Research on Failure Criterion of Lattice Jib Structural System Reliability

2014 ◽  
Vol 551 ◽  
pp. 194-201
Author(s):  
Ge Ning Xu ◽  
Shuai Lei He ◽  
Rui Gang Yang
Keyword(s):  
Failure Mode ◽  
Failure Criterion ◽  
System Reliability ◽  
Mechanical Characteristics ◽  
Failure Modes ◽  
Structural System ◽  
Structure System ◽  
Structural System Reliability ◽  
Overall Stability ◽  
Jib Structure

In Four-column limb lattice jib structure system as the research object, considering the structure and mechanical characteristics, combining with the allowable stress method, from the failure mode of static strength, stiffness, overall stability and local stability to build lattice jib structure system reliability failure criterion. Based on the influence of parameter perturbation calculation of four-column limb lattice jib structure system, get the length of the jib, lifting weight, jib elevation, hoisting load bearing point offset, the proportion of wind environment on the influence of different failure modes and failure change law, as the main failure mode of the decision to provide the basis and methods.

scholarly journals Study on the Stability of the Coal Seam Floor above a Confined Aquifer Using the Structural System Reliability Method

Geofluids ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-15 ◽  
Author(s):  
Haifeng Lu ◽  
Xiuyu Liang ◽  
Nan Shan ◽  
You-Kuan Zhang
Keyword(s):  
Coal Seam ◽  
System Reliability ◽  
Failure Modes ◽  
Water Inrush ◽  
Series System ◽  
Mechanical Parameters ◽  
Structural System ◽  
Key Strata ◽  
Structural System Reliability ◽  
The Stability

A quantitative method of structural system reliability was proposed to study the influence of random rock mechanical parameters and loads on the stability of the coal seam floor above confined aquifers. To obtain the reliability probability of the floor, two modes of water-resistant floor failure were suggested as follows: (1) mining completely removed the water-resistant key strata of the floor. In this case, the failure modes were of three main types: mining failure, confined water intrusion, and combined mining failure and intrusion. (2) Failure modes included shear and tensile failures when the thickness of the key strata was greater than 0. On the basis of the elastic thin plate theory, the performance function that calculates the reliability probability of all modes could be obtained. The failure modes were regarded as the series system. The Monte Carlo method was employed to calculate the reliability probability of each failure mode and series system. The results showed that the random rock mechanical parameters and loads of the key strata significantly influence the antiwater inrush capacity of the floor. In addition, the water inrush coefficient and reliability probability can be simultaneously used as the evaluation indexes of water inrush risk. Both these indexes could improve the assessment of the reliability of the floor.

Reliability Analysis of Structure System Considering Failure Modes of Strength, Fatigue and Buckling

2008 ◽  
Vol 385-387 ◽  
pp. 257-260 ◽  
Author(s):  
Wei Guang An ◽  
Hai An ◽  
Yong Yi Zhang
Keyword(s):  
Failure Mode ◽  
Damage Mechanics ◽  
Failure Modes ◽  
Structural System ◽  
Structural Element ◽  
Structure System ◽  
Residual Structure ◽  
Calculating Method ◽  
Strength Failure ◽  
Buckling Failure

There could be multi-failure modes in the course of working of the structure system including slender bar members. For example, strength failure, fatigue failure and buckling failure, especially sudden buckling failure would bring large disaster to structure. In this paper, according to Fatigue and Damage Mechanics theory, safe margin expression of the different failure mode of structure (static strength, fatigue and buckling) is given firstly, then by analyzing different failure mode of structural element under static and fatigue loads, and failure mode of the calculating element is confirmed by comparing the failure probability value of different failure mode. In the course of searching for significant failure paths, not only is failure mode that stiffness matrix of structure is zero considered, but also buckling failure mode of compressed residual structure is considered too, so that failure analysis is more reasonable. In the end, the reliability calculating method of the structural system is given, and the validity of the method proposed in this paper is explained combining an example.

scholarly journals Time-Independent Reliability Analysis of Bridge System Based on Mixed Copula Models

2016 ◽  
Vol 2016 ◽  
pp. 1-13 ◽  
Author(s):  
Yuefei Liu ◽  
Xueping Fan
Keyword(s):  
Reliability Analysis ◽  
System Reliability ◽  
Failure Modes ◽  
Parallel Systems ◽  
Structural System ◽  
Copula Models ◽  
Structural System Reliability ◽  
Component Systems ◽  
Nonlinear Correlations ◽  
Series Systems

The actual structural systems have many failure modes. Due to the same random sources owned by the performance functions of these failure modes, there usually exist some nonlinear correlations between the various failure modes. How to handle the nonlinear correlations is one of the main scientific problems in the field of structural system reliability. In this paper, for the two-component systems and multiple-component systems with multiple failure modes, the mixed copula models for time-independent reliability analysis of series systems, parallel systems, series-parallel systems, and parallel-series systems are presented. These obtained mixed copula models, considering the nonlinear correlation between failure modes, are obtained with the chosen optimal copula functions with the Bayesian selection criteria and Monte Carlo Sampling (MCS) method. And a numerical example is provided to illustrate the feasibility and application of the built mixed models for structural system reliability.

Optimal Reliability and Cost of Non-Repairable Systems Subject to Two Failure Modes Considering Correlated Failures

2018 ◽  
Vol 25 (05) ◽  
pp. 1850024
Author(s):  
Anusha Krishna Murthy ◽  
Saikath Bhattacharya ◽  
Lance Fiondella
Keyword(s):  
Failure Mode ◽  
System Reliability ◽  
Failure Modes ◽  
Optimal Number ◽  
Optimal Designs ◽  
Repairable Systems ◽  
Independent Manner ◽  
Reliability Models ◽  
Correlated Failures ◽  
The Impact

Most reliability models assume that components and systems experience one failure mode. Several systems such as hardware, however, are prone to more than one mode of failure. Past two-failure mode research derives equations to maximize reliability or minimize cost by identifying the optimal number of components. However, many if not all of these equations are derived from models that make the simplifying assumption that components fail in a statistically independent manner. In this paper, models to assess the impact of correlation on two-failure mode system reliability and cost are developed and corresponding expressions for reliability and cost optimal designs derived. Our illustrations demonstrate that, despite correlation, the approach identifies reliability and cost optimal designs.

On the bounds for structural system reliability

1991 ◽  
Vol 9 (4) ◽  
pp. 247-259 ◽  
Author(s):  
Weicheng Cui ◽  
David I. Blockley
Keyword(s):  
System Reliability ◽  
Structural System ◽  
Structural System Reliability
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