Abstract
This paper investigates an example problem of bridge retrofit due to widening, focusing on the foundation. Conventional foundation retrofit is compared to an unconventional “do-nothing” approach, where the existing pile group is maintained, allowed to fully develop its moment capacity. The two systems are comparatively assessed employing the finite element (FE) method, accounting for all sources of material and geometric nonlinearities. The soil is modelled with the hypoplastic model for sand, while the Concrete Damaged Plasticity (CDP) model is used for all reinforced concrete (RC) members (piles and bridge pier). The soil-pile interface is modelled with frictional interface elements. Both foundation systems (retrofitted and existing) are initially subjected to pushover loading to comparatively assess their moment capacities. Subsequently, the widened bridge with and without foundation retrofit is subjected to dynamic time history analysis using excitations representative of Swiss seismicity. The performance of the two approaches is comparatively assessed, considering structural and geotechnical performance criteria. The paper provides useful insights regarding the benefits and limitations of unconventional retrofit design of piled foundations.
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Acknowledgements
The authors would like to acknowledge the contribution of Manuela Fehr in the evaluation of the results of the FE analyses presented in this study.
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Sakellariadis, L., Alber, S., Anastasopoulos, I. (2022). Unconventional Retrofit Design of Bridge Pile Groups: Benefits and Limitations. In: Wang, L., Zhang, JM., Wang, R. (eds) Proceedings of the 4th International Conference on Performance Based Design in Earthquake Geotechnical Engineering (Bei**g 2022). PBD-IV 2022. Geotechnical, Geological and Earthquake Engineering, vol 52. Springer, Cham. https://doi.org/10.1007/978-3-031-11898-2_102
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