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Showing 1 to 20 of 102 for “"Probability of failure"”.
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Prediction techniques for passive systems' probability of failure
This work fits into the wider framework of the on-going debate centered on Passive System reliability. Its aim is to provide insights into the design of a dependable method to evaluate the reliability of Passive Systems. In order to achieve this, a method is proposed that focuses on the …
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Time varying probability of failure of steel floor beams subjected to real fire
… for estimating the time-dependent reliability of steel beams under real fire conditions has been developed. It gives a more rational basis than time of failure modelling does for design. From risk modelling, some small resistance time from the probabilistic distribution times of failure can be …
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Risk assessment formulation for nitrate leaching
A framework for evaluating the risk of water pollution from the application of liquid dairy manure to agricultural fields was developed and applied. The GLEAMS (Groundwater Loading Effects of Agricultural Management Practices) (Ver 2.1) model was used to simulate NO₃-N leaching below the root zone …
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A Comparison of Water Main Failure Prediction Models in San Luis Obispo, CA
<p>This study compared four different water main failure prediction models: a statistically simple model, a statistically complex model, a statistically complex model with modifications termed the 2019 model, and an age-based model. The statistically complex models compute the probability of …
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Thermal fracture service life analysis of a case bonded visco-elastic cylinder
… crack growth rate relation will be used. The probability of failure, defined as the chance that a crack growing under the influence of such stresses exceeds the critical crack length, is calculated. A hazard function will be defined as the probability of failure during a single cycle after the …
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The Design and Analysis of Reliable Communication Networks
… is represented by a graph, and the problem of designing a network that will operate as reliably as possible is investigated. Failure of the network is associated with the removal of a set of nodes which disconnects the graph or by the removal of a set of edges which disconnects the graph. We …
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A Comparison of Risk Assessment Models for Pipe Replacement and Rehabilitation in a Water Distribution System
<p>A water distribution system is composed of thousands of pipes of varying materials, sizes, and ages. These pipes experience physical, environmental, and operational factors that cause deterioration and ultimately lead to their failure. Pipe deterioration results in increased break rates, …
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Reliability-based design of a retaining wall
… and bearing capacity, and it can fail by anyone of them. Since a great deal of uncertainty is involved in the analysis of the limit states, the use of detenninistic conventional safety factors may produce a misleading result. The main objective of this study is to develop a procedure for the …
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Reverse proof loading as a means of quality control in lumber manufacturing
The determination of the strength distribution of a given structural grade of lumber from any chosen mill is of growing concern to the lumber industry. Lumber in the lower range of strength values is of prime interest. A reverse proof loading procedure, applied in bending, appears to result in a …
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Modelling and optimization of Safety Instrumented Systems based on dependability and cost measures
… on modelling and multi-objective optimization of Safety Instrumented Systems (SIS) in compliance with the standard IEC 61508. SIS are in charge of monitoring that the operating conditions of a plant remain under safe limits and free of hazards. Their performance is, therefore, critical for the …
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A Method for the Combination of Stochastic Time Varying Load Effects
The problem of computing the probability of failure of a structure under the combined action of a number of time varying load processes is studied. Loads arrive at points in a Poisson process and are modeled by deterministic shapes for static effects and by continuous random processes for dynamic …
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Analytical and experimental comparison of deterministic and probabilistic optimization
… should lead to designs that make better use of the resources than designs obtained with the classical deterministic approach by distributing safety onto the different components and/or failure modes of a system in an optimal manner. However, probabilistic models rely on a number of …
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Reliability Analysis of Redundant Ductile Structural Systems
… invariably contains uncertainty, the safety of a structure may be measured realistically in terms of the probability of failure. The purpose of this study is to develop a practical method for determining the point estimate of the collapse probability of ductile structural systems, …
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Time and probablity of failure of timber framed walls in fire
The general aim of the research for this thesis was to develop models to predict the performance of fire resistant light-timber framed walls, in relation to requirements of new performance-based building fire regulations being introduced around the world. The performance bases that were adopted in …
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Modelling the effects of soil variability and vegetation on the stability of natural slopes.
… the inherent soil variability and the effect of vegetation, in particular the effect of tree root reinforcement, have a significant effect on the stability of a natural slope. However, in practice, these factors are not commonly considered in routine slope stability analysis. This is due …
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Development of an approach to incorporate proportional hazard modelling into a risk-based inspection methodology for an optimal inspection policy
The health and safety of pressure vessels are a concern in the power, chemical, petrochemical, and other industries handling gases or liquids at high temperatures. The content of a pressure vessel usually is at a substantially different pressure than the ambient pressure, and if not handled …
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Probabilistic service life prediction of composite viscoelastic cylindrical structure under random outdoor environment
… for probabilistic service life prediction of a composite viscoelastic cylindrical structure under random outdoor environment. The analysis emphasized both the statistical variations of environmental thermal loads and of material properties. The daily probability of failure was calculated …
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A failure prediction model for window glass
… practice for an analytical method to predict the probability of failure of window glass plates subjected to lateral loads. The failure prediction technique should include provision for all significant factors which influence glass strength and all significant factors which influence plate behavior …
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Finite element-based failure analysis of composite laminates with non-destructive feature quantification.
… mainstream material in the manufacturing process of industries from almost every sector - automotive, aerospace, energy, medical, sports and entertainment. While they are often preferred because of their superior material properties over traditional materials, their complex structural composition …
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Reliability Analysis of Braced Excavations
A method has been developed for evaluating the probability of failure of braced excavations through three critical modes of failure, namely buckling of struts, heaving of the base, and excessive settlement of the adjoining ground. The method was applied to braced excavations in medium to soft clays …
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