Research on On-line Testing Mechanism of Strain Monitoring Sensor during Bridge Structure Load Test

Bridge health monitoring is one of the important guarantees for ensuring the long-life and safe operation of bridge structures. The rapid dynamic acquisition of various high-precision high-frequency sensors is used to achieve accurate sensing of the operational status of the bridge structure, and the collected data sets include structural responses. The analysis of structural system characteristics achieves three aspects of structural monitoring and evaluation, design verification and research and development. During the use process, due to many uncertain factors such as long working hours and harsh working environment, some of the measurement parameters of the field sensing components and data mining equipment may change, but the sensors are faced with the use time during use. Longer problems that require calibration. In this paper, the traceable vehicle load input is used to achieve the online test comparison of the corresponding variable sensor. The repetitive and static load repeated test is combined with the numerical simulation method to confirm the correlation between the load input and the structural response. The influence of the constitutive performance parameters such as stiffness and strength of the bridge structure on the test structure is reduced. Combined with the professional methods of metrology, the repetitive evaluation of bridge strain monitoring data under different working conditions is fully demonstrated, and the possibility of on-line calibration of strain monitoring sensors during load test is fully demonstrated.