Factor of Safety and Reliability in Geotechnical Engineering

Cherubini, Claudia; Christian, John T.; Baecher, Gregory B.; Failmezger, Roger A.; Focht, John A.; Koutsoftas, Demetrious C.; Ladd, Charles C.; Re, Gregory Da; Li, K. S.; Lam, Joley; Moriwaki, Yoshi; Barneich, John A.; Schmertmann, John H