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Modelling damping for seismic safety evaluation of arch dams

机译：拱坝地震安全性评估的模型阻尼

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This paper looks at the required damping for three-dimensional finite-element models used In earthquake analysis of arch dams. Values of 8 to 15 per cent are obtained by comparing recorded and computed seismic responses at three large dams. Possible sources of energy dissipation explaining these high values are discussed. For the past ten years, the Swiss Federal Office for Water and Geology (FOWG) has been involved in long-term research projects on the dynamic behaviour of dams. This involved instrumenting several large dams with strong-motion instruments [Darbre, 1995] and performing a series of ambient [Darbre, De Smet and Kraemer, 2002; Darbre and Proulx, 2001] and force-vibration [Proulx, Paultre, Rheault and Robert, 2001] tests. These investigations were carried out with the objective of providing a better understanding of the earthquake behaviour of dams and of the relevant modelling requirements. In this respect, one key aspect is the amount of damping that needs to be introduced in the model in the course of seismic safety evaluations. This paper addresses this issue by comparing recorded and computed earthquake motions at three arch dams.
机译：本文探讨了拱坝地震分析中使用的三维有限元模型所需的阻尼。通过比较三个大型水坝的记录地震响应和计算地震响应，可得出8％至15％的值。讨论了解释这些高值的可能的能量耗散来源。在过去的十年中，瑞士联邦水和地质办公室（FOWG）参与了有关大坝动力特性的长期研究项目。这包括用强力仪器对几个大型水坝进行仪器检测（Darbre，1995），并进行一系列的环境监测（Darbre，De Smet和Kraemer，2002年）。 Darbre和Proulx，2001]和力振动[Proulx，Paultre，Rheault和Robert，2001]测试。进行这些调查的目的是为了更好地理解大坝的地震行为以及相关的建模要求。在这方面，一个关键方面是在地震安全性评估过程中需要在模型中引入的阻尼量。本文通过比较三个拱坝上记录和计算的地震运动来解决这个问题。

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