OpenQuake 0.5 Risk Non_Linear_Static_Methods

The calculation of the intensity measure level such as spectral acceleration or displacement that an exposed asset is subjected to depends on the characteristics of the asset. This set of methods combines a capacity curve (non-linear response of asset when subject to static loading) with a response spectrum to find the "performance point" of the asset. Once the performance point is found, the "fragility & consequence function based risk assessment" methods can be used to calculate damage and loss.

Notes

• Assumptions

  • Capacity curves are available for the exposed assets
  • Acceleration-displacement response spectra are produced by the hazard code
  • Fragility functions to relate with the respective engineering measure level

• Design Using a spectrum (e.g: acceleration, displacement) provided by the hazard engine, an iterative process will be employed in order to relate this curve with a capacity spectrum. A performance point will then be calculated which will provide an engineering measure level, that can be used to estimate the damage state on each asset. This damage state, can finally be related to an absolute loss through the usage of consequence functions in the form of a loss curve or map.

• User stories:

  • Expand nrml schema to support capacity spectrum for a portfolio of assets
  • Create the capacity spectrum approach module
  • Estimate the damage state based on a set of fragility functions and performance point
  • Calculate absolute losses against a damage state, using consequence functions

• Suggested Implementation

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