Research on flow 2induced vibration characteristics of layered concrete structure

Vibration of hydraulic structures caused by flood discharge excitation occurs frequently and has different forms, and serious vibration may lead to structural damage. Few cases of damage caused by vibration for layered concrete structures were presented, and the study of vibration response mechanism was not enough. In this paper, the vibration responses of concrete arch dam with two different structures, including a whole structure and a layered structure, under the same flow discharge conditions were investigated through the comparative analysis of numerical calculation and model test. The relationship between the struc 2 ture and vibration response was analyzed. Furthermore, the relationship between the vibration response of layered concrete structure and flow discharge was studied in consideration of the "beat" concept. The results showed that the beat vibration is mainly caused by the first two bands of vibration with similar frequency. Although the conditions for the formation of beat vi 2 bration may not exist, the vibration curve can present the form of "beat", and the vibration quantity is much large than that of the forced vibration, which indicated that this is actually the hydraulic resonance phenomenon.

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