5. Model Calibration

The calibrate_model function transforms Single-Degree-of-Freedom (SDOF) spectral capacity parameters into Multi-Degree-of-Freedom (MDOF) storey force-deformation relationships. The first-mode shape is either an assumed power law (frame buildings up to 12 storeys) or the first eigenvector of a uniform tri-diagonal stiffness matrix (everything else), softened at the ground floor for soft-storey buildings. Only the first mode is used; no period-matching or OpenSees verification is performed.

• 5.1. SDOF-to-MDOF Calibration
  • calibrate_model()

5.2. References

1. Lu X, McKenna F, Cheng Q, Xu Z, Zeng X, Mahin SA. An open-source framework for regional earthquake loss estimation using the city-scale nonlinear time history analysis. Earthquake Spectra. 2020;36(2):806-831. doi:10.1177/8755293019891724

2. Zhen Xu, Xinzheng Lu, Kincho H. Law, A computational framework for regional seismic simulation of buildings with multiple fidelity models, Advances in Engineering Software, Volume 99, 2016, Pages 100-110, https://doi.org/10.1016/j.advengsoft.2016.05.014.

3. EN 1998-1:2004 (Eurocode 8: Design of structures for earthquake resistance - Part 1: General rules, seismic actions, and rules for buildings)