A simplified nonlinear sway-rocking model for evaluation of seismic response of structures on shallow foundations

Lu, Yang and Marshall, Alec M. and Hajirasouliha, Iman (2016) A simplified nonlinear sway-rocking model for evaluation of seismic response of structures on shallow foundations. Soil Dynamics and Earthquake Engineering, 81 . pp. 14-26. ISSN 0267-7261

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Abstract

This paper presents a simplified Nonlinear Sway-Rocking model as a preliminary design tool for seismic soil-structure interaction analysis. The proposed model is intended to capture the nonlinear load-displacement response of shallow foundations during strong earthquake events where foundation bearing capacity is fully mobilised. Emphasis is given to heavily-loaded structures resting on a saturated clay half-space. The variation of soil stiffness and strength with depth, referred to as soil non-homogeneity, is considered in the model. Although independent springs are utilised for each of the swaying and rocking motions, coupling between these motions is taken into account by expressing the load-displacement relations as functions of the factor of safety against vertical bearing capacity failure (FSv) and the moment-to-shear ratio (M/H). The simplified model has been calibrated and validated against results from a series of static push-over and dynamic analyses performed using a more rigorous finite-difference numerical model. Despite some limitations of the current implementation, the concept of this model gives engineers more degrees of freedom in defining their own model components, providing a good balance between simplicity, flexibility and accuracy.

Item Type: Article
Keywords: Soil-structure interaction; Simplified model; Nonlinear analysis; Soil non-homogeneity; Coupled sway-rocking response
Schools/Departments: University of Nottingham, UK > Faculty of Engineering > Department of Civil Engineering
Identification Number: https://doi.org/10.1016/j.soildyn.2015.11.002
Depositing User: Eprints, Support
Date Deposited: 07 Nov 2016 13:00
Last Modified: 05 Dec 2016 02:26
URI: http://eprints.nottingham.ac.uk/id/eprint/38553

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