In order to improve the structure of the bridge,the Changhuikou large bridge was taken as the research object,and the strain time history of the bridge was collected by the method of field health monitoring,and the abnormal data was removed,interpolated and filtered by the strain signal using mathematical methods and signal processing technology.The stiffness damage of the bridge was identified and assessed by the strain ratio theory.The results show that,compared with the strain data of the upstream,downstream and most unfavorable sections of the main span of the bridge before and after processing,the bridge health monitoring data before processing have different degrees of jitter,and the data is rough.The original monitoring value,environmental noise and human excitation are mixed,and random white noise interferes with the extraction of effective signals,while the strain time history curve after processing is smooth.The random white noise is effectively filtered out,the abnormal data is removed,and the effective signal restoration is high.Based on the strain ratio analysis,it is shown that the strain ratio of the upper and lower reaches and the most unfavorable section of the bridge does not change significantly,and the structural damage does not occur.
关键词
桥梁工程/损伤识别/应变比
Key words
bridge engineering/damage identification/strain ratio
维普
万方数据