scholarly journals Analytical Fragility Curves of Pile Foundations with Soil-Structure Interaction (SSI)

Geosciences ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 66
Author(s):  
Davide Forcellini
Keyword(s):  
Soil Structure ◽  
Fragility Curves ◽  
Pile Foundations ◽  
Soil Structure Interaction ◽  
Cohesionless Soil ◽  
Seismic Behaviour ◽  
Limit States ◽  
Linear Dynamic ◽  
Ductility Factor ◽  
Dynamic Analyses

Pile foundations is a well-studied technique with many applications and its benefits on structures have been widely studied in the literature. In particular, the mutual effects of pile flexibility and soil deformability may significantly modify the seismic behaviour of superstructures. In order to consider the uncertainties that are connected with these issues, the paper applies the probabilistic-based approach of fragility curves by proposing three limit states based on ductility factor. Non-linear dynamic analyses were performed with OpenSees PL to assess the potentialities of three pile configurations founded on three cohesionless soil with different deformability.

scholarly journals Seismic Vulnerability Assessment of High-Speed Railway Bridges Using Fragility Curves and Considering Soil-Structure Interaction

2020 ◽  
Vol 16 (1) ◽  
pp. 39-48
Author(s):  
Parham Bakhtiari ◽  
Khosro Bargi
Keyword(s):  
High Speed ◽  
Soil Structure ◽  
Seismic Vulnerability ◽  
Fragility Curves ◽  
Damage Index ◽  
Soil Structure Interaction ◽  
Limit States ◽  
High Speed Railway ◽  
Railway Bridges ◽  
Structure Interaction

AbstractThe assessment of the seismic behavior of the high-speed railway bridges is necessary because of the strategic essence of these structures. Evaluating and predicting damages of the bridges that originated by earthquakes with various intensities can provide useful information, which is very helpful in the management of the possible crises. One of the most useful mechanisms for estimating earthquake damages to these bridges is the development of fragility curves for them. Studies on the production of fragility curves on the high-speed railway bridges are limited. In this research, the fragility curve is plotted for two high-speed railway bridges with different pier heights. Due to the differences in the height of these bridges, a comparison of the performance of these structures is also shown. The model of the high-speed railway bridge was created for each model separately in the SeismoStruct software. The soil-structure interaction is also modeled as springs, and its effects are considered. Nonlinear models are also used to model concrete and steel materials. Then, the incremental dynamic analysis was performed under different ground motion records. By using the obtained data from the analysis, appropriate damage states were selected, and finally, the fragility curves were plotted for different performance limit states. The results showed that with increasing pier height, the damage index was raised and for a constant probability of exceedance, the taller pier is demanded a lower spectral acceleration to achieve a performance level.

scholarly journals The Role of Soil Structure Interaction in the Fragility Assessment of HP/HT Unburied Subsea Pipelines

2022 ◽  
Vol 10 (1) ◽  
pp. 110
Author(s):  
Davide Forcellini ◽  
Daniele Mina ◽  
Hassan Karampour
Keyword(s):  
Soil Structure ◽  
Seismic Vulnerability ◽  
Fragility Curves ◽  
Failure Criteria ◽  
Soil Structure Interaction ◽  
Limit States ◽  
Structure Interaction ◽  
Definition Of ◽  
Subsea Pipelines

Subsea high pressure/high temperature (HP/HT) pipelines may be significantly affected by the effects of soil structure interaction (SSI) when subjected to earthquakes. Numerical simulations are herein applied to assess the role of soil deformability on the seismic vulnerability of an unburied pipeline. Overcoming most of the contributions existing in the literature, this paper proposes a comprehensive 3D model of the system (soil + pipeline) by performing OpenSees that allows the representation of non-linear mechanisms of the soil and may realistically assess the induced damage caused by the mutual interaction of buckling and seismic loads. Analytical fragility curves are herein derived to evaluate the role of soil structure interaction in the assessment of the vulnerability of a benchmark HP/HT unburied subsea pipeline. The probability of exceeding selected limit states was based on the definition of credited failure criteria.

Influence of soil conditions on the seismic behaviour of two cable-stayed bridges

1995 ◽  
Vol 22 (5) ◽  
pp. 1021-1040 ◽  
Author(s):  
Mohamed Elassaly ◽  
Amin Ghali ◽  
Mamdouh M. Elbadry
Keyword(s):  
Soil Structure ◽  
Seismic Waves ◽  
Seismic Analysis ◽  
Soil Structure Interaction ◽  
Soil Conditions ◽  
Seismic Behaviour ◽  
Internal Forces ◽  
Time Required ◽  
Cable Stayed Bridges

The results of a case study of the internal forces caused by earthquake in two examples of cable-stayed bridges are presented. A comparison is made between the behaviour of a model in which the structure is idealized without the foundation system and a model in which both the structure and the supporting foundation are idealized. The effects of varying the soil conditions on the seismic response are assessed. Also, the effects of out-of-phase support movements, caused by the lapse of time required for the seismic waves to travel from one support to the other, are considered. It is concluded that the effects of these parameters are significant and should not be ignored in the seismic analysis of cable-stayed bridges. Key words: bridges, cable-stayed, dynamic, earthquake, internal forces, seismic, soil–structure interaction.

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