Safety Format and Acceptance Criteria for Analysis of Marine Structures Using Non-Linear Methods

2011 ◽  
Author(s):  
Gunnar Solland ◽  
Atle Johansen ◽  
Gudfinnur Sigurdsson
Keyword(s):  
Cross Sections ◽  
Structural Integrity ◽  
Linear Analysis ◽  
Acceptance Criteria ◽  
Existing Structures ◽  
Analysis Methods ◽  
Structural Details ◽  
Non Linear ◽  
Definition Of ◽  
Novel Design

This paper deals with how structural integrity can be documented by use of non-linear analysis methods. The focus is on structures that are exposed to extreme environmental loads. In order to prove the structural integrity for aging offshore installation, non-linear analysis methods are finding increased applications. The codes ISO 19902, API RP 2A and Norsok N-006 give recommendations for use of non-linear methods for capacity checks of existing structures. This paper discusses the different safety formats given in these codes. Also presented is how practical acceptance criteria that have to be applied in conjunction with such analyses can be formulated. The topics that are dealt with are issues that the analyst performing such analyses needs to address like: definition of failure, representation of joints, issues on cyclic loading, instability of cross sections and member buckling. In cases of novel design solutions or special structural details, non-linear analysis methods may also find application when planning new structures.

Neural Network Subtyping of Depression

1998 ◽  
Vol 32 (5) ◽  
pp. 687-694 ◽  
Author(s):  
Tony M. Florio ◽  
Gordon Parker ◽  
Marie-Paule Austin ◽  
Ian Hickie ◽  
Philip Mitchell ◽  
...  
Keyword(s):  
Neural Network ◽  
Clinical Decision Making ◽  
Linear Models ◽  
Function Analysis ◽  
Clinical Decision ◽  
Linear Analysis ◽  
Linear Discriminant ◽  
Non Linear ◽  
Depressive Subtypes ◽  
Definition Of

Objective: To examine the applicability of a neural network classification strategy to examine the independent contribution of psychomotor disturbance (PMD) and endogeneity symptoms to the DSM-III-R definition of melancholia. Method: We studied 407 depressed patients with the clinical dataset comprising 17 endogeneity symptoms and the 18-item CORE measure of behaviourally rated PMD. A multilayer perceptron neural network was used to fit non-linear models of varying complexity. A linear discriminant function analysis was also used to generate a model for comparison with the non-linear models. Results: Models (linear and non-linear) using PMD items only and endogeneity symptoms only had similar rates of successful classification, while non-linear models combining both PMD and symptom scores achieved the best classifications. Conclusions: Our current non-linear model was superior to a linear analysis, a finding which may have wider application to psychiatric classification. Our non-linear analysis of depressive subtypes supports the binary view that melancholic and non-melancholic depression are separate clinical disorders rather than different forms of the same entity. This study illustrates how non-linear modelling with neural networks is a potentially fruitful approach to the study of the diagnostic taxonomy of psychiatric disorders and to clinical decision-making.

scholarly journals UV-vis in situ spectrometry data mining through linear and non linear analysis methods

DYNA ◽  
2014 ◽  
Vol 81 (185) ◽  
pp. 182 ◽  
Author(s):  
Liliana Lopez-Kleine ◽  
Andrés Torres
Keyword(s):  
Data Mining ◽  
Linear Analysis ◽  
Analysis Methods ◽  
Non Linear

Calculation of Resistance and Non-Linear Analysis of Reinforced Concrete Beams

2019 ◽  
Vol 292 ◽  
pp. 140-145
Author(s):  
Pavlina Mateckova ◽  
Lucie Mynarzova ◽  
Oldrich Sucharda ◽  
Vlastimil Bilek
Keyword(s):  
Reinforced Concrete ◽  
Cross Sections ◽  
Concrete Beams ◽  
Numerical Models ◽  
Material Model ◽  
Linear Analysis ◽  
Reinforced Concrete Beams ◽  
Modes Of Failure ◽  
Eurocode 2 ◽  
Non Linear

This paper deals with analysis of set of reinforced concrete beams. Loading experiments of these beams were carried out and the results were documented and published earlier. Experiments involve several variants of spans, cross-sections and reinforcement so that various modes of failure of reinforced concrete structures are achieved. This paper compares the resistance of particular beams defined according to valid standard Eurocode 2 with non-linear analysis using advanced spatial 3D numerical models Cementitious material model based on fracture mechanics implemented in ATENA software. This paper outlines the wider evaluation of failure mode of beam and comparison of different calculations of resistance of the cross-section.

