In suspension bridges, hanger cables are the main load‐supporting members. The tension of the hanger cables of a suspension bridge is a very important parameter for assessing the integrity and safety of the bridge. In general, indirect methods are used to measure the tension of the hanger cables of a suspension bridge in use. A representative indirect method is the vibration method, which extracts modal frequencies from the cables' responses and then measures the cable tension using the cables' geometric conditions and the modal frequencies. In this study, ambient vibration tests were conducted on a suspension bridge in use to verify the validity of the image‐based back analysis method, which can estimate the tension of remote hanger cables using the modal frequencies as a parameter. The tension estimated through back analysis, which was conducted to minimize the difference between the modal frequencies calculated using finite element analysis of the hanger cables and the measured modal frequencies, was compared with that measured using the vibration method. It was confirmed that reliable tension estimation is possible even with low‐order modal frequencies when the image‐based back analysis method is used.

中文翻译：

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基于图像的反分析用于悬索桥吊索的张力估算

在吊桥中，吊索是主要的载荷支撑构件。悬索桥吊索的张力是评估桥梁完整性和安全性的一个非常重要的参数。通常，使用间接方法来测量所使用的悬索桥的吊索的张力。代表性的间接方法是振动法，该方法从电缆的响应中提取模态频率，然后使用电缆的几何条件和模态频率来测量电缆张力。在这项研究中，在使用中的悬索桥上进行了环境振动测试，以验证基于图像的反分析方法的有效性，该方法可以使用模态频率作为参数来估计远程吊架电缆的张力。通过反向分析估算的张力 为了使使用悬架电缆的有限元分析计算出的模态频率与测得的模态频率之间的差异最小化，将其与使用振动法测得的模态频率进行了比较。已经证实，当使用基于图像的反分析方法时，即使在低阶模态频率下，也可以进行可靠的张力估计。