三向受压状态下轻骨料混凝土的变形性能及损伤分析  

Deformation performance and damage analysis of lightweight aggregate concrete under three-dimensional compression

作　　者：陈宇良[1,2] 李浩 吴辉琴 张绍松[1] CHEN Yuliang;LI Hao;WU Huiqin;ZHANG Shaosong(College of Civil Engineering and Architecture,Guangxi University of Science and Technology,Liuzhou 545006,Guangxi,China;Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,Nanning 530004,Guangxi,China)

机构地区：[1]广西科技大学土木建筑工程学院,广西柳州545006 [2]广西防灾减灾与工程安全重点实验室,广西南宁530004

出　　处：《实验力学》2021年第5期668-676,共9页Journal of Experimental Mechanics

基　　金：国家自然科学基金(51908141);广西科技基地和人才专项(AD19110068);广西自然科学基金(2019GXNSFBA245030);广西高校中青年教师科研基础能力提升项目(2019KY0361);广西重点实验室开放课题项目(2019ZDK038)。

摘　　要：以侧向压力为变化参数,共设计了33个Φ100mm×200mm粉煤灰陶粒轻骨料混凝土圆柱体试件进行常规三轴试验,试验观察了三轴受压试件的表观变化及其破坏形态,深入分析了轻骨料混凝土的初始弹性模量、峰值应变、延性系数、耗能系数等力学性能以及损伤演变过程。研究结果表明:在单轴受压时,轻骨料混凝土表现为纵向劈裂破坏,在三轴受压时表现为斜向劈裂破坏;增大侧向压力可显著影响轻骨料混凝土的变形性能;轻骨料混凝土的变形延性性能随着侧向压力的增大呈现先增大后减小的趋势;侧向压力越大,轻骨料混凝土损伤曲线斜率越小,损伤出现越晚,发展越缓慢。The mechanical performance of 33 fly ash ceramsite lightweight aggregate concrete specimens withΦ100×200mm subjected to multiaxial compression is studied.The apparent changes and stress failure modes of the specimens after the triaxial test are observed.The performance parameters including initial elastic modulus,peak strain,ductility coefficient,energy dissipation coefficient and the damage evolution process of lightweight aggregate concrete are analyzed deeply.The results show that,the longitudinal splitting failure of lightweight aggregate concrete exists under uniaxial compression and the oblique splitting failure appears under triaxial compression;the lateral confinement can effectively improve the bearing capacity and deformation performance of lightweight aggregate concrete;the ductility of lightweight aggregate concrete increases first and then decreases with the increase of lateral confinement;with the increase of lateral confinement,the slope curves become smaller,and the damage development of lightweight aggregate concrete becomes slower.

关 键 词：轻骨料混凝土 粉煤灰陶粒 三轴受压 变形性能 损伤分析 

分 类 号：TU528.2[建筑科学—建筑技术科学]