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首页> 外文期刊>Journal of structural engineering >Development of Mechanical Strengthening System for Bridge Connections Using Prestressed CFRP Rods
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Development of Mechanical Strengthening System for Bridge Connections Using Prestressed CFRP Rods

机译：采用预应力CFRP棒的桥接连接机械强化系统的研制

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Stringer-to-floor beam web-to-web double-angle connections are among the most fatigue-prone elements in old riveted bridges. These connections are often designed to carry only shear loads. However, in these elements, fatigue damage occurs because of the out-of-plane deformation of the connections, which is ignored in the original design. In this study, a new retrofitting system is developed to reduce the out-of-plane deformation of the connections using prestressed carbon fiber-reinforced polymer (CFRP) rods. The proposed system consists of a mechanical wedge-barrel anchor to hold the prestressed CFRP rod and a clamping system to attach to the parent structure and to transmit forces via friction. A series of finite-element (FE) simulations was conducted to optimize the size and performance of the retrofit system. Laboratory static pull-off tests were conducted and different failure modes were studied and discussed. A novel test setup (with four supports) was designed for testing the steel connections. The effect of the geometrical imperfections during the installation of the connection was carefully investigated using the FE models and was verified through laboratory the tests. Laboratory fatigue tests were conducted on steel connections with the same dimensions as those in a railway bridge. The designed retrofit system was found to be capable of reducing the stresses at the angle connections by more than 40%. The results of the fatigue tests demonstrated that the designed system could survive more than 11 million load cycles without any fatigue damage or any indication of a loss in the CFRP prestressing level. (C) 2020 American Society of Civil Engineers.
机译：纵梁到地板梁网对幅材双角度连接是旧铆接桥梁中最疲劳的易于易发器的元素。这些连接通常设计用于仅携带剪切载荷。然而，在这些元素中，由于连接的平面异地变形，发生疲劳损坏，这在原始设计中被忽略。在这项研究中，开发了一种新的改造系统，以使用预应力碳纤维增强聚合物（CFRP）棒来减少连接的外平面变形。所提出的系统包括机械楔形筒锚，以保持预应力的CFRP棒和夹紧系统，以连接到母体结构并通过摩擦传递力。进行了一系列有限元（FE）模拟以优化改造系统的尺寸和性能。进行了实验室静电掉落试验，并研究并讨论了不同的失效模式。设计了一种新型测试设置（具有四个支撑件），用于测试钢连接。使用FE模型仔细研究了几何缺陷在安装连接期间的效果，并通过实验室验证了测试。实验室疲劳试验是在与铁路桥中相同尺寸的钢连接上进行的。发现设计的改造系统能够将角度连接的应力降低超过40％。疲劳试验的结果表明，设计的系统可以在没有任何疲劳损坏的情况下存活超过1100万次负载循环，或者在CFRP预应力水平中的任何损失指示。 （c）2020年美国土木工程师协会。

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