Study on the Technical Condition Evaluation Method Based on the Measured Results of the Natural Frequency of the Bridge Superstructure
With the increase of service period,the function of bridge is gradually degraded.It is very important to evaluate its technical condition reasonably for maintenance decision.Especially for some bridges after reinforcement and disposal,the original structure does not have the conventional detection conditions,and it is difficult to accurately grasp the actual working state of the bridge.The natural frequency is an inherent characteristic of the bridge.When the bridge function declines,its structural stiffness decreases,and the measured natural frequency also decreases accordingly,which directly reflects the working state of the bridge.Therefore,looking for the relationship between the measured results of the natural vibration frequency of the bridge and its technical status level can not only quickly grasp the working state of the bridge,but also reflect some hidden diseases that cannot be detected by conventional means through the natural vibration frequency.The technical condition evaluation method based on the measured results of the natural frequency can provide a reliable decision-making basis for the bridge maintenance management department to carry out bridge management and maintenance.
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万方数据
