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

纤维增强聚合物复合材料加固细长混凝土柱分析与设计进展

• 批准号: RGPIN-2021-02429
• 负责人: Sadeghian, Pedram
• 金额: $ 2.26万
• 依托单位: Dalhousie University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=741045
• 关键词: Advances; Analysis; Design; Slender; Concrete

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.

在过去的三十年中，纤维增强聚合物（FRP）复合材料以其优越的特性在结构工程中出现，用于加固现有结构和建造新体系。frp在短混凝土柱中的使用已被广泛研究，其结果已被转化为设计指南和实践工程师的规范。然而，长（细长）混凝土柱在轴压荷载和后果屈曲破坏引起的显著侧向（二阶）变形下的性能尚未得到足够的深入和广度的研究，无法为开发可靠的设计方程和程序建立一个全面的数据平台。申请人在过去的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，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），该应用程序还获得了最先进的CFI设备，并建立了独特的水平测试装置来测试各种细长的柱。测试装置可以接受广泛的细长柱（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、层压板、管和壳形式的内部和外部加固系统；（二）截面形状，包括矩形截面和圆形截面；(3)长细比；(4)载荷偏心；(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，考虑到广泛的截面、边界条件、材料特性和FRP系统。将理论研究与实验研究相结合，进行全面的参数化研究。参数化研究将面向为统计和可靠性分析建立大数据平台，提出可靠的设计方程和程序，以填补当前CSA设计规范的空白，供制造商和实践工程师使用。该研究项目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。该研究项目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，而且还将为该国老化的基础设施（如桥梁和细长柱的海滨结构）寻求创新和可持续的解决方案。