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）复合材料已出现在结构工程中，具有上级特性，用于加固现有结构和建造新系统。FRP在混凝土短柱中的应用已经得到了广泛的研究，研究结果已经转化为设计指南和实践工程师的规范。然而，长（细长）混凝土柱的性能与显着的横向（二阶）变形引起的轴向压缩载荷和后果屈曲破坏尚未进行调查所需的深度和广度，以建立一个全面的数据平台，可靠的设计方程和程序的发展。申请人在过去五年中为细长柱领域做出了贡献，并准备将研究提升到一个新的水平，从而在该领域取得重大进展。作为可持续基础设施领域的加拿大研究主席（Tier 2），该应用还获得了最先进的CFI设备，并建立了独特的水平测试装置，以测试各种细长柱。测试装置可以接受各种细长柱（实际上长达15 m）和不同的横截面几何形状。 在本研究计画中，大型细长柱将承受偏心轴压。将考虑以下参数：（1）FRP筋、层压板、管和壳形式的内部和外部加固系统;（2）横截面形状，包括矩形和圆形截面;（3）细长比;（4）荷载偏心率;（5）配筋率;（6）FRP强度和模量。该研究计划还将包括基于二阶变形的综合理论研究，考虑广泛的横截面，边界条件，材料特性和FRP系统。理论研究将根据实验研究进行验证，以进行全面的参数研究。参数研究将面向创建用于统计和基于可靠性的分析的大型数据平台，以提出可靠的设计方程和程序，以填补制造商和执业工程师当前CSA设计规范的空白。该研究计划还将为培养掌握先进技术的高素质人才提供一个强大的平台。该研究计划的成果不仅将有助于提升加拿大在细长柱和相关先进技术领域的领导地位，而且还将为该国恶化的基础设施寻求创新和可持续的解决方案，如桥梁和细长柱的滨水结构。

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.