橡胶粗细集料含量对FRP约束橡胶混凝土应力-应变关系的影响  

Effect of coarse and fine rubber aggregate content on stress-strain relationship of FRP confined rubber concrete

作　　者：曹玉贵[1,2] 铉志莹 谢青华 李恒 CAO Yugui;XUAN Zhiying;XIE Qinghua;LI Heng(Hubei Key Laboratory of Roadway Bridge and Structure Engineering,Wuhan University of Technology,Wuhan,Hubei 430070,China;Sanya Science and Education Innonation Park,Wuhan University of Technology,Sanya,Hainan 572025,China;China Gezhouba Group Investigation&Design Co.,Ltd.,Wuhan,Hubei 430000,China;China Municipal Engineering Northwest Design and Research Institute Co.,Ltd.,Lanzhou,Gansu 730000,China)

机构地区：[1]武汉理工大学道路桥梁与结构工程湖北省重点实验室,湖北武汉430070 [2]武汉理工大学三亚科教创新园,海南三亚572025 [3]中国葛洲坝集团勘测设计有限公司,湖北武汉430000 [4]中国市政工程西北设计研究院有限公司,甘肃兰州730000

出　　处：《江苏大学学报（自然科学版）》2024年第5期598-605,共8页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51808419);武汉理工大学三亚科教创新园开放基金资助项目(2021KF0005);中建市政西北院课题(XBSZKY2036)。

摘　　要：为研究橡胶粗细集料体积分数对纤维增强复合材料(fiber reinforced polymer, FRP)约束橡胶混凝土应力-应变关系的影响,提出了橡胶粗细集料体积替换率的概念,并通过收集已发表文献的110组应力-应变关系试验曲线,分析了橡胶粗细集料体积替换率对FRP约束不同截面橡胶混凝土柱应力-应变关系关键参数的影响,基于分析结果建立了FRP约束橡胶混凝土的应力-应变关系模型和抗压强度模型,两个模型中均考虑了橡胶粗细集料体积替换率和橡胶混凝土截面形状的影响.模型评估结果表明:随着橡胶粗细集料体积替换率、FRP约束应力比和截面倒角半径比的增加,FRP约束橡胶混凝土的抗压强度均呈增大的趋势;建立的抗压强度模型可准确预测橡胶颗粒取代部分细集料或粗细集料的FRP约束橡胶混凝土抗压强度,平均误差仅为1.03;建立的应力-应变关系模型能够较好预测FRP约束橡胶混凝土的应力-应变关系曲线变化.To investigate the effects of volume replacement rate of rubber coarse and fine aggregates on the stress-strain curve,the concept of volume replacement rate of rubber coarse and fine aggregates was defined.By collecting 110 existing experimental stress-strain curves from published literatures,the effects of rubber coarse and fine aggregate volume replacement rate on the key parameters of stress-strain relationship of fiber reinforced polymer(FRP)confined rubber concrete with different sections were analyzed.Based on the analysis results,the stress-strain relationship model and compressive strength model of FRP confined rubber concrete were established.The factor effects of the volume replacement rate of rubber coarse and fine aggregates and the cross-sectional shape of rubber concrete were considered in the proposed models.The model evaluation results show that the compressive strength ratio of FRP confined rubber concrete is increased with the increasing of the volume replacement rate of rubber coarse and fine aggregates,the FRP confinement stress ratio and the cross-sectional corner radius ratio.The proposed compressive strength model can accurately predict the compressive strength of FRP confined rubber concrete with rubber particles replacing part of fine aggregate or coarse and fine aggregate,and the average error value is 1.03.The predicted curves of the proposed stress-strain model are consistent with the experimental stress-strain curves of FRP confined rubber concrete.

关 键 词：FRP约束橡胶混凝土 橡胶粗细集料体积替换率 截面形状 应力-应变关系 抗压强度 

分 类 号：TU501[建筑科学—建筑技术科学] TU528.41