Techno Press

Steel and Composite Structures   Volume 24, Number 1, May20 2017, pages 79-91
Free vibration of a steel-concrete composite beam with coupled longitudinal and bending motions
Jun Li, Li Jiang and Xiaobin Li

Abstract     [Full Text]
    Free vibrations of steel-concrete composite beams are analyzed by using the dynamic stiffness approach. The coupled equations of motion of the composite beams are derived with help of the Hamilton's principle. The effects of the shear deformation and rotary inertia of the two beams as well as the transverse and axial deformations of the stud connectors are included in the formulation. The dynamic stiffness matrix is developed on the basis of the exact general solutions of the homogeneous governing differential equations of the composite beams. The use of the dynamic stiffness method to determine the natural frequencies and mode shapes of a particular steel-concrete composite beam with various boundary conditions is demonstrated. The accuracy and effectiveness of the present model and formulation are validated by comparison of the present results with the available solutions in literature.
Key Words
    steel-concrete composite beams; shear deformation; rotary inertia; free vibration; dynamic stiffness approach
Departments of Naval Architecture, Ocean and Structural Engineering, School of Transportation, Wuhan University of Technology, Wuhan, China.

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