Effect of the failure mode on the macro-response of pile groups
Effect of the failure mode on the macro-response of pile groups
This paper contributes to the generalisation of existing models that describe the multiaxial response of pile groups. Most of these models, including a specific model proposed by the Authors, assume that the foundation piles are rigidly connected to the raft. In this study, the multiaxial conditions of deep foundations are analysed by assuming a frictional disconnection at the pile-raft level, aimed at limiting the shear forces transferred to the superstructure under seismic loading. This objective is accomplished through numerical-aided limit analysis and using advanced finite-element analysis. The modifications on the failure loads obtained for the dissipative configuration are incorporated into a hyperplastic macroelement of the piled founda-tion system to provide a calculation tool capable to account for a disconnection at the piles-raft interface. The macroelement is implemented in OpenSees and the effectiveness of the frictional disconnection is tested on a case study of a multi-span girder bridge in which both the piers foundations and the abutments are provided with this base isolation device.
Davide Noe Gorini; Luigi A. Callisto
10th European Conference on Numerical Methods in Geotechnical Engineering (NUMGE2023)
9. Shallow and deep foundations
https://doi.org/10.53243/NUMGE2023-220
Contact Information
- Secretary General - Dr A M McNamara
- Email: [email protected]
- Phone: +44 20 7040 8154
- City, University of London
- Northampton Square
- London EC1V 0HB. United Kingdom