scholarly journals Performance and Risk Assessment of Soil-Structure Interaction Systems Based on Finite Element Reliability Methods

2014 ◽  
Vol 2014 ◽  
pp. 1-16 ◽  
Author(s):  
Quan Gu
Keyword(s):  
Risk Assessment ◽  
Finite Element ◽  
Reliability Analysis ◽  
Soil Structure ◽  
Soil Structure Interaction ◽  
Structure Interaction ◽  
Analysis Methods ◽  
Reliability Method ◽  
Reliability Methods ◽  
Time Invariant

In the context of performance-based earthquake engineering, reliability method has been of significant importance in performance and risk assessment of structures or soil-structure interaction (SSI) systems. The finite element (FE) reliability method combines FE analysis with state-of-the-art methods in reliability analysis and has been employed increasingly to estimate the probability of occurrence of failure events corresponding to various hazard levels (e.g., earthquakes with various intensity). In this paper, crucial components for FE reliability analysis are reviewed and summarized. Furthermore, recent advances in both time invariant and time variant reliability analysis methods for realistic nonlinear SSI systems are presented and applied to a two-dimensional two story building on layered soil. Various time invariant reliability analysis methods are applied, including the first-order reliability method (FORM), importance sampling method, and orthogonal plane sampling (OPS) method. For time variant reliability analysis, an upper bound of the failure probability is obtained from numerical integration of the mean outcrossing rate (MOCR). The MOCR is computed by using FORM analysis and OPS analysis. Results by different FE reliability methods are compared in terms of accuracy and computational cost. This paper provides valuable insights for reliability based probabilistic performance and risk assessment of SSI systems.

State-of-the-Art Techniques for Seismic Soil-Structure Interaction Analysis of Steel Gravity Structures

2014 ◽  
Author(s):  
Frederick Tajirian ◽  
Mansour Tabatabaie ◽  
Basilio Sumodobila ◽  
Stephen Paulson ◽  
Bill Davies
Keyword(s):  
Soil Structure ◽  
State Of The Art ◽  
Interaction Analysis ◽  
Layered Soil ◽  
Soil Structure Interaction ◽  
Soil System ◽  
Cyclonic Storm ◽  
Structure Interaction ◽  
Analysis Methods ◽  
Moderate Seismicity

The design of steel jacket fixed offshore structures in zones of moderate seismicity is typically governed by Metocean loads. In contrast the steel gravity structure (SGS) presented in this paper, is a heavy and stiff structure. The large mass results in foundation forces from seismic events that may exceed those created by extreme cyclonic storm events. When computing the earthquake response of such structures it is essential to account for soil-structure interaction (SSI) effects. Seismic SSI analysis of the SGS platform was performed using state-of-the-art SSI software, which analyzed a detailed three-dimensional model of the SGS supported on layered soil system. The results of this analysis were then compared with those using industry standard impedance methods whereby the layered soil is replaced by equivalent foundation springs (K) and damping (C). Differences in calculated results resulting from the different ways by which K and C are implemented in different software are presented. The base shear, overturning moment, critical member forces and maximum accelerations were compared for each of the analysis methods. SSI resulted in significant reduction in seismic demands. While it was possible to get reasonable alignment using the different standard industry analysis methods, this was only possible after calibrating the KC foundation model with software that rigorously implements SSI effects. Lessons learned and recommendations for the various methods of analysis are summarized in the paper.

Seismic Response Analysis of Soil-Structure Interaction on Base Isolation Structure

2013 ◽  
Vol 663 ◽  
pp. 87-91
Author(s):  
Ying Bo Pang
Keyword(s):  
Finite Element ◽  
Seismic Response ◽  
Soil Structure ◽  
Base Isolation ◽  
Soil Structure Interaction ◽  
Response Analysis ◽  
Analysis Model ◽  
Seismic Response Analysis ◽  
Structure Interaction ◽  
Calculation Results

As an effective way of passive damping, isolation technology has been widely used in all types of building structures. Currently, for its theoretical analysis, it usually follows the rigid foundation assumption and ignores soil-structure interaction, which results in calculation results distortion in conducting seismic response analysis. In this paper, three-dimensional finite element method is used to establish finite element analysis model of large chassis single-tower base isolation structure which considers and do not consider soil-structure interaction. The calculation results show that: after considering soil-structure interaction, the dynamic characteristics of the isolation structure, and seismic response are subject to varying degrees of impact.

