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| Vibration characteristics of composite I-beam with corrugated steel webs |
| ZHANG Zichen1, WANG Genhui1, FAN Jiang2 |
1.School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070,China;
2.Gansu Province Transportation Planning, Survey & Design Institute Co.,Ltd.,Lanzhou 730070, China |
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Abstract In order to analyze the bending vibration frequency and dynamic response characteristics of composite I-beam with corrugated steel webs, considering the influence of multi-factors such as shear deformation, moment of inertia, self balance of shear lag warping stress and accordion effect, two different longitudinal warping dynamic displacement difference functions were set up for the upper and lower flange plates of composite I-beam. The natural frequencies of composite I-beam under different boundary conditions were calculated by numerical examples. The effects of shear lag effect and warping stress self balance on the vibration characteristics of composite I-beam were analyzed in detail. It shows that the calculated results of the calculated results of the proposed closed-form solutions agree well with the ANSYS finite element values, and the calculation accuracy is significantly improved; the shear lag effect reduces the vertical stiffness of the composite I-beam, and its influence increases with the increase of frequency order, and decreases with the increase of span width ratio; Compared with the simply supported composite girder, the frequency value of the composite girderone with fixed ends is more affected by the shear lag effect; The results show that the contribution of stress self balance to the natural frequency of composite I-beam is less than 5%, and the influence on the dynamic stress amplitude of wing plate is more than 10%. The plane section assumption is no longer applicable in the dynamic analysis of this kind of structure.
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Received: 01 February 2021
Published: 28 April 2022
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