长期荷载作用下FRP约束混凝土应力-应变关系分析模型

发布时间：2018-08-18 15:06

【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。
[Abstract]:In order to study the relationship between deformation and stress-strain of FRP (fiber reinforced composite) confined concrete under long term load, the creep data of 8 616 concrete and the shrinkage data of 4 320 concrete were analyzed. GL2000 model and Findley model are selected as creep model of concrete and FRP respectively, and then according to the equilibrium condition and geometric condition of FRP confined concrete, the calculation method of long-term deformation is put forward. Finally, the ultimate stress and strain calculation formula of FRP confined concrete cylinder considering initial stress is adopted. Based on the axial lateral strain relation of Teng model and the active constraint equation of Mander constitutive model, the incremental iteration method is used. An analytical model of stress-strain relationship of FRP confined concrete under long term load is established and compared with the experimental results. The results show that the stress-strain curve of confined concrete obtained by using the proposed long-term deformation calculation method and the stress-strain analysis model of concrete is in good agreement with the experimental curve.
【作者单位】：西南交通大学土木工程学院;西南交通大学交通隧道工程教育部重点实验室;
【基金】：国家重点研发计划(2016YFB0303603-4) 国家自然科学基金项目(51108389)
【分类号】：TU528

【相似文献】