Strut-and-Tie Method for GFRP-RC Deep Members

IF 3.6 3区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Zahid Hussain, Antonio Nanni
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Abstract

The current code provisions in ACI 440.11 are based on the flexural theory that applies to slender members and may not represent the actual structural behavior when the shear span-to-reinforcement depth ratio is less than 2.5 (i.e., deep members). The Strut-and-tie method (STM) can be a better approach to design deep members; however, this chapter is not included in the code. Research has shown that STM models used for steel-reinforced concrete (RC) give satisfactory results when applied to glass fiber-reinforced polymer-reinforced (GFRP)-RC members with a/d less than 2.5. Therefore, this study is carried out to provide insights into the use of STM for GFRP-RC deep members based on the available literature and to highlight the necessity for the inclusion of a new chapter addressing the use of STM in the ACI 440.11 Code. It includes a design example to show the implications of ACI 440.11 code provisions when applied to GFRP-RC deep members (i.e., isolated footings) and compares it when designed as per STM provided in ACI 318-19. It was observed that current code provisions in ACI 440.11 required more concrete thickness (i.e., h = 1.12 m) leading to implementation challenges. However, the required dimensions decreased (i.e., h = 0.91 m) when the design was carried out as per STM. Due to the novelty of GFRP reinforcement, current code provisions may limit its extensive use in RC buildings, particularly in footings given the water table issues and excavation costs. Therefore, it is necessary to adopt innovative methods such as STM to design GFRP-RC deep members if allowed by the code.

Abstract Image

用于 GFRP-RC 深层构件的支撑和拉杆法
ACI 440.11 中的现行规范条款基于适用于细长构件的抗弯理论,当剪切跨度与加固深度比小于 2.5 时(即深构件),这些条款可能无法代表实际的结构行为。支柱-拉杆法(STM)可能是设计深层构件的更好方法,但该章节并未包含在规范中。研究表明,用于钢筋混凝土(RC)的 STM 模型在应用于 a/d 小于 2.5 的玻璃纤维增强聚合物增强(GFRP)-RC 构件时,结果令人满意。因此,本研究以现有文献为基础,深入探讨了 STM 在 GFRP-RC 深层构件中的应用,并强调有必要在 ACI 440.11 规范中加入一个新章节,以解决 STM 的使用问题。它包括一个设计示例,以说明 ACI 440.11 规范条款在应用于 GFRP-RC 深构件(即孤立基脚)时的影响,并将其与 ACI 318-19 中规定的 STM 设计进行比较。据观察,ACI 440.11 中的现行规范要求更厚的混凝土(即 h = 1.12 米),这给实施带来了挑战。然而,按照 STM 进行设计时,所需的尺寸却减少了(即 h = 0.91 米)。由于 GFRP 加固材料的新颖性,目前的规范规定可能会限制其在钢筋混凝土建筑中的广泛应用,特别是在基脚中,因为存在地下水位问题和开挖成本。因此,如果规范允许,有必要采用 STM 等创新方法来设计 GFRP-RC 深层构件。
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来源期刊
International Journal of Concrete Structures and Materials
International Journal of Concrete Structures and Materials CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL
CiteScore
6.30
自引率
5.90%
发文量
61
审稿时长
13 weeks
期刊介绍: The International Journal of Concrete Structures and Materials (IJCSM) provides a forum targeted for engineers and scientists around the globe to present and discuss various topics related to concrete, concrete structures and other applied materials incorporating cement cementitious binder, and polymer or fiber in conjunction with concrete. These forums give participants an opportunity to contribute their knowledge for the advancement of society. Topics include, but are not limited to, research results on Properties and performance of concrete and concrete structures Advanced and improved experimental techniques Latest modelling methods Possible improvement and enhancement of concrete properties Structural and microstructural characterization Concrete applications Fiber reinforced concrete technology Concrete waste management.
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