张昆航,王海波,涂劲,李春雷,钟红.全级配碾压混凝土单轴动态拉伸试验研究[J].中国水利水电科学研究院学报,2021,19(3):290-300
全级配碾压混凝土单轴动态拉伸试验研究
Dynamic tensile test of fully-graded roller compacted concrete
投稿时间:2020-08-04  
DOI:10.13244/j.cnki.jiwhr.20200159
中文关键词:  碾压混凝土  全级配  单轴拉伸  动态性能  应变速率  抗拉强度
英文关键词:roller compacted concrete(RCC)  fully-graded  uniaxial tensile  dynamic properties  strain rate  tensile strength
基金项目:国家重点研发计划项目(2016YFC0401807)
作者单位
张昆航 中国水利水电科学研究院, 北京 100048 
王海波 中国水利水电科学研究院, 北京 100048 
涂劲 中国水利水电科学研究院, 北京 100048 
李春雷 中国水利水电科学研究院, 北京 100048 
钟红 中国水利水电科学研究院, 北京 100048 
摘要点击次数: 248
全文下载次数: 493
中文摘要:
      大坝混凝土动态性能是影响混凝土高坝抗震安全的关键因素之一,在地震作用下重力坝的破坏主要发生在坝头、坝踵及坝体局部拉应力较大的区域,开展全级配碾压混凝土动态拉伸试验研究是为满足不断深化的碾压混凝土大坝抗震研究需求。本文使用中国水利水电科学研究院的大型动、静态材料试验机对全级配碾压混凝土试件开展单轴动态拉伸试验研究。试验混凝土全部采用实际工程所用材料进行浇筑,龄期180 d,全级配碾压混凝土试件为圆柱体,直径450 mm,长度1350 mm。根据大坝结构的振动频率和地震动特性,试验共设置4组,应变速率分别为10-6/s、10-4/s、5×10-4/s和10-3/s,其中10-6/s为拟静态应变速率。分析试验结果发现,碾压混凝土的抗拉强度增长率和应变速率可近似表达为对数线性关系,极限拉应变和吸能能力随应变速率的增加而增加,抗拉弹性模量受到应变速率的影响不大。
英文摘要:
      The dynamic performance of the dam concrete is one of the key factors affecting the safety of the high concrete dam. The destruction of gravity dams under the earthquakes mainly occurs in areas with large tensile stresses on the dam head, heel and dam body. The dynamic properties of RCC are of great significance for the seismic analysis of RCC dams. In this paper, uniaxial tensile tests at different strain rates were performed on an MTS servo controlled testing machine. The test concrete is all poured with materials used in actual project,and the age is 180 d. The specimen is a cylinder with a diameter of 450 mm and a length of 1350 mm. The test set a total of 4 sets of strain rates of 10-6/s,10-4/s,5×10-4/s and 10-3/s, of which 10-6/s is the quasi-static strain rate. The analysis of the experimental results found that the logarithmic relationship between the tensile strength and the strain rate is linear, and the ultimate strain and energy absorption capacity increase with the increase of the strain rate.
查看全文  查看/发表评论  下载PDF阅读器
关闭