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Steel and Composite Structures Volume 44, Number 4, August25 2022 , pages 531-543 DOI: https://doi.org/10.12989/scs.2022.44.4.531 |
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Exact and approximate solutions for free vibrations of continuous partialinteraction composite beams |
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Kai Q. Sun, Nan Zhang, Qun X. Zhu and Xiao Liu
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| Abstract | ||
| An exact dynamic analytical method for free vibrations of continuous partial-interaction composite beams is proposed based on the Timoshenko beam theory. The main advantage of this method is that the independent shear deformations and rotary inertia of sub-beams are considered, which is more in line with the reality. Therefore, the accuracy of eigenfrequencies obtained by this method is significantly improved, especially for higher order modes, compared to the existing methods where the rotary angles of both sub-beams are assumed to be equal irrespective of the differences in the shear stiffness of each sub-beam. Furthermore, the solutions obtained by the proposed method are exact owing to no introduction of approximated displacement and force fields in the derivation. In addition, an exact analytical solution for the case of simply supported is obtained. Based on this, an approximate expression for the fundamental frequency of continuous partial-interaction composite beams is also proposed, which is useful for practical engineering applications. Finally, the practicability and effectiveness of the proposed method and the approximate expression are explored using numerical and experimental examples; The influence factors including the interfacial interaction, shear modulus ratio, span-to-depth ratio, and side-to-main span length ratio on the eigenfrequencies are presented and discussed in detail. | ||
| Key Words | ||
| approximate expression; continuous partial-interaction composite beam; exact dynamic analytical method; free vibrations; influence factors | ||
| Address | ||
| Kai Q. Sun:School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China Nan Zhang:School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China Qun X. Zhu:School of Civil and Environmental Engineering, University of Technology Sydney (UTS), Sydney NSW 2007, Australia Xiao Liu:School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China | ||