Effect of decimation on the classification rate of non-linear analysis methods applied to uterine EMG signals

IRBM ◽  
2013 ◽  
Vol 34 (4-5) ◽  
pp. 326-329 ◽  
Author(s):  
A. Diab ◽  
M. Hassan ◽  
B. Karlsson ◽  
C. Marque
Keyword(s):  
Linear Analysis ◽  
Classification Rate ◽  
Analysis Methods ◽  
Non Linear

scholarly journals Non Linear Analysis of Single Storey RC front Wall under Blast Loading

10.29007/hlgv ◽  
2018 ◽  
Author(s):  
Kavita Singh ◽  
Hardik Solanki ◽  
Anil Belani
Keyword(s):  
Structural Design ◽  
Structural Integrity ◽  
Blast Loading ◽  
Linear Analysis ◽  
Front Wall ◽  
Structural System ◽  
Ansys Software ◽  
Blast Effects ◽  
Non Linear ◽  
Blast Resistant Design

In modern days many civilian structures need shielding against blast effects. Past incidences of terrorist activities have increased the awareness towards the structural design to mitigate the effect of explosion and prevention of collapse of the building. The objective primary of blast resistant design is to prevent the collapse of the structural system and to maintain structural integrity through ductile and redundant behaviour. The primary aim of present work is to analyze the RC wall having SDOF with both end fixed under blast loading using ANSYS software.

ON THE PHYSICALLY NON‐LINEAR ANALYSIS OF CYCLIC LOADED REINFORCED CONCRETE CROSS‐SECTIONS WITH MATHEMATICAL OPTIMISATION

2009 ◽  
Vol 15 (2) ◽  
pp. 189-195 ◽  
Author(s):  
Erich Raue ◽  
Hans-Georg Timmler ◽  
Robert Garke
Keyword(s):  
Reinforced Concrete ◽  
Cross Sections ◽  
Deformation Behaviour ◽  
Residual Deformation ◽  
Linear Analysis ◽  
Total Potential ◽  
Non Linear ◽  
Concrete Damage ◽  
Residual Deformations ◽  
Mathematical Optimisation

In the paper, experimental results of tension member tests are used as a basis from which to develop an extended tension stiffening model for reinforced concrete, with emphasis on the specific concrete damage and the developments of residual deformations depending on the structural loading. Two characteristics are contained in the proposed model: one describes the residual deformation behaviour along the reinforcement accounting for the cracks that cannot be closed completely, while the other describes the degradation of the concrete stiffness. Within context of non‐linear analysis, the model is incorporated into an analytical approach, based on the LAG RANGE principle of minimum of total potential energy. The mechanical problem is solved with the application of the mathematical optimisation, using energy principles formulated as a kinematic formulation and transforming them into non‐linear optimisation problems. It was demonstrated, that this approach is eminently suitable for analysing pre‐damaged or pre‐loaded reinforced concrete cross‐sections under cyclic loading. Santrauka Pateikti tempiamųjų gelžbetoninių elementų eksperimentinių tyrimų rezultatai. Remiantis šiais rezultatais pasiūlytas supleišėjusio tempiamojo betono modelis, kuriame įvertinama betono pažaidų ir liekamųjų deformacijų didėjimo įtaka tempiamųjų gelžbetoninių elementų elgsenai. Modelis susideda iš dviejų komponentų: pirmasis aprašo išilginių liekamųjų deformacijų armatūroje kitimą, o antrasis betono įtakos elemento skerspjūvio deformacijoms mažėjimą. Netiesinė analizė atliekama taikant analizinį algoritmą, kuris pagrįstas Lagranžo potencinės energijos minimalumo principu. Mechaninė problema išspręsta taikant matematinį optimizavimą ir energinius principus. Pastarieji aprašyti kinematinėmis formuluotėmis jas perkeliant į netiesinio optimizavimo uždavinio algoritmus. Parodyta, kad pasiūlytas algoritmas gerai tinka cikline apkrova veikiamiems gelžbetoniniams elementams analizuoti.

Structural Integrity Management for a Large Pre-Stressed Concrete Floating Production Unit

2007 ◽  
Author(s):  
Bertrand Lanquetin ◽  
Pascal Collet ◽  
Jose Esteve
Keyword(s):  
High Performance ◽  
Structural Integrity ◽  
High Performance Concrete ◽  
Element Model ◽  
Linear Analysis ◽  
Production Unit ◽  
Non Linear ◽  
Integrity Management ◽  
Field Production

Offshore Floating Production Units, usually deployed under long-term plan, handle the field production so they cannot be easily removed for dry-docking and repair. In order to constantly analyze and monitor the condition of the units, a tailor-made methodology has been developed and implemented since 2004 for the Integrity Management of our Floating Units currently in operation. The paper gives a description of this methodology, and then focuses on how the methodology was deployed for the large pre-stressed concrete Floating Production Unit (FPU) located offshore Congo on N’KOSSA field. This FPU is the largest existing pre-stressed concrete Floating Production Unit, built with high performance concrete, installed offshore since 1996 in 170 m water depth. She has now accumulated 10 years of production. A significant part of the methodology is based on a full Finite Element Model (FEM) with non-linear analysis capacity for the concrete structure, incorporating a description of passive and active steel. There is often an anchored perception that a concrete unit is something not requiring attention once installed. This paper shows otherwise, underlining the complexity of modeling the highly non linear characteristics of pre-stressed high performance concrete and degradation modes.

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