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Vibration Properties of 24 old Railway Bridges of Same Structure

机译：24座相同结构的旧铁路桥梁的振动特性

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In the health monitoring, it is important to solve the problem of space domain that detects anrnabnormal bridge which needs observation in consideration of varying of the monitoring indexes thatrnhomogeneous bridges have. In order to detect the certain abnormalities, it is need to comparernrelatively vibration characteristics of many bridges. This study aims at offering the fundamentalrninformation which contributes to the decision-making problem. Authors identified the vibrationrnproperties that are natural frequency and vibration modes of a 24 steel railway bridge that has beenrnused for 86 years. The 24 spans have the same structure and are used under the same loadingrncondition and almost the same environmental condition. Identified vibration characteristics (up torn70Hz for 12 modes) were compared, and it was found that there are no significant differences inrnnatural frequencies among the 24 bridges and even after 86 years of operation.
机译：在健康监测中，重要的是要解决空间桥梁中检测异常桥梁的问题，并考虑到非均质桥梁所具有的监测指标的变化。为了检测某些异常，需要比较许多桥梁的振动特性。本研究旨在提供有助于决策问题的基本信息。作者确定了振动特性，这是已使用86年的24座钢铁路桥梁的固有频率和振动模式。这24个跨度具有相同的结构，并且在相同的负载条件和几乎相同的环境条件下使用。比较了确定的振动特性（在12种模式下高达70Hz），发现在24座桥梁之间，甚至在运行86年后，固有频率也没有显着差异。

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