Liquefaction induced displacement and rotation of structures with wide basements
Soil Dynamics and Earthquake Engineering
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Hughes, F., & Madabhushi, G. (2019). Liquefaction induced displacement and rotation of structures with wide basements. Soil Dynamics and Earthquake Engineering, 120 75-84. https://doi.org/10.1016/j.soildyn.2019.01.006
Earthquake induced liquefaction can cause structures with shallow foundations to experience large settlement and rotation, and can cause subsurface structures to uplift. The performance of structures with basements, which intuitively combine these two problems, is not understood. In this paper, data from three dynamic centrifuge tests on structures with wide basements are examined. The ratio of upward to downward vertical forces was varied, and a symmetric and asymmetric superstructure was tested. Digital image correlation was used to capture the soil displacements, providing novel insight into the co-seismic soil-structure interaction. The inclusion of wide basements was shown to reduce the overall settlement of structures by providing an increased uplift force during the liquefi ed period. For symmetric structures, symmetric soil displacements occurred around the basement during consecutive half-cycles of sinusoidal shaking, resulting in negligible accumulation of rotation. In contrast, significant rotation was accumulated for an asymmetric structure as a result of the P -delta effect due to the eccentric mass.
Earthquake, Liquefaction, Basement, Displacement, Rotation, Centrifuge modelling
The first author would like to thank the Engineering and Physical Science Research Council (EPSRC), United Kingdom, for their financial support through a Doctoral Training Account (DTA) studentship.
External DOI: https://doi.org/10.1016/j.soildyn.2019.01.006
This record's URL: https://www.repository.cam.ac.uk/handle/1810/289130
Attribution-NonCommercial-NoDerivatives 4.0 International
Licence URL: http://creativecommons.org/licenses/by-nc-nd/4.0/
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