scholarly journals Dynamic Analyses of Jacket Type Offshore Platforms against Progressive Collapse Considering Pile-Soil-Structure Interaction

2019 ◽  
Vol 12 (Summer and Autumn 2019) ◽  
pp. 31-40
Author(s):  
Hossein Gholami ◽  
Behrouz Asgarian ◽  
Farshad Hashemi Rezvani ◽  
◽  
◽  
...  
Keyword(s):  
Soil Structure ◽  
Progressive Collapse ◽  
Soil Structure Interaction ◽  
Offshore Platforms ◽  
Structure Interaction ◽  
Dynamic Analyses

scholarly journals Progressive Collapse Assessment of Reinforced Concrete Frame Structure with and without Considering Actual Soil Condition

10.29007/p792 ◽  
2018 ◽  
Author(s):  
Bhavik Patel ◽  
Bharat Shah
Keyword(s):  
Reinforced Concrete ◽  
Soil Structure ◽  
Progressive Collapse ◽  
Frame Structure ◽  
Nonlinear Static Analysis ◽  
Soil Structure Interaction ◽  
Reinforced Concrete Frame ◽  
Structure Interaction ◽  
Concrete Frame ◽  
Collapse Assessment

It has been found that the forces in the members of frame structures considering soil-structureinteraction, differs than conventional method of analysis. Analysis considering soil-structure interaction is time-consuming process; hence, if the relation between two methods established, then by using conventional method, realistic results can be obtained. In the present work, effort has been made to study the impact of soil-structure interaction on the progressive collapse assessment of reinforced concrete frame structure (building). It is clear that the differential settlement of the foundation changes the load transfer system of the super structure. Differential settlement depends on the properties of the soil below foundation and the stiffness of the super structure. The objective of this study is to quantify the change in the reaction at the foundation level due to soil structure interaction. To achieve this target, the Winkler approach is used. In this model, soil below foundation is modelled as idealized springs. To study the effect of failure of load carrying elements i.e. columns on the entire structure; 15 storey moment resistant RC buildings is considered. The building is modelled and analyzed for progressive collapse using the structural analysis and design software SAP2000. Nonlinear static analysis is performed to understand the progressive collapse phenomena. The nonlinear static analysis is found to be the most efficient method for progressive collapse assessment of the reinforced concrete structure with consideration of soil effect. General Service Administration (GSA 2003) guideline is used for loading and procedure to assess the potential towards progressive collapse of structure.

Sensitivity Study on Nonlinear Seismic Response of Offshore Jackets Due to Different Earthquake Events

2007 ◽  
Author(s):  
Mehrdad Kimiaei
Keyword(s):  
Seismic Response ◽  
Soil Structure ◽  
Sensitivity Study ◽  
Soil Structure Interaction ◽  
Main Concern ◽  
Fe Model ◽  
Offshore Platforms ◽  
Structure Interaction ◽  
Nonlinear Seismic Response ◽  
Earthquake Design

Earthquake design of offshore platforms is one of the main parts in offshore platforms design on which seismic soil pile structure interaction could be the main concern. In seismically active areas, it is often necessary to perform a dynamic analysis that accounts for nonlinear pile soil structure interaction effects. Based on a previously developed numerical BNWF-FE model for nonlinear seismic response of offshore platforms, in this paper, sensitivity of seismic response of an existing sample offshore platform to different earthquake events (with different duration and different frequency contents) together with the sensitivity of the results to the model main parameters are investigated.

Non Linear Seismic Pile Soil Structure Interaction Analysis of Piles in Offshore Platforms

2004 ◽  
Author(s):  
Mehrdad Kimiaei ◽  
Mohsen Ali Shayanfar ◽  
M. Hesham El Naggar ◽  
Ali Akbar Aghakouchak
Keyword(s):  
Soil Structure ◽  
Seismic Analysis ◽  
Interaction Analysis ◽  
Site Response ◽  
Free Field ◽  
Soil Structure Interaction ◽  
Model Parameters ◽  
Winkler Foundation ◽  
Offshore Platforms ◽  
Structure Interaction

Pile supported offshore platforms in seismically active areas should be designed to survive severe earthquake excitations with no global structural failure. It is often required to perform nonlinear seismic analysis of offshore platforms that accounts for soil nonlinearity, discontinuity condition at pile soil interfaces, energy dissipation through soil radiation damping and structural nonlinear behaviours of the piles. In this study a BNWF (Beam on Nonlinear Winkler Foundation) model is incorporated into a finite element program (ANSYS) and it is used to compute the lateral response of piles subjected to seismic loading. The soil stiffness is established using the P-Y curve. The results of equivalent linear earthquake free field ground motion analyses are used as the input excitations at support nodes of the model. The components and advantages of this practical ANSYS model in seismic pile soil structure interaction analyses are discussed and addressed in detail. Computed responses compared well with the experimental test results. Sensitivity of the results to model parameters and site response calculations are evaluated.

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