The first engineering application of 10MN CFRP cables in cable-stayed bridge in China

IF 3.9 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2024-09-03 DOI:10.1016/j.istruc.2024.107199

Ligang Qi, Jie Bai, Hangzi Wu, Guowen Xu, Hao Xiong, Yan Yang

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引用次数: 0

Abstract

Existing engineering applications typically involve carbon fiber reinforced polymers (CFRP) cables with relatively small ultimate tensile forces (less than 10MN). This study presents the engineering application of China's first thousand-ton-grade CFRP cable-stayed bridge. The optimal steel and CFRP hybrid cable system was determined through a comparative analysis of structural behavior and life cycle cost. Thereafter, the CFRP cable, consisting of 121 strands of φ7 CFRP tendons, along with its anchoring system, was designed and manufactured with a theoretical ultimate tensile strength of 10,710 kN (). Subsequently, the mechanical properties of 7–121 CFRP cable were investigated and experimentally verified. The tensile test revealed a satisfied ultimate tensile bearing capacity of 10,805 kN. Furthermore, after two million fatigue cycles, the CFRP cables retained approximately 90 % of their theoretical ultimate force, highlighting their excellent fatigue resistance. Besides, no damage occurred with a maintained tension force of 0.45 at a temperature of 150 °C for a duration of at least 30 min, meeting the requirements of specification. Moreover, the key procedures of CFRP cable installation were also claimed. This study aims to further promote the application and development of CFRP cables in larger span and even super-long span bridges.

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10MN CFRP 索在中国斜拉桥上的首次工程应用

现有的工程应用通常涉及极限拉力相对较小（小于 10MN）的碳纤维增强聚合物（CFRP）缆索。本研究介绍了中国首座千吨级 CFRP 斜拉桥的工程应用。通过对结构行为和生命周期成本的比较分析，确定了最佳的钢索和 CFRP 混合索系统。随后，设计并制造了由 121 股 φ7 CFRP 筋组成的 CFRP 斜拉索及其锚固系统，其理论极限抗拉强度为 10,710 kN（）。随后，对 7-121 CFRP 拉索的机械性能进行了研究和实验验证。拉伸试验显示，极限拉伸承载力为 10805 千牛。此外，在经过两百万次疲劳循环后，CFRP 缆线仍保持了约 90% 的理论极限力，凸显了其卓越的抗疲劳性能。此外，在温度为 150 ℃、持续时间至少为 30 分钟的情况下，保持 0.45 的拉力也未出现损坏，符合规范要求。此外，还对 CFRP 电缆安装的关键程序进行了说明。本研究旨在进一步促进 CFRP 索在更大跨度甚至超大跨度桥梁中的应用和发展。

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

Structures Engineering-Architecture

CiteScore

5.70

自引率

17.10%

发文量

1187

期刊介绍： Structures aims to publish internationally-leading research across the full breadth of structural engineering. Papers for Structures are particularly welcome in which high-quality research will benefit from wide readership of academics and practitioners such that not only high citation rates but also tangible industrial-related pathways to impact are achieved.

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