The abnormal vibration for reinforced concrete trestles is a typical abnormal phenomenon during the operation of such projects.In order to find out the cause of the abnormal vibration and evaluate the safety of the structure,the internal and external causes that may lead to the abnormal vibration are investigated based on the combination of on-site detection and investigation,dynamic measurement and numerical simulation.Finally,the factors with high possibility are discriminated and screened,and the causes of abnormal vibration are analyzed.The research results show that the abnormal vibration of the trestle is caused by the"beat phenomenon"caused by the resonance of the second-order natural frequency and the excitation frequency of the horizontal bearing sys-tem,the small difference in the rotation speed of the idler.Among them,the pulling vibration generated by the idler on the trestle is the main factor that causes its abnormal vibration.This study provides reference value for the cause analysis of abnormal vibration of similar waterway engineering structures.
维普
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