长期荷载作用下FRP约束混凝土应力-应变关系分析模型  

Analysis-oriented stress-strain model of FRP-confined concrete under long-term sustained load

作　　者：潘毅[1,2] 吴晓飞[1] 郭瑞[1] 时胜杰[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]西南交通大学交通隧道工程教育部重点实验室,四川成都610031

出　　处：《建筑结构学报》2017年第10期139-148,共10页Journal of Building Structures

基　　金：国家重点研发计划(2016YFB0303603-4);国家自然科学基金项目(51108389)

摘　　要：为研究长期荷载作用下FRP(纤维增强复合材料)约束混凝土的变形和应力-应变关系,先通过8 616个混凝土徐变数据和4 320个混凝土收缩数据的分析,选择GL2000模型和Findley模型分别作为混凝土和FRP的徐变模型;然后根据FRP约束混凝土的平衡条件和几何条件,提出了长期变形的计算方法;最后采用考虑初始应力的FRP约束混凝土圆柱的极限应力、应变计算公式,并基于Teng模型的轴向-侧向应变关系和Mander本构模型的主动约束方程,采用增量迭代方法,建立了长期荷载作用下考虑初始应力的FRP约束混凝土应力-应变关系的分析模型,并与试验结果进行了对比。研究结果表明,采用提出的长期变形计算方法和混凝土应力-应变分析模型得到的约束混凝土应力-应变曲线与试验曲线吻合较好。In order to study the deformation and stress-strain relationship of FRP （fiber reinforced plastics） confined concrete under a long-term sustained loading, the model GL2000 and model Findley were selected firstly as concrete creep model and FRP creep model, respectively by analyzing 8616 data of concrete creep and 4320 data of concrete shrinkage. Then according to the conditions of static and geometry equilibrium, a method of long-term deformation was proposed. Moreover, an equation for calculating the ultimate compressive strength and strain of FRP confined concrete was suggested by considering the initial stress. Finally based on the axial-lateral strain relationship proposed by Teng and actively-confined concrete model proposed by Mander, an analysis-oriented stress-strain model was built by an incremental-iterative method. It is found that the predicting results of the long-term deformation method and the stress- strain model agree well with the test data.

关 键 词：纤维增强复合材料 约束混凝土 圆柱 初始应力 长期变形 应力-应变关系 分析模型 

分 类 号：TU528.57[建筑科学—建筑技术科学]