Rocking Earthquake Response Analysis of Traveling Crane Using Natural Vibration Modes.

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  • 固有モードを用いた走行式クレーンのロッキング地震応答解析
  • コユウ モード オ モチイタ ソウコウシキ クレーン ノ ロッキング ジシン オウトウ カイセキ

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Abstract

This paper describes a rocking earthquake response analysis method of traveling cranes, which alternates the natural vibration modes in the state of legs lifted and that of all legs contacted with rails. For wheels landing on rails, the method assumes the inelastic collision that satisfies conservation of momentum related to the natural vibration modes in the state of all legs contacted with rails. By this approach, degrees of freedom for analysis become small and we can easily examine the rocking behavior in a design stage by parameter changes. Shake table experiments were carried out with a crane model that has natural frequencies of about 10 times that of actual cranes. The calculations of free rocking response, sine wave response and earthquake wave response for the carne model using the first and second order natural vibration modes were shown to be in good accordance with the experiments.

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