预应力纤维布约束混凝土圆柱轴压性能分析  

Performances of Circular Concrete Columns Confined with Lateral Pre-tensioned FRP under Axial Loads

作　　者：周长东[1,2] 白晓彬[1] 吕西林[2] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《结构工程师》2013年第1期149-156,共8页Structural Engineers

基　　金：国家自然科学基金项目(50978021);同济大学土木工程防灾国家重点实验室开放基金项目(SLDRCE08-MB-01)

摘　　要：采用环向预应力FRP加固圆形混凝土柱,可以对核心混凝土施加主动约束应力,提高柱的强度和延性。进行了18根混凝土圆柱轴心受压试验研究,采用有限元分析软件ABAQUS,对环向预应力FRP加固混凝土圆柱的轴心受压性能进行了数值模拟分析,提出了此类问题的有限元算法。介绍了利用ABAQUS模拟的建模过程,通过模拟结果分析了环向预应力FRP约束混凝土圆柱在轴心受压状态下的受力特点,得出了试件的峰值强度、峰值应变和应力-应变曲线,模拟结果和试验结果吻合较好,证明了所选取的计算模型的合理性,并分析了模拟值和试验值出现偏差的原因。The active confinement to the core concrete can be provided by lateral pre-tensioned FRP; and therefore strength and ductility of circular concrete columns confined with lateral pre-tensioned FRP can be enhanced. To investigate the axial compressive performance of circular concrete columns confined with lateral pre-stressed FRP, 18 specimens were tested under axial compression. Along with the experiments, a finite element method was proposed to simulate the mechanical behavior of circular concrete columns confined with lateral pre-stressed FRP by using ABAQUS. Modeling process of the ABAQUS was described. Confinement effects of lateral pre-stress were studied by comparing the ultimate strength, ultimate strain and the stressstrain curves of the specimens obtained from the testing and numerical simulation, which have good agreement. Reasons for the difference were further analyzed.

关 键 词：混凝土圆柱 环向预应力FRP 主动约束 轴心受压 有限元分析 

分 类 号：TU378.3[建筑科学—结构工程]