长江科学院院报Issue(10)：116-120,5.DOI:10.11988/ckyyb.20140863
循环加载下塑性混凝土的应力－应变曲线分析
Stress-strain Curves of Plastic Concrete under Cyclic Loading
摘要
Abstract
Previous researches on the stress-strain curve of plastic concrete are focused on the curve in the absence of preloading.In this paper,compressive strength and elastic modulus tests were conducted on cylinder and pris-moid concrete specimens poured with different mix proportions.The characteristics of the stress-strain curve,the stress-strain curves in the presence of preloading and in the absence of preloading and under cyclic loading were re-spectively analyzed.Moreover,the stress-strain curves with preloading and no preloading were compared.Through analysis on the slope of the curves,micropores were proved to exist in the concrete,and how the number of cycles during preloading affecting the curves was obtained.The results show that the rise stage of stress-strain curves of plastic concrete is significantly different from that of normal concrete,and the slope of stress-strain curves of pre-loading stage firstly increases then decreases,whereas the slope of stress-strain curves always increases at none-pre-loading stage.At the same time,we can macroscopically understand the existence of inner micro pores in the speci-mens,and the number of preloading cycles has a little effect on stress-strain curves.The results show that the rise of stress-strain curves of plastic concrete is significantly different than those of normal,the slope of stress-strain curves of preloading firstly increases then decreases,and the slope of stress-strain curves of no preloading has been in-creased.At the same time,we can understand the macro of the specimens,and number of preloading has no effect on stress-strain curves.The results have reference significance to the scientific and engineering applications.The re-sults can be referenced for the scientific research and engineering applications of plastic concrete.关键词
塑性混凝土/循环加载/弹性模量/应力-应变曲线/峰值应力Key words
plastic concrete/cyclic loading/elastic modulus/stress-strain curve/peak stress分类
建筑与水利引用本文复制引用
刘璐璐,常芳芳,解伟,王雪奎..循环加载下塑性混凝土的应力－应变曲线分析[J].长江科学院院报,2015,(10):116-120,5.基金项目
中央级公益性科研院所基本科研业务费专项资金项目 （）
