FRP约束超高性能混凝土圆柱轴压本构模型  

Axial Compression Stress-Strain Model for UHPC Cylinders Confined by FRP

作　　者：邓宗才[1] 王义超[1] 

机构地区：[1]北京工业大学城市与工程安全减灾省部共建教育部重点实验室,北京100124

出　　处：《西南交通大学学报》2015年第4期641-647,共7页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金资助项目(51378032);北京市自然科学基金资助项目(8142005)

摘　　要：为研究纤维增强复合材料(FRP)约束超高性能混凝土(UHPC)圆柱体的轴压性能,对30根FRP布约束和3根无约束UHPC圆柱体进行了轴心抗压试验,分析了FRP种类、纤维布层数和约束形式对UHPC轴压性能的影响规律.根据试验结果,同时考虑约束刚度和纤维布极限应变的影响,通过回归得到了约束试件强度和极限应变预测公式,并对Lam-Teng模型中的截距进行了修正.研究结果表明:约束比和侧向约束刚度是影响约束试件强度和极限应变的主要因素;约束试件的应力-应变曲线由抛物线和直线段组成;改进后Lam-Teng模型的拟合优度均值为0.96,能更精确地预测约束试件的应力-应变关系.In order to investigate the axial compression behaviors of FRP （fiber-reinforced polymer） confined UHPC （ultra-high performance concrete ） specimens under axial compression, 30 FRP confined UHPC specimens and 3 unconfined UHPC cylindrical specimens were tested. The effects of FRP types, layers of fiber sheets, and confinement methods （FRP tube or FRP sheet ） on the compression behaviors of confined UHPC were analyzed. Based the test results and considering the confinement ratio and lateral restraint stiffness, new models for predicting the compressive strength and ultimate strain were proposed. In addition, the Lam-Teng model was improved by revising its a parameter. The research results indicate that confinement ratio and lateral restraint stiffness are the major influencing factors of the compressive strength and ultimate strain of confined UHPC, and the stress-strain curve of a confined specimen is consisted of a parabola and a straight line segment. The improved Lam-Teng model has a goodness of fit of 0.96, so it can predict the stress-strain relationship of confined specimens more accurately.

关 键 词：纤维增强复合材料(FRP) 超高性能混凝土(UHPC) 约束混凝土 轴心抗压 应力-应变曲线 

分 类 号：TU375.3[建筑科学—结构工程]