摘要
采用等应力循环加卸载法和等应变单调加载法,对棱柱体试件进行单轴受压试验获得全珊瑚海水混凝土的应力-应变全曲线,并对两种加载方法进行对比分析。试验结果表明:全珊瑚海水混凝土裂纹贯穿珊瑚骨料继续发展,单轴受压试件的破坏为脆性破坏,典型破坏状态主要为劈裂破坏,其主斜裂缝的倾角θ在65°~70°之间;残余应力与峰值应力的比值在0.292~0.525之间,说明全珊瑚海水混凝土破坏后仍具有较高的残余强度,破坏后强度逐步降低,具有一定的延性;不同强度等级全珊瑚海水混凝土的应力-应变全曲线的上升段趋势基本相似,但是随着强度等级提高,下降段的下降趋势越陡,破坏程度越剧烈;在相同强度等级下,全珊瑚海水混凝土比普通混凝土和轻集料混凝土的脆性更强。
The whole stress-strain curves of coral aggregate concrete were studied by using prismatic specimens under uniaxial compression. The equal stress cycle loading and unloading and equal strain monotonic loading methods were adopted, and the two methods were compared and analyzed. The results show that the crack of coral aggregate concrete directly through coral aggregate continues to spread. Failure of specimens under uniaxial compression is brittle. Typical failure pattern is splitting. The main inclined crack angle is between 65° and 70°. The ratio of residual stress and peak stress is between 0. 292 and 0. 525. It is shown that the damage to the coral aggregate concrete still has a high residual strength. The strength is gradually reduced, and it has certain ductility. The ascending trend of coral aggregate concrete with different strength grades is basically similar. However, with the increase of strength grade, the downtrend of descending stage is steeper, and the damage is more intense. In addition, coral aggregate concrete is more brittle than ordinary concrete and lightweight aggregate concrete with the same strength grade.
作者
达波
余红发
麻海燕
张亚栋
袁银峰
余强
谭永山
糜人杰
DA Bo YU Hongfa MA Haiyan ZHANG Yadong YUAN Yinfeng YU Qiang TAN Yongshan MI Renjie(Department of Civil Engineering, Nanjing University of Aeronautic and Astronautic, Nanjing 210016, China School of Civil Engineering, Qinghai University, Xining 810016, China State Key Laboratory of Disaster Prevention ＆ Mitigation of Explosion ＆ Impact, PLA University of Science and Technology, Nanjing 210073, China Navy Engineering Design and Research Institute, Beijing 100070, China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2017年第1期144-151,共8页
Journal of Building Structures
基金
国家自然科学基金项目(51508272
51678304)
国家重点基础研究发展计划项目(2015CB655102)
关键词
全珊瑚海水混凝土
等应力循环加卸载试验
等应变单调加载试验
单轴受压
应力-应变全曲线
coral aggregate seawater concrete
equal stress cycle loading and unloading experiment
equal strain monotonic loading experiment
uniaxial compression
whole stress-strain curve
