simdesign.rcmrf.bnsm.cp01

BNSM CP01 Library

This package provides a calibrated concentrated plasticity (CP) modelling strategy within the Building Nonlinear Structural Model (BNSM), suitable for performance-based seismic assessment of existing reinforced concrete (RC) frame buildings. It contains instantiable component implementations that inherit from the abstract modelling interfaces provided by bnsm.baselib.

Model Characteristics

  • Beam: Concentrated plasticity (CP) with end hinges (Haselton et al., 2008) defined using Hysteretic moment-rotation behaviour.

  • Column: Concentrated plasticity (Haselton et al., 2008) with optional degrading shear behaviour (Elwood & Moehle, 2003) using LimitState material coupled with ThreePoint limit curves.

  • Joints: Rigid, elastic, or inelastic rotational spring models based on O’Reilly (2016).

  • Infill: Equivalent diagonal strut macro-model for masonry infills (Crowley et al., 2021).

  • Floor Diaphragm: Rigid diaphragm modelling via retained node and multi-point constraints.

  • Foundation: Lumped fixed support node.

  • Building: Aggregator class assembling all nonlinear components into a unified OpenSees domain without modification of base behaviour.

References

Haselton, C. B., Liel, A. B., Lange, S. T., & Deierlein, G. G. (2008). Beam-column element model calibrated for predicting flexural response leading to global collapse of RC frame buildings. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA.

Elwood, K. J., & Moehle, J. P. (2003). Shake table tests and analytical studies on the gravity load collapse of reinforced concrete frames. PEER Report 2003/01. Pacific Earthquake Engineering Research Center, University of California, Berkeley.

O’Reilly, G. J. (2016). Performance-based seismic assessment and retrofit of existing RC frame buildings in Italy (Doctoral dissertation, IUSS Pavia).

Crowley, H. M., Dabbeek, J., Despotaki, V., Rodrigues, D., Martins, L., Silva, V., Romão, X., Pereira, N., Weatherill, G. A., & Danciu, L. (2021). European Seismic Risk Model (ESRM20). EFEHR Technical Report 002. https://doi.org/10.7414/EUC-EFEHR-TR002-ESRM20