钢纤维混凝土压-剪复合性能及损伤本构关系  

MECHANICAL PROPERTY AND DAMAGE CONSTITUTIVE MODEL OF STEEL FIBER REINFORCED CONCRETE UNDER COMBINED COMPRESSION-SHERA LOADING

作　　者：杨海峰[1] 杨超 蒋毅 刘成丽 YANG Hai-feng;YANG Chao;JIANG Yi;LIU Cheng-li(Key Laboratory of Disaster Prevention and Engineering Safety of Guangxi,College of Civil and Architecture Engineering,Guangxi University,Guangxi,Nanning 530004,China)

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

出　　处：《工程力学》2023年第4期144-151,共8页Engineering Mechanics

基　　金：国家自然科学基金项目(52178123)。

摘　　要：为研究钢纤维混凝土的压-剪复合受力性能及损伤模型,以钢纤维体积率、压应力比为参数,完成了60个钢纤维混凝土试件的直剪和压-剪试验,分析了各参数对剪切强度和峰值剪切位移的影响,推导了钢纤维混凝土在压-剪复合受力下的损伤全曲线模型,分析了损伤演化规律,提出了压-剪强度计算式。结果表明:剪切强度和峰值剪切位移均随压应力比的增大而增大。随着钢纤维体积率的增加,剪切强度呈现先增后减的趋势,峰值剪切位移规律不明显。压应力比的增大显著减缓了损伤发展;提出的损伤本构模型和压-剪强度公式计算结果与试验值吻合较好。In order to study the mechanical behavior and damage model of steel fiber reinforced concrete(SFRC)under compression-shear loading(C-S),60 SFRC specimens were tested with different steel fiber volume ratio()and compressive stress ratio(k).The influence of each parameter on the shear strength and peak displacement is analyzed.The damage model of SFRC specimens under C-S is deduced and the evolution of shear damage is analyzed.Then the calculation formula of compression-shear strength was proposed.The results show that the shear strength and peak displacement of SFRC specimens increase with k.As increases,the shear strength increases initially and then decreases,while the tendency of the peak shear displacement is not obvious.The increase of k significantly reduces the development of concrete damage.The proposed damage constitutive model and shear strength formula prove to agree well with the experimental results.

关 键 词：钢纤维混凝土 压剪复合受力 剪切强度 峰值剪切位移 损伤模型 

分 类 号：TU502[建筑科学—建筑技术科学]