Theoretical Study on Natural Vibration Frequency of Externally Prestressed Simply Supported Steel Beams

Abstract Prestress is an important index of the mechanical performance prestressed structures, which will have a certain impact on natural vibration frequency structure. In this paper, based action mechanism prestressing system, externally simply supported steel beams are classified, and energy method used to establish dynamic equations with three forms cable distribution, view exploring relationship between magnitude force, distribution form, section size simply-supported beams. Through numerical example, theoretical calculation results compared finite element simulation verify formula derived in paper reveal law system beam.