Dynamic analysis of a new-pattern composite box girder with corrugated steel webs under time-varying temperature condition

WANG Li1,LIU Shizhong1,DING Wanpeng1,LU Wei1,2,NIU Sisheng3,FENG Lun2

Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (4) : 58-65.

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (4) : 58-65.

Dynamic analysis of a new-pattern composite box girder with corrugated steel webs under time-varying temperature condition

  • WANG Li1,LIU Shizhong1,DING Wanpeng1,LU Wei1,2,NIU Sisheng3,FENG Lun2
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Abstract

Under the influence of sunshine radiation and variable temperature environment, the structural temperature of a new type of composite box girder with corrugated steel web (CSW) presents uneven distribution, which causes the change of static and dynamic characteristics of the structure.In this work, a new analytical method for the calculation of the natural frequency of a composite box girder with CSW was proposed based on the stress equivalence principle, which considers the slip effect of steel-concrete interface under the action of time-varying temperature.Taking the new type of simple supported CSW composite box girder with a span of 8.0 m as the research object, the finite element simulation analysis and analytical calculation were carried out for the test beam, and the comparison was made with the field measured value.The results show that: time-varying temperature will cause significant change in the frequency of the new-pattern CSW composite box girder; the change of the elastic modulus of concrete is the key factor of the dynamic characteristic of CSW composite box girder; the temperature causes the relative change of the 3rd-order modal frequency of the new-pattern CSW composite box girder up to 5.2%-7.3%, and the influence of temperature effect should be considered in the dynamic characteristic test and structural performance evaluation of this type of bridge.

Key words

corrugated steel web(CSW) / composite box girder / time-varying temperature effect / natural frequency / dynamic characteristics

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WANG Li1,LIU Shizhong1,DING Wanpeng1,LU Wei1,2,NIU Sisheng3,FENG Lun2. Dynamic analysis of a new-pattern composite box girder with corrugated steel webs under time-varying temperature condition[J]. Journal of Vibration and Shock, 2021, 40(4): 58-65

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