A new macro-element model encapsulating the dynamic moment-rotation behaviour of raft foundations
Institution of Civil Engineers
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Heron, C. M., Haigh, S., & Madabhushi, G. (2015). A new macro-element model encapsulating the dynamic moment-rotation behaviour of raft foundations. Géotechnique, 65 442-451. https://doi.org/10.1680/geot.SIP.15.P.020
The interaction of shallow foundations with the underlying soil during dynamic loading can have both positive and negative effects on the behaviour of the superstructure. Although the negative impacts are generally considered within design codes, seldom is design performed in such a way as to maximise the potential beneficial characteristics. This is, in part due to the complexity of modelling the soil-structure interaction. Using the data from dynamic centrifuge tests, a simple moment-rotation macro-element model has been developed which has been calibrated and validated against the experimental data. The model is capable of accurately predicting the underlying moment-rotation backbone shape and energy dissipation during cyclic loading. Utilising this model within a finite element model of the structure would allow a coupled analysis of the full soil-foundation-structure system's seismic response. This permits the beneficial soil-structure interaction characteristics, such as the dissipation of seismic energy, to be reliably included in the design process resulting in more efficient, costeffective and safe designs. In this paper the derivation of the model will be presented including details of the calibration process. In addition, an appraisal of the likely resultant error of the model prediction will be presented and visual examples of how well the model mimics the experimental data will be provided.
The authors would like acknowledge the collaborative and financial support received through the European Community’s Seventh Framework programme (FP7/2007-2013) under grant agreement number 227887 (SERIES – Seismic Engineering Research Infrastructures for European Synergies).
EC FP7 CP WITH CSA (227887)
External DOI: https://doi.org/10.1680/geot.SIP.15.P.020
This record's URL: https://www.repository.cam.ac.uk/handle/1810/247624