Abstract

The specially orthotropic plate theory is used for analysis of panels made of girders and cross-beams. The cross-sections of both girders and cross-beams ar H-type. A method of calculating natural frequencies corresponding to the modes of vibration of beams and tower structures with irregular cross sections and arbitrary boundary conditions was developed. The results of application of this method to steel bridge by using specially orthotropic plate theory is presented. The result is compared with that of the beam theory. Finite difference method is used for this purpose. The influence of the $D_{22}$ stiffiness on the natural frequency is rigorously investigated. According to numerical examination given in this paper the result by the plate theory is 2.43 times stiffer than of beam theory.

Keywords

• vibration analysis;
• specially orthotropic plate theory;
• beam theory;
• finite difference method;
• stiffness;
• deflection;
• natural frequency

• 진동해석;
• 특별직교이방성 판이론;
• 빔이론;
• 유한차분법;
• 강성;
• 처짐;
• 고유진동수;

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Acknowledgement

Supported by : Seoul National Univeristy

References

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