Evaluation of the Uncertainties Related to the Geotechnical Design Method and Its Consideration in Reliability Based Design

Geo-Risk 2017 ◽  
2017 ◽  
Author(s):  
Kerstin Lesny ◽  
Sami Akbas ◽  
Witold Bogusz ◽  
Sébastien Burlon ◽  
Giovanna Vessia ◽  
...  
Keyword(s):  
Design Method ◽  
Reliability Based Design ◽  
Geotechnical Design

scholarly journals Modified, Reliability-Based Robust Geotechnical Design Method, in Accordance with Eurocode 7

2021 ◽  
Vol 11 (18) ◽  
pp. 8423
Author(s):  
Filip Dodigović ◽  
Krešo Ivandić ◽  
Meho-Saša Kovačević ◽  
Božo Soldo
Keyword(s):  
Reliability Index ◽  
Design Method ◽  
System Response ◽  
Reliability Based Design ◽  
Eurocode 7 ◽  
Robustness Measure ◽  
Response Variance ◽  
Feasibility Robustness ◽  
Geotechnical Design ◽  
User Friendly

In this paper a modification of the reliability-based robust geotechnical design (RGD) method is proposed. The intention of the proposed modifications is to simplify the method, make it less computationally expensive, and harmonise of the results with Eurocode 7. The complexity of the RGD method mainly stems from the calculation of the design’s robustness measure, which is the feasibility robustness index (ββ). Due to this fact, the replacing of the existing robustness measure with a generalised reliability index (β) is considered. It was demonstrated that β fits into the robustness concept, and is traditionally used as a construction reliability measure, making it intuitive and “user friendly”. It is proposed to conduct a sensitivity analysis using Soboli indices, with the aim of freezing the variables whose contribution to the system response variance is negligible, which will further simplify the method. By changing the robustness measure, the number of the required reliability analyses is significantly decreased. Further reduction is achieved by conducting analyses only for the designs chosen in the scope of the genetic algorithm. The original RGD method is used as an extension of traditional reliability-based design. By applying the proposed modifications, the RGD method can be used as an alternative to the classic and reliability-based design method.

Strength Model Uncertainties of Burst, Yielding, and Excessive Bending of Piping

2009 ◽  
Vol 131 (3) ◽  
Author(s):  
Kleio Avrithi ◽  
Bilal M. Ayyub
Keyword(s):  
Structural Design ◽  
Design Method ◽  
Strength Model ◽  
Allowable Stress ◽  
Model Uncertainties ◽  
Reliability Based Design ◽  
Design Variables ◽  
Strength Models ◽  
Potential Use ◽  
Allowable Stress Design

Nuclear safety-piping is designed according to the ASME Boiler and Pressure Vessel Code, Sections III, NB-, NC-, and ND-3600 that use the allowable stress design method (ASD). The potential use instead of reliability-based design equations for nuclear piping could benefit the structural design by providing, among others, consistent reliability levels for piping. For the development of such equations, not only the probabilistic characteristics of the design variables are needed, but also the quantification of the uncertainties introduced by the strength models that are used in order to estimate the resistance of pipes subjected to different loadings. This paper evaluates strength models, and therefore provides necessary information for the reliability-based design of pipes for burst or yielding due to internal pressure and for excessive bending.

A Robust and Efficient Method of Designing Piles for Landslide Stabilization

2020 ◽  
Vol 26 (4) ◽  
pp. 481-492
Author(s):  
Yang Yu ◽  
Xingmin Li ◽  
Xiaohua Pan ◽  
Qing Lü
Keyword(s):  
Efficient Method ◽  
Large Scale ◽  
Polynomial Function ◽  
Design Method ◽  
Quadratic Polynomial ◽  
Soil Parameters ◽  
Stabilizing Piles ◽  
Geotechnical Design ◽  
The Mean ◽  
Landslide Stabilization

ABSTRACT Stabilizing pile is a widely used method to reduce the development of large-scale landslides. Optimizing the pile geometry is a great challenge in the design of stabilizing piles with the purpose of cost-effectiveness, especially for soil strength parameters with large uncertainty. The objective of this study is to propose a robust and efficient method of designing piles for landslide stabilization with the consideration of the safety of slope, uncertainty of soil parameters, and cost of stabilizing piles. A new response surface, which incorporates soil parameters and stabilizing force into a quadratic polynomial function, is first proposed. Unknown coefficients of the quadratic polynomial function are solved with a numerical method at typical sampling points. Based on the solved quadratic polynomial function, the mean and standard deviation of factor of safety (FOS) of the pile-stabilized slope as well as the signal-to-noise factor are then calculated in order to evaluate the design robustness. A framework based on the concept of robust geotechnical design is presented, and its feasibility is illustrated by two cases of soil slopes. The results indicate that the proposed robust geotechnical design method could be used to optimize the design of landslide-stabilizing piles.

