VIBRATION SIMULATION OF BOLTED JOINTS COMPOSED OF STEEL AND CONCRETE BY FINITE ELEMENT METHOD CONSIDERING INTERFACIAL STIFFNESS

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  • 接合部界面の剛性を考慮した有限要素法による鋼材とコンクリートからなるボルト締結体の振動シミュレーション

Abstract

<p>This study has developed a novel technique for vibration simulation by using interfacial element that simulates contact of micro asperities formed on interfaces of bolted joints. The stiffness of the interfacial element is derived by the assumption in which peak heights of the asperities obey the Gaussian distribution and the contact of the asperities is the Hertzian contact. Due to this assumption, the stiffness of the interfacial element is determined by compressive stress and surface texture of the interfaces. Finite element simulations with the interfacial element and hammering tests were performed by using a miniature specimen of bolted joints composed of steel and concrete. The results of the finite element simulations and the hammering tests have shown the validity of the proposed technique. Moreover, the methodology to estimate the clamping force of the bolted joints from the natural vibration has been discussed. The hammering tests and the finite element simulations were also conducted under the condition in which the clamping force of the screw bolts was varied. The results have shown that loosen bolts can be detected by the difference of the power spectra obtained with accelerometers.</p>

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