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Multivariate Global Sensitivity Analysis of Rocking Responses of Shallow Foundations under Controlled Rocking
A strong input energy, e.g., earthquake, may cause a partial separation of foundation from the underneath geomaterials. The concept of rocking behavior of shallow foundations has become popular in performance-based design (PBD) earthquake geotechnical specifications as an energy-dissipation mechanism. The two main performance indicators of the soil-structure systems during rocking are: (1) the moment capacity of the assembled soil-structure system that gradually mobilized under cyclic loading, and, (2) the dissipation of energy governed by the rotational moment hysteresis loops. The aim of this study is to evaluate the rocking responses of slender high-rise structures using global sensitivity analysis (GSA) methods. For this purpose, a finite element (FE) analysis database was generated using a wide range of geomaterials with different stiffness properties. To avoid the implementation of time-consuming FE analyses, random forest (RF) metamodels were developed using the synthetic database for the rocking responses. This paper discusses two different GSA methods including elementary effects (EE) and Sobol’s method to assess the impact of input parameters on the rocking responses. The results show that both methods are efficient in evaluating the impact of input parameters on the responses. EE requires a smaller number of generated samples and less computational effort. However, Sobol’s method is more efficient in measuring the joint effects despite the higher computational cost.
Multivariate Global Sensitivity Analysis of Rocking Responses of Shallow Foundations under Controlled Rocking
A strong input energy, e.g., earthquake, may cause a partial separation of foundation from the underneath geomaterials. The concept of rocking behavior of shallow foundations has become popular in performance-based design (PBD) earthquake geotechnical specifications as an energy-dissipation mechanism. The two main performance indicators of the soil-structure systems during rocking are: (1) the moment capacity of the assembled soil-structure system that gradually mobilized under cyclic loading, and, (2) the dissipation of energy governed by the rotational moment hysteresis loops. The aim of this study is to evaluate the rocking responses of slender high-rise structures using global sensitivity analysis (GSA) methods. For this purpose, a finite element (FE) analysis database was generated using a wide range of geomaterials with different stiffness properties. To avoid the implementation of time-consuming FE analyses, random forest (RF) metamodels were developed using the synthetic database for the rocking responses. This paper discusses two different GSA methods including elementary effects (EE) and Sobol’s method to assess the impact of input parameters on the rocking responses. The results show that both methods are efficient in evaluating the impact of input parameters on the responses. EE requires a smaller number of generated samples and less computational effort. However, Sobol’s method is more efficient in measuring the joint effects despite the higher computational cost.
Multivariate Global Sensitivity Analysis of Rocking Responses of Shallow Foundations under Controlled Rocking
Fathi, Aria (author) / Mazari, Mehran (author) / Saghafi, Mahdi (author)
Eighth International Conference on Case Histories in Geotechnical Engineering ; 2019 ; Philadelphia, Pennsylvania
Geo-Congress 2019 ; 490-498
2019-03-21
Conference paper
Electronic Resource
English
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