Abstract

Suspenders are key components of suspension bridges and are prone to corrosion, fatigue and deck fires, resulting in damage or fracture. It is necessary to study the emergency replacement technology for suspenders. In this study, a long suspender replacement device was designed for the Runyang Suspension Bridge after studying the configuration of a fire-damaged suspender anchorage structure. The proposed suspender replacement technology removed the damaged suspender with the pin shaft under zero stress instead of the traditional method with the suspender under zero stress. A finite element (FE) model was established to simulate the behavior of the suspension bridge during the suspender replacement process. The change rules for typical and key parameters, such as the temporary suspender force, replaced suspender force, and vertical displacement of the main cables and stiffening girders, are presented. Furthermore, the force monitoring data on the temporary and replaced suspender were recorded during the entire construction process without interrupting traffic. The results show that the changing trend between the FE analysis results and the measured results is consistent, and the method is safe and of little influence to the bridge.

摘要

吊索是悬索桥的关键部件，容易腐蚀、疲劳和甲板起火，导致损坏或断裂。有必要研究吊带应急更换技术。在本研究中，在研究了火灾损坏的吊杆锚固结构的构型后，为润阳悬索桥设计了一种长吊杆更换装置。所提出的吊杆更换技术用销轴在零应力下去除损坏的吊杆，而不是传统的吊杆在零应力下的方法。建立了有限元（FE）模型来模拟吊桥在吊杆更换过程中的行为。临时吊杆受力、更换吊杆受力等典型关键参数的变化规律 给出了主索和加劲梁的垂直位移和垂直位移。此外，在不中断交通的情况下，在整个施工过程中记录了临时和更换吊杆的受力监测数据。结果表明，有限元分析结果与实测结果变化趋势一致，该方法安全，对桥梁影响小。