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A simplified Nonlinear Sway-Rocking model for evaluation of seismic response of structures on shallow foundations
https://orcid.org/0000-0002-6091-1231
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.
Highlights A simplified model is developed to capture nonlinear seismic foundation response. The effects of soil nonlinearity and heterogeneity are accounted for in the model. A unique dimensionless backbone is employed for each of sway and rocking motions. The FLAC3D numerical code is used to calibrate and validate the simplified model.
A simplified Nonlinear Sway-Rocking model for evaluation of seismic response of structures on shallow foundations
https://orcid.org/0000-0002-6091-1231
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.
Highlights A simplified model is developed to capture nonlinear seismic foundation response. The effects of soil nonlinearity and heterogeneity are accounted for in the model. A unique dimensionless backbone is employed for each of sway and rocking motions. The FLAC3D numerical code is used to calibrate and validate the simplified model.
A simplified Nonlinear Sway-Rocking model for evaluation of seismic response of structures on shallow foundations
https://orcid.org/0000-0002-6091-1231
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.
Highlights A simplified model is developed to capture nonlinear seismic foundation response. The effects of soil nonlinearity and heterogeneity are accounted for in the model. A unique dimensionless backbone is employed for each of sway and rocking motions. The FLAC3D numerical code is used to calibrate and validate the simplified model.
A simplified Nonlinear Sway-Rocking model for evaluation of seismic response of structures on shallow foundations
Lu, Yang (author) / Marshall, Alec M. (author) / Hajirasouliha, Iman (author)
Soil Dynamics and Earthquake Engineering ; 81 ; 14-26
2015-11-07
13 pages
Article (Journal)
Electronic Resource
English
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