Advances in Analysis and Design of Slender Concrete Columns Reinforced with Fiber-Reinforced Polymer Composites

在过去的三十年里，纤维增强聚合物(FRP)复合材料在结构工程中应运而生，它在加固既有结构和构建新体系方面具有优越的特点。对FRPS在混凝土短柱中的应用进行了广泛的研究，其结果已被转化为设计指南和规范，供执业工程师使用。然而，对于在轴压荷载和屈曲破坏作用下产生显著侧向(二阶)变形的混凝土长(长)柱的性能，还没有得到所需的深度和宽度的研究，以建立一个全面的数据平台来制定可靠的设计方程和程序。申请人在过去五年中为细长圆柱领域做出了贡献，并准备将研究提升到下一个水平，从而在该领域取得重大进展。作为可持续基础设施的加拿大研究主席(Tier 2)，该应用程序还购买了最先进的CFI设备，并构建了独特的水平测试装置来测试各种细长的柱子。该测试装置可以接受范围广泛的细长柱(实际上长达15米)和不同的横截面几何形状。在本研究方案中，大型细长柱将承受轴外(偏心)轴压荷载。将考虑以下参数：(1)FRP筋、层合板、管和壳形式的内部和外部配筋系统；(2)包括矩形和圆形截面的截面形状；(3)长细比；(4)荷载偏心距；(5)配筋率；(6)FRP强度和模数。该研究计划还将包括基于二阶变形的全面理论研究，考虑了广泛的横截面、边界条件、材料特性和FRP系统。理论研究将与实验研究进行验证，以进行全面的参数研究。参数研究将致力于创建用于统计和基于可靠性分析的大数据平台，以提出可靠的设计公式和程序，以填补当前CSA设计规范的空白，供制造商和执业工程师使用。该研究计划还将为培养掌握先进技术的高素质人才提供强有力的平台。该研究计划的成果不仅将使加拿大在细长柱和相关先进技术领域处于领先地位，还将为该国日益恶化的基础设施寻求创新和可持续的解决方案，例如具有细长柱的桥梁和滨水结构。

In the past three decades fiber-reinforced polymer (FRP) composites have emerged in structural engineering with superior characteristics for the strengthening of existing structures and the construction of new systems. The use of FRPs in short concrete columns have been extensively investigated and the outcomes have been translated into design guidelines and codes for practicing engineers. However, the performance of long (slender) concrete columns with significant lateral (second-order) deformations induced by axial compression loading and consequence buckling failure have not been investigated with required depth and breadth to establish a comprehensive data platform for the development of reliable design equations and procedures. The applicant has contributed to the field of slender columns in the past five years and is ready to take the research to the next level creating a significant advancement in the field. As Canada Research Chair (Tier 2) in Sustainable Infrastructure, the application has also acquired a state-of-the-art CFI equipment and built a unique horizontal test setup to test a variety of slender columns. The test setup can accept a broad range of slender columns (virtually up to 15 m long) and different cross-sectional geometries. In this research program, large-scale slender columns will be under out of axis (eccentric) axial compression loading. The following parameters will be considered: (1) internal and external reinforcement systems in forms of FRP bars, laminates, tubes an shells; (2) shape of cross-section including rectangular and circular sections; (3) slenderness ratio; (4) load eccentricity; (5) reinforcement ratio; and (6) FRP strength and modulus. The research program will also include a comprehensive theoretical study based on the second-order deformations considering a broad range of cross sections, boundary conditions, material properties, and FRP systems. The theoretical study will be verified against the experimental study to perform a comprehensive parametric study. The parametric study will be geared toward creation of large data platform for statistical and reliability-based analyses to propose reliable design equations and procedures to fill the gaps of current CSA design codes for manufacturers and practicing engineers. The research program will also provide a strong platform for training highly qualified personnel skilled in advanced technologies. The outcomes of the research program not only will serve to elevate Canada to a leadership position in the area of slender columns and associated advanced technologies, but also will seek innovative and sustainable solutions for the country's deteriorated infrastructure, such as bridges and water front structures with slender columns.