Steel and Composite Structures

  • 제44권4호
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  • Pages.531-543
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  • 2022
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  • 1229-9367(pISSN)
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  • 1598-6233(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Exact and approximate solutions for free vibrations of continuous partial-interaction composite beams

  • Sun, Kai Q. (School of Civil Engineering, Beijing Jiaotong University) ;
  • Zhang, Nan (School of Civil Engineering, Beijing Jiaotong University) ;
  • Zhu, Qun X. (School of Civil and Environmental Engineering, University of Technology Sydney (UTS)) ;
  • Liu, Xiao (School of Civil Engineering, Beijing Jiaotong University)
  • 투고 : 2021.05.19
  • 심사 : 2022.08.10
  • 발행 : 2022.08.25
⟨ 이전 논문 다음 논문 ⟩

초록

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.

키워드

과제정보

The research described in this paper was financially supported by the National Natural Science Foundation of China (52178101). In addition, the authors would like to express their gratitude to EditSprings (https://www.editsprings.com/) for the expert linguistic services provided.

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