Abstract
Arch dams are designed as relatively thin structures compared to gravity concrete dams. Due to this fact these structures are to a higher extent susceptible to earthquake excitation. Possible local damage they could suffer e.g. by means of cracks, lead to nonlinear effects and to a redistribution of forces in the structure. They have substantial extra capacities to be overloaded until a more severe damage occurs. Especially in seismic active areas high dams need to be investigated carefully. The stresses in the structure could be increased by more
than 100 percent due to a seismic event compared with normal static loading conditions. Investigations of the dynamic behaviour with numerical simulations are very helpful, though it is not easy to account for the inherent nonlinearities. A part of the nonlinear behaviour in dynamic simulations is modelled with damping to account for the energy dissipation. Damping factors or Damping-Matrices are not a material parameter, which could be
tested in a laboratory. However, with different in situ methods it is possible to account for the hysteretic damping.
Viscous damping could be applied in numerical simulations by using so called Rayleigh-Damping. For concrete structures or especially dams the damping factor is accounted for with approx. 5 percent of the critical damping.
Investigations of existing dam structures in the past showed that this factor could vary between 1 to 7 percent (or be even much higher), which leads to an increase or decrease of the stress level due to shaking. Within this contribution the influence on stresses in the dam structure is investigated by applying different damping factors and being accelerated with a transient earthquake record. The arch dam, which is an idealized model itself, has a total height of 220 meters. The interaction with the water is accounted for by using added
mass technique and for comparison reasons with a fully modelled reservoir too. The reservoir is discretized with so called “Acoustic Elements”. This work shows the impact of varying damping factors and different interaction modelling for the dam and a reservoir on the stress level in the dam
than 100 percent due to a seismic event compared with normal static loading conditions. Investigations of the dynamic behaviour with numerical simulations are very helpful, though it is not easy to account for the inherent nonlinearities. A part of the nonlinear behaviour in dynamic simulations is modelled with damping to account for the energy dissipation. Damping factors or Damping-Matrices are not a material parameter, which could be
tested in a laboratory. However, with different in situ methods it is possible to account for the hysteretic damping.
Viscous damping could be applied in numerical simulations by using so called Rayleigh-Damping. For concrete structures or especially dams the damping factor is accounted for with approx. 5 percent of the critical damping.
Investigations of existing dam structures in the past showed that this factor could vary between 1 to 7 percent (or be even much higher), which leads to an increase or decrease of the stress level due to shaking. Within this contribution the influence on stresses in the dam structure is investigated by applying different damping factors and being accelerated with a transient earthquake record. The arch dam, which is an idealized model itself, has a total height of 220 meters. The interaction with the water is accounted for by using added
mass technique and for comparison reasons with a fully modelled reservoir too. The reservoir is discretized with so called “Acoustic Elements”. This work shows the impact of varying damping factors and different interaction modelling for the dam and a reservoir on the stress level in the dam
| Original language | English |
|---|---|
| Title of host publication | Vienna Congress on Recent Advances in Earthquake Engineering and Structural Dynamics |
| Number of pages | 10 |
| Publication status | Accepted/In press - 2013 |
| Event | 2013 Vienna Congress on Recent Advances in Earthquake Engineering and Structural Dynamics : VEESD 2013 - Wien, Austria Duration: 28 Aug 2013 → 30 Aug 2013 |
Conference
| Conference | 2013 Vienna Congress on Recent Advances in Earthquake Engineering and Structural Dynamics |
|---|---|
| Abbreviated title | VEESD 2013 |
| Country/Territory | Austria |
| City | Wien |
| Period | 28/08/13 → 30/08/13 |
Fields of Expertise
- Sonstiges
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