doi:

DOI: 10.3724/SP.J.1249.2018.04383

Journal of Shenzhen University Science and Engineering (深圳大学学报理工版) 2018/35:4 PP.383-388

Influence of external strand on vibration frequency of simply supported box girder with corrugated steel webs


Abstract:
In order to determine the effect of external strand on the natural vibration frequency of a simply supported composite box girder with corrugated steel webs, we derive the analytical formula of the vibration frequency based on the differential equation of flexural vibration for a simply supported beam under external strand. Considering the effect of prestressed tension and revision of the elastic modulus under the state of concrete complex stress, we use the numerical method to analyze the natural frequency of the test beam. The results indicate that prestressed tension has a stress softening effect, causing the decrease of the stiffness of the structure. Thus the vibration frequency is reduced. For the test beam, the prestressed tension has little influence on the stiffness. However, the external beam prestressed tension causes the concrete to be in complex stress state, and the elasticity modulus in complex stress state is different from that in uniaxial stress state. The external strand will increase the natural frequency.

Key words:bridge engineering,external strand,composite box girder with corrugated steel webs,simply supported beam,vibration frequency,stiffness

ReleaseDate:2018-07-26 10:51:03



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