Verification of design procedures of structural stability using probabilistic methods of reliability analysis

2012 ◽  
Author(s):  
Abayomi Omishore
Keyword(s):  
Reliability Analysis ◽  
Structural Stability ◽  
Probabilistic Methods ◽  
Design Procedures

Vehicle Risk Level Estimation by Using Experimental Trajectories in Bend

2011 ◽  
Author(s):  
Abdourahmane Koita ◽  
Dimitri Daucher ◽  
Michel Fogli
Keyword(s):  
Probability Density ◽  
Reliability Analysis ◽  
Probabilistic Models ◽  
Hermite Polynomials ◽  
Probabilistic Methods ◽  
Risk Level ◽  
General Context ◽  
Risk Levels ◽  
Modelling Uncertainties ◽  
Non Gaussian

This paper tackles the general context of road safety, focussing on the light vehicles safety in bends. It consists to use a reliability analysis in order to estimate the failure probability of vehicle trajectories. Firstly, we build probabilistic models able to describe measured trajectories in a given bend. The models are transforms of scalar normalized second order stochastic processes which are stationary, ergodic and non-Gaussian. The process is characterized by its probability density function and its power spectral density estimated starting from the experimental trajectories. The probability density is approximated by a development on the Hermite polynomials basis. The second part is devoted to apply a reliability strategy intended to associate a risk level to each class of trajectories. Based on the joint use of probabilistic methods for modelling uncertainties, reliability analysis for assessing risk levels and statistics for classifying the trajectories, this approach provides a realistic answer to the tackled problem.

SAFETY AND RELIABILITY OF BREAKWATERS

1984 ◽  
Vol 1 (19) ◽  
pp. 164 ◽  
Author(s):  
A. Mol ◽  
R.L. Groeneveld ◽  
A.J. Waanders
Keyword(s):  
Reliability Analysis ◽  
Probability Distributions ◽  
Simulation Method ◽  
Design Parameters ◽  
Suggested Approach ◽  
Design Procedures ◽  
Traditional Design ◽  
Safety And Reliability ◽  
Event Trees ◽  
Rubble Mound Breakwaters

This paper discusses the need to incorporate a reliability analysis in the design procedures for rubble mound breakwaters. Such an analysis is defined and a suggested approach is outlined. Failure mechanisms are analysed and categorized in Damage Event Trees. The probability of failure is computed using a level III simulation method to include time and cumulative effects and to account for skewed probability distributions. Typical outputs of the computer program are shown and compared with results according to traditional design approaches. The paper concludes that there is a definite need to include reliability analysis in the design procedures for larger breakwaters and such an analysis must consider the accuracy of design parameters and methods.

scholarly journals Proposal of the Method for Multidisciplinary Reliability Analysis Based on Statistical and Probabilistic Methods

2005 ◽  
Vol 71 (705) ◽  
pp. 740-748
Author(s):  
Kenji HIROHATA ◽  
Katsumi HISANO ◽  
Hiroyuki TAKAHASHI ◽  
Minoru MUKAI ◽  
Noriyasu KAWAMURA ◽  
...  
Keyword(s):  
Reliability Analysis ◽  
Probabilistic Methods

scholarly journals Assessment of Reinforced Concrete Structures under Wind and Earthquake Using Different Design Methods

2021 ◽  
Author(s):  
Maha Al-Soudani ◽  
◽  
Aamer Najim Abbas ◽  
Hesham A. Numan ◽  
◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Structural Stability ◽  
Seismic Activity ◽  
Lateral Displacement ◽  
European American ◽  
Reinforced Concrete Structures ◽  
Design Procedures ◽  
Wind Analysis ◽  
The Difference ◽  
Design Calculations

The effect of wind and earthquake on the structures can be specified briefly by the effect of horizontal forces act on structures varied in its value and direction depending on the location and the distance from the sea in case of wind load and the seismic activity of the region in case of an earthquake. These horizontal forces conflict in concept with the structural stability of the structure. Most of the designer engineers adopted the vertical forces only in design calculations and neglecting the horizontal forces based on the opinion that the horizontal forces are not effective. This design concept is wrong, thus it is necessary to take into consideration the effect of these horizontal forces on structures, especially there are a number of earthquakes took placed in different places of Iraq. So, it is necessary for dealing seriously with design calculations according to local and international common codes. This investigation presents a review for the design procedures of different codes, solved design examples according to different local and international codes, the difference in design between the horizontal and vertical forces and the methods to minimize the effect of wind and earthquake on structures. Data of 12 floors symmetrical building were adopted in seismic and wind analysis. The results of SAP2000 were compared with international common codes such as European, American, Brazilian, Italian and Romanian codes. The results of calculations revealed that there are some variations in the analysis of different codes. Romanian code is more conservative in calculating the lateral displacement and forces, while Italian code was low conservative.

scholarly journals Reliability of Concrete Elements Designed for Alternative Load Combinations Provided in Eurocodes

