A simplified Nonlinear Sway-Rocking model for evaluation of seismic response of structures on shallow foundations

Lu, Yang; Marshall, Alec M.; Hajirasouliha, Iman

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.

Citation

Lu, Y., Marshall, A. M., & Hajirasouliha, I. (2016). A simplified Nonlinear Sway-Rocking model for evaluation of seismic response of structures on shallow foundations. Soil Dynamics and Earthquake Engineering, 81, 14-26. https://doi.org/10.1016/j.soildyn.2015.11.002

• Journal Article Type: Article
• Acceptance Date: Nov 7, 2015
• Online Publication Date: Dec 4, 2015
• Publication Date: 2016-02
• Deposit Date: Nov 7, 2016
• Publicly Available Date: Nov 7, 2016
• Journal: Soil Dynamics and Earthquake Engineering
• Print ISSN: 0267-7261
• Electronic ISSN: 0267-7261
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 81
• Pages: 14-26
• DOI: https://doi.org/10.1016/j.soildyn.2015.11.002
• Keywords: Soil-structure interaction; Simplified model; Nonlinear analysis; Soil non-homogeneity; Coupled sway-rocking response
• Public URL: https://nottingham-repository.worktribe.com/output/978484
• Publisher URL: http://www.sciencedirect.com/science/article/pii/S0267726115002663