scholarly journals Proposal of a Reliability-Based Design Method for Static and Fatigue Strength of MEMS Micromirror

2006 ◽  
Vol 55 (3) ◽  
pp. 290-294 ◽  
Author(s):  
Satoshi IZUMI ◽  
Masayuki KADOWAKI ◽  
Shinsuke SAKAI ◽  
Yuzuru UEDA ◽  
Atsushi SUZUKI
Keyword(s):  
Fatigue Strength ◽  
Design Method ◽  
Reliability Based Design

Application of High-Grade Steels to Onshore Natural Gas Pipelines Using Reliability-Based Design Method

2006 ◽  
Author(s):  
Joe Zhou ◽  
Brian Rothwell ◽  
Wenxing Zhou ◽  
Maher Nessim
Keyword(s):  
High Pressure ◽  
Wall Thickness ◽  
Design Method ◽  
Large Diameter ◽  
Economic Assessment ◽  
High Grade ◽  
Gas Pipelines ◽  
Natural Gas Pipelines ◽  
Reliability Based Design ◽  
Design Factors

Two example onshore gas pipelines were designed using a reliability-based approach. The first example (1219 mm, 17.2 MPa) represents a high-pressure large-diameter pipeline; the second example has a smaller diameter (762 mm) and lower pressure (9.9 MPa). Three steel grades (X70, X80 and X100) were used to develop three design solutions for each example. The wall thickness-related life cycle costs of the designs were evaluated. The design outcomes show that the reliability targets for both examples can be met using X100 steels and high equivalent design factors (0.93 for the first example and 0.9 for the second example). Moreover, ruptures and excessive plastic deformation of a defect free pipe were found to be insignificant integrity threats even when the design uses X100 and relatively high equivalent design factors such as 0.85 and 0.9. The economic assessment results show that the X100 design is the most economical option for the high-pressure large-diameter example. However, using X100 does not show a clear economic advantage over using X80 for the second example mainly because the wall thickness for the design using X100 is governed by the maximum D/t ratio constraint. The study also demonstrates the advantages of the reliability-based approach as a valuable tool in assessing the feasibility and potential benefits of using high-grade steels on a pipeline project.

scholarly journals On Some Methods in Safety Evaluation in Geotechnics

2015 ◽  
Vol 37 (2) ◽  
pp. 17-32 ◽  
Author(s):  
Wojciech Puła ◽  
Łukasz Zaskórski
Keyword(s):  
Design Method ◽  
Safety Evaluation ◽  
Short Review ◽  
Cohesionless Soils ◽  
Reliability Based Design ◽  
Working Stress ◽  
Rigid Pile ◽  
Complementary Role ◽  
Capacity Calculation ◽  
Reliability Methods

Abstract The paper demonstrates how the reliability methods can be utilised in order to evaluate safety in geotechnics. Special attention is paid to the so-called reliability based design that can play a useful and complementary role to Eurocode 7. In the first part, a brief review of first- and second-order reliability methods is given. Next, two examples of reliability-based design are demonstrated. The first one is focussed on bearing capacity calculation and is dedicated to comparison with EC7 requirements. The second one analyses a rigid pile subjected to lateral load and is oriented towards working stress design method. In the second part, applications of random field to safety evaluations in geotechnics are addressed. After a short review of the theory a Random Finite Element algorithm to reliability based design of shallow strip foundation is given. Finally, two illustrative examples for cohesive and cohesionless soils are demonstrated.

Reliability-based design of truck escape ramps

2020 ◽  
Vol 47 (4) ◽  
pp. 395-404
Author(s):  
Kaitlyn Greto ◽  
Said M. Easa
Keyword(s):  
United States ◽  
Design Method ◽  
Rolling Resistance ◽  
The United States ◽  
Probability Of Failure ◽  
First Order ◽  
Reliability Based Design ◽  
First Order Second Moment ◽  
Design Speed ◽  
Design Scenario

The design method of truck escape ramps (TERs) presented by the Transportation Association of Canada and other organizations is deterministic and assumes fixed values of the design speed, rolling resistance, and ramp grade. This paper presents a reliability-based method for TER design based on the first-order second-moment (FOSM) method and the advanced FOSM (AFOSM) method. These methods rely on the distribution of the component random variables. Each method was used to analyze a TER with one grade and two grades. The FOSM is simple and can be easily used by practitioners, even with calculators. The AFOSM is more complicated but more accurate as it considers the design points in determining the probability of failure. The AFOSM method was used to establish design graphs for the required length of TERs. Application of the proposed method is illustrated using actual TERs in the United States and considering a hypothetical design scenario.

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