【作者】 崔海琴；

【导师】 易志坚；

【作者基本信息】 重庆交通大学 ， 桥梁与隧道工程， 2007， 硕士

【摘要】 FRP(Fiber Reinforced Plastics)在旧结构加固中以提高结构承载力——“增强”为目的的试验、应用已经广泛开展,对于FRP约束混凝土结构作为新建结构增强、增韧作用的研究处于初期研究阶段。初期研究表明采用FRP约束钢筋混凝土柱,能够最大限度地发挥混凝土、钢筋和FRP的力学性能,大大地提高约束混凝土结构的承载力和改善其延性性能。为了更好地研究混凝土材料本身受FRP约束后的性能,本文进行FRP约束素混凝土柱在单调轴心受压作用下的试验研究。试验从改善结构延性的角度系统地研究了不同的FRP类型,不同截面形式的柱、不同的包裹方式和包裹层厚的FRP约束混凝土柱的力学性能,得到了FRP约束混凝土柱的受力规律,并采用有限元软件验证约束混凝土的增强增韧机理的,为FRP约束混凝土柱的新结构设计提供了目标和方法。同时,为了考察结构(或构件)在经过一次或多次如地震等随机或有规律地加卸作用后的使用性能,本文还对二次加载后的承载和延性性能进行了初步研究,研究表明FRP约束混凝土柱构件的强度、刚度没有降低,延性随着混凝土不可恢复塑性变形的产生,有所降低,但整个构件还能够满足设计要求。更多还原

【Abstract】 For the purpose of enhancing the old structure capacity, the experiments and applications of FRP used to enhance capacity have been carried out extensively. While the research of FRP used to enhance reinforcement and ductility of new concrete structure is in the early stage. Early study shows that FRP confined concrete columns as the new structure can play mechanical properties of concrete, steel and FRP to the maximum, and greatly improve capacity of the binding concrete structure and its ductility. In order to study properties of concrete material itself confined by the FRP, the experimental research of FRP confined concrete columns under monotonously axial compression was carried out in the paper.From the perspective of improving the structure ductility, the experiment systematically studied the mechanical performance of FRP confined columns with different types of FRP, sections, warpping method and layers, got the mechanical law of FRP confined columns, verified the enhancing mechanism of FRP confined columns in capacity and ductility by using FEM software and offered the design objectives and methods of the new structure of FRP confined column. Meanwhile, to inspect the service performance of structure (or elements) under one or more such as earthquakes and other random or regularly loading-and-unloading force, the capacity and ductility performance of FRP confined concrete columns under secondary loading were also preliminarily studied. The study shows strength and stiffness of FRP confined concrete columns are not reduced, the ductility has been reduced with the un-recoverable concrete plastic deformation, but the entire component still meets the design requirements.更多还原