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- 2005-11-3
- 仿真币
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发表于 2006-11-27 16:11:14
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来自 大连理工大学
动力阻尼的选取
对于手册上有这样一段:
What is normally attempted in a dynamic analysis is the reproduction of the frequency-independent
damping of materials at the correct level. For geological materials, damping commonly falls in the
range of 2 to 5% of critical; for structural systems, 2 to 10% is representative (Biggs 1964). In
analyses that use one of the plasticity constitutive models (e.g., Mohr-Coulomb), a considerable
amount of energy dissipation can occur during plastic flow. Thus, for many dynamic analyses that
involve large strain, only a minimal percentage of damping (e.g., 0.5%) may be required. Further,
dissipation will increase with amplitude for stress/strain cycles that involve plastic flow.
不知道各位高手如何理解,采用塑性模型(如mohr-coulomb)模型时,采用的阻尼比为0.5%???不知道其中的一句话是不是这样理解。 |
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