Effect of Pile-Soil-Structure Interaction on the Cable-Stayed Bridge in Response to the Earthquake

2014 ◽  
Vol 539 ◽  
pp. 731-735 ◽  
Author(s):  
Yu Chen
Keyword(s):  
Finite Element ◽  
Seismic Response ◽  
Soil Structure ◽  
Response Spectrum ◽  
Three Dimensional ◽  
Soil Structure Interaction ◽  
Structure Interaction ◽  
Finite Element Software ◽  
Cable Stayed Bridge ◽  
Three Dimensional Finite Element

In this thesis, based on the design of a 140+90m span unusual single tower and single cable plane cable-stayed bridge, free vibration characteristics and seismic response are investigated; three dimensional finite element models of a single tower cable-stayed bridge with and without the pile-soil-structure interaction are established respectively by utilizing finite element software MIDAS/CIVIL, seismic response of Response spectrum and Earthquake schedule are analyzed respectively and compared. By the comparison of the data analysis, for small stiffness span cable-stayed bridge, the pile-soil-structure interaction can not be ignored with calculation and analysis of seismic response.

Computer Simulation of the Shaking Table Tests on Harder Soil-Structure Interaction System

2011 ◽  
Vol 261-263 ◽  
pp. 1619-1624
Author(s):  
Pei Zhen Li ◽  
Jing Meng ◽  
Peng Zhao ◽  
Xi Lin Lu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Soil Structure ◽  
Shaking Table Test ◽  
Shaking Table ◽  
Soil Structure Interaction ◽  
Shaking Table Tests ◽  
Site Condition ◽  
Element Analysis ◽  
Structure Interaction

Shaking table test on soil-structure interaction system in harder site condition is presented briefly in this paper. Three-dimensional finite element analysis on shaking table test is carried out using ANSYS program. The surface-to-surface contact element is taken into consideration for the nonlinearity of the state of the interface of the soil-pile and an equivalent linear model is used for soil behavior. By comparing the results of the finite element analysis with the data from shaking table tests, the computational model is validated. Based on the calculation results, the paper gives the seismic responses under the consideration of soil-structure interaction in harder site condition, including acceleration response, contact analysis on soil pile interface and so on.

scholarly journals Seismic risk assessment of bridges considering soil-structure interaction by means of a frequency - and intensity - dependent order reduction

2018 ◽  
Author(s):  
Νικόλαος Λεσγίδης
Keyword(s):  
Risk Assessment ◽  
Seismic Risk ◽  
Soil Structure ◽  
Order Reduction ◽  
Soil Structure Interaction ◽  
Seismic Risk Assessment ◽  
Structure Interaction

Όπως έχει παρατηρηθεί και στο παρελθόν η αλληλεπίδραση του εδάφους με την ανωδομή μιας κατασκευής γεφυροποιΐας μπορεί να επηρεάσει σημαντικά την απόκριση της κατά την διάρκεια μιας σεισμικής διέγερσης. Έτσι στην πλειοψηφία των περιπτώσεων κρίνεται απαραίτητη η ορθή και λεπτομερής προσομοίωση του φαινομένου αλληλεπίδρασης εδάφους κατασκευής τόσο κατά την διάρκεια του σχεδιασμού οσο και στην διαδικασία αποτίμησης σεισμικής επικινδυνότητας των κατασκευών γεφυροποιΐας. Διάφορες μεθοδολογίες μείωσης τάξης προσομοιώματος έχουν προταθεί με σκοπό την ελαχιστοποίηση του υπολογιστικού κόστους της προσομοίωσης της αλληλεπίδρασης εδάφους - κατασκευής. Ωστόσο οι προαναφερόμενες μεθοδολογίες αδυνατούν να διατηρήσουν το σύνολο των απαραίτητων ιδιοτήτων του ανελαστικού δυναμικού συστήματος με το πέρας της διαδικασίας μείωσης τάξης. Στην παρούσα διδακτορική διατριβή αναπτύσσεται μια ολοκληρωμένη μεθοδολογία μείωσης ανελαστικών δυναμικών συστημάτων αλληλεπίδρασης εδάφους – κατασκευής γεφυροποιΐας η οποία εξαλείφει τους προαναφερόμενους περιορισμούς. Τέλος πραγματοποιείται η υλοποίηση ενός ολοκληρωμένου και ενοποιημένου λογισμικού το οποίο εκτελεί αυτοματοποιημένα την αποτίμηση σεισμικής επικινδυνότητας κατασκευών γεφυροποιΐας με την χρήση της προτεινόμενης μεθοδολογίας μείωσης τάξης προσομοιώματος.

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