Abstract
Ground failure during major seismic events associated with soil liquefaction can lead to major structural damage in both the columns and bridge upper deck, due to large seismic-induced displacements in the support foundation. Liquefaction driven ground motion incoherence during the dynamic event, and permanent soil deformations are key variables in the observed damage. This paper summarizes a numerical study of an alternative bridge foundation design proposed to reduce support displacements during and after an earthquake, as well as relative settlement associated with partial loss of bearing capacity when the bridge column is founded on a potential liquefiable layer. Three dimensional numerical models were developed with the program FLAC3D. The seismic environment was characterized by a uniform hazard spectrum, UHS, developed for a nearby rock outcrop, considering a return period of 1000 years. Initially, a one-dimensional analysis was performed with the software SHAKE, to evaluate the liquefaction susceptibility. Later, to consider changes in both topography and ground subsurface layering of the site, a two-dimensional model was developed with the program QUAD4M. Based on the results gathered in here, it was concluded that structured cell foundation is a sound alternative to improve the seismic performance of bridges located in liquefiable soils and allows reducing detrimental effects associated with liquefaction-induced ground deformations.
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Mayoral, J.M., De La Rosa, D., Alcaraz, M., Olivera, N., Anaya, M. (2022). Foundation Alternatives for Bridges in Liquefiable Soils. 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_94
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