured longitudinal and transverse strains of the loading and load holding stages. Then, the measured creep variability of concrete was taken as the initial value of the mortar, and the creep variability and the creep Poisson’s ratio of the mortar at the load holding stage were obtained by inversion. Finally, the creep variability of mortar and the creep variability of concrete obtained by inversion were compared and analyzed. The results show that there is a difference between the mechanical parameters of aggregate & mortar and concrete, the elastic Poisson’s ratio of aggregate and mortar obtained from measured strain inversion is between 0.13 and 0.20, and the creep Poisson’s ratio of mortar is about 0.125; under the same loading age, the creep characteristics of mortar are similar to that of concrete and the creep variability of mortar is larger than that of concrete, which is about 2.5 times greater according to this research.
查看全文  查看/发表评论  下载PDF阅读器
关闭