Strengthening of slender webs of steel plate girders using FRP composites

IF 1.2 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Proceedings of the Institution of Civil Engineers-Structures and Buildings Pub Date : 2024-03-01 DOI:10.1680/jstbu.22.00174

Muhammad Aslam Bhutto, Muhammad Masood Rafi

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Abstract

Web buckling of steel plate girders creates an undesirable failure mode as it can limit the ultimate load capacity of plate girders. This paper presents details of an experimental investigation aimed at strengthening slender end panels of steel plate girders using three different types of fibre-reinforced polymer (FRP) composite materials (glass-fibre-reinforced polymer (GFRP) pultruded section stiffeners and woven carbon-fibre-reinforced polymer (CFRP) and GFRP fabrics). The plate girders were fabricated using non-rigid end posts and were tested in three-point bending. The test results showed an increase of up to 54% in the ultimate strength of the FRP-strengthened end panels compared with the non-strengthened control panel, which was the result of increased out-of-plane stiffness of the web. A breakdown of the bond between the steel and the FRP fabric occurred in the end panels strengthened with CFRP and GFRP fabrics, while no bond breakdown of the pultruded sections was observed at the ultimate load. Analytical methods proposed by some of the design codes underestimated the critical buckling load and overestimated the ultimate load of the non-strengthened end panel.

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使用 FRP 复合材料加固钢板梁的细长腹板

钢板梁的腹板屈曲是一种不理想的失效模式，因为它会限制钢板梁的极限承载能力。本文详细介绍了一项实验研究，旨在使用三种不同类型的纤维增强聚合物 (FRP) 复合材料（玻璃纤维增强聚合物 (GFRP) 拉挤型材加劲件以及碳纤维增强聚合物 (CFRP) 和 GFRP 编织物）加固钢板梁的细长端板。板梁采用非刚性端柱制造，并进行了三点弯曲测试。测试结果表明，与未加固的控制板相比，玻璃纤维增强端板的极限强度提高了 54%，这是腹板平面外刚度增加的结果。在使用 CFRP 和 GFRP 织物加固的端板中，钢材和 FRP 织物之间的粘结发生了破坏，而拉挤型材在达到极限载荷时没有发生粘结破坏。一些设计规范提出的分析方法低估了临界屈曲载荷，高估了未加固端面板的极限载荷。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Proceedings of the Institution of Civil Engineers-Structures and Buildings 工程技术-工程：土木

CiteScore

3.40

自引率

6.20%

发文量

审稿时长

12 months

期刊介绍： Structures and Buildings publishes peer-reviewed papers on the design and construction of civil engineering structures and the applied research associated with such activities. Topics include the design, strength, durability and behaviour of structural components and systems. Topics covered: energy conservation, people movement within and around buildings, strength and durability of steel and concrete structural components, and the behaviour of building and bridge components and systems