Evaluation of the Vibrational Properties of Three-Span Continuous Concrete Bridge by Dynamic Finite

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Evaluation of the Vibrational Properties of Three-Span Continuous Concrete Bridge by Dynamic Finite Element Method.

Pouraminian M., Amarlou M., Pourbakhshian S., Khodayari R.

J. Civil Eng. Urban., 5(1): 27-30, 2015; pii:S225204301500006-5

Abstract

This study follows two objectives: first, determining the effect of defining master dynamic degrees of freedom on vibrational properties and increase structure analysis running speed, and second, estimation of response accuracy and vibrational properties of simplified dynamic finite element model of the bridge by one-dimensional elements and lump masses. After designing simplified model of bridge with nine lump masses, the estimation error rate in dominated period of the structure is examined in both accurate model and lump mass. The mass and stiffness matrices derived from analysis of ANSYS software are also shown. The responses of accurate and simplified models are studied, and it was observed that the simplified finite element model has reasonable estimation of vibrational properties of the bridge.
Keywords: Concrete Bridge, Dynamic Finite Elements, Mass Matrix, Stiffness Matrix, Master Dynamic Degree of Freedom, ANSYS

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