长江科学院院报 ›› 2017, Vol. 34 ›› Issue (3): 130-133.DOI: 10.11988/ckyyb.20150719

• 水工结构与材料 • 上一篇    下一篇

应力空间下基于区间搜索法的混凝土动态损伤临界点确定

吴彬1,2,胡伟华2,3,文沛军4   

  1. 1.湖北工业职业技术学院 建筑工程系, 湖北 十堰 443000;
    2.三峡地区地质灾害与生态环境湖北省 协同创新中心 ,湖北 宜昌 443002;
    3.十堰市建筑设计研究院, 湖北 十堰 443000;
    4.五矿二十三冶建设集团第一工程有限公司,湖南 湘潭 411100
  • 收稿日期:2015-08-31 出版日期:2017-03-01 发布日期:2017-03-10
  • 通讯作者: 胡伟华(1988-),男,湖南益阳人,硕士,助理工程师,主要从事结构抗震设计和混凝土材料研究,(电话)18772803749(电子信箱)464913988@qq.com。
  • 作者简介:吴 彬(1989-),女,湖北十堰人,硕士,助理工程师,主要从事混凝土材料研究,(电话)18772846370(电子信箱)1660621628@qq.com。

Determining the Critical Point of Concrete’s Dynamic Damage Using Interval Search Method under Stress Space

WU Bin1,2,HU Wei-hua2,3,WEN Pei-jun4   

  1. 1.Civil Engineering Department, Hubei Industrial Polytechnic, Shiyan 443000, China;
    2. Hubei Provincial Collaborative Innovation Center for Geo-hazards and Eco-environment in Three Gorges Area, Yichang 443002, China;
    3.Shiyan Architectural Design Institute, Shiyan 443000, China;
    4.The First Engineering Co., Ltd. of the 23rd Metallurgical Construction Group, Minmetals, Xiangtan 411100, China
  • Received:2015-08-31 Published:2017-03-01 Online:2017-03-10

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摘要： 为对混凝土损伤阶段进行划分,并确定损伤界点,对标准立方体试件进行了不同应变速率(10-5,10-4,10-3,10-2/s)下的单轴压缩试验,定义以混凝土弹性模量为参量的损伤变量,并在应力空间下对混凝土损伤演化规律及损伤界点随应变速率的变化规律进行了深入分析。研究结果表明:①损伤界点应力水平随着应变速率的提高而上升,应变速率的提高使得损伤第1界点与第2界点向着应力较高处推移;②随应变速率的提高,损伤第1阶段区间长度增加,第3阶段区间长度减小,但应变速率的变化对损伤第2阶段影响甚微,且第2阶段应力区间长度在0.3左右。

关键词: 混凝土, 动态损伤, 临界点, 区间搜索, 应力空间

Abstract: Uniaxial compression test was carried out on standard cube specimens under different strain rates (10-5, 10-4, 10-3, 10-2/s), and damage variable was defined with concrete elastic modulus as the parameter. Damage evolution rules and variation of critical point of damage with strain rate were analyzed under stress space. Results show that with the increase of strain rate, 1) the stress level at critical point of damage rises, and the first and second critical points move to the positions of higher stress level; 2) the interval length of first phase of damage increases and the interval length of third phase reduces, but the change of strain rate has little effect on the interval length of the second phase, which remains about 0.3.

Key words: concrete, dynamic damage, critical point, interval search, stress space

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