10.14311/382 ◽  
2003 ◽  
Vol 43 (1) ◽  
Author(s):  
M. Holický ◽  
J. Marková
Keyword(s):  
Structural Design ◽  
Structural Reliability ◽  
Reliability Theory ◽  
Probabilistic Methods ◽  
European Standard ◽  
Limit States ◽  
Design Procedures ◽  
Characteristic Features ◽  
Concrete Elements ◽  
Ultimate Limit

The basic European standard for design of buildings and other engineering works, EN 1990 "Basis of structural design", provides alternative design procedures, for which national choice is allowed. One of the most important questions concerns three fundamental combinations of actions for persistent and transient design situations in the Ultimate limit states. Simple examples of reinforced concrete elements show, that the alternative load combinations may lead to considerably different reliability levels. Probabilistic methods of structural reliability theory are used to identify characteristic features of each combination and to formulate recommendations. However, further calibration studies are urgently needed in order to prepare National annexes to EN 1990 on time.

Reliability Analysis for the Feeder Subject to Wall Loss

2012 ◽  
Author(s):  
Min Wang ◽  
Xianxun Yuan ◽  
Xinjian Duan ◽  
Michael J. Kozluk
Keyword(s):  
Reliability Analysis ◽  
Wall Thickness ◽  
Structural Reliability ◽  
Structural Integrity ◽  
Degradation Mechanism ◽  
Linear Regression Analysis ◽  
Probabilistic Methods ◽  
Piping System ◽  
Wall Thinning ◽  
Reliability Method

Wall thinning is one of the most common degradation mechanisms experienced in piping system. Gradual wall thinning can cause the pipe to leak or in the worst scenario, to rupture. Wall thinning due to FAC of feeder pipe in CANDU® reactors has been identified as an active degradation mechanism, and local thinning has been observed in various locations such as elbows/bends and Grayloc. The assessment of structural integrity is important for the fitness-for-service of those feeders whose wall thickness is predicted to be lower than the required minimum wall thickness before their design life and therefore subject to costly repair or replacement. Among various probabilistic methods, the first-order reliability method (FORM) is adopted in this paper to evaluate the structural reliability of feeders subject to wall thinning, while the wall thickness, one of the key parameters in the reliability analysis, is modeled by three methods based on the wall thickness measurements. They are linear regression analysis, random thinning rate analysis and gamma process modeling. The difference and limitation of the methods for reliability analysis are addressed.

Probabilistic Computational Methods in Structural Failure Analysis

2015 ◽  
Vol 06 (03) ◽  
pp. 1550006 ◽  
Author(s):  
Martin Krejsa ◽  
Juraj Kralik
Keyword(s):  
Failure Analysis ◽  
Computational Model ◽  
Reliability Analysis ◽  
Numerical Integration ◽  
Probabilistic Method ◽  
Random Variable ◽  
Probabilistic Methods ◽  
Structural Failure ◽  
Software Applications ◽  
Reliability Assessments

Probabilistic methods are used in engineering where a computational model contains random variables. Each random variable in the probabilistic calculations contains uncertainties. Typical sources of uncertainties are properties of the material and production and/or assembly inaccuracies in the geometry or the environment where the structure should be located. The paper is focused on methods for the calculations of failure probabilities in structural failure and reliability analysis with special attention on newly developed probabilistic method: Direct Optimized Probabilistic Calculation (DOProC), which is highly efficient in terms of calculation time and the accuracy of the solution. The novelty of the proposed method lies in an optimized numerical integration that does not require any simulation technique. The algorithm has been implemented in mentioned software applications, and has been used several times in probabilistic tasks and probabilistic reliability assessments.

Time-resolved high-resolution electron microscopy of structural stability in mgo clusters

1996 ◽  
Vol 54 ◽  
pp. 672-673
Author(s):  
T. Kizuka ◽  
N. Tanaka
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Magnesium Oxide ◽  
Structural Stability ◽  
High Resolution Electron Microscopy ◽  
Video Tape ◽  
Solid State Physics ◽  
Time Resolved ◽  
Resolution Electron ◽  
Structural And Functional Properties

Structure and stability of atomic clusters have been studied by time-resolved high-resolution electron microscopy (TRHREM). Typical examples are observations of structural fluctuation in gold (Au) clusters supported on silicon oxide films, graphtized carbon films and magnesium oxide (MgO) films. All the observations have been performed on the clusters consisted of single metal element. Structural stability of ceramics clusters, such as metal-oxide, metal-nitride and metal-carbide clusters, has not been observed by TRHREM although the clusters show anomalous structural and functional properties concerning to solid state physics and materials science.In the present study, the behavior of ceramic, magnesium oxide (MgO) clusters is for the first time observed by TRHREM at 1/60 s time resolution and at atomic resolution down to 0.2 nm.MgO and gold were subsequently deposited on sodium chloride (001) substrates. The specimens, single crystalline MgO films on which Au particles were dispersed were separated in distilled water and observed by using a 200-kV high-resolution electron microscope (JEOL, JEM2010) equipped with a high sensitive TV camera and a video tape recorder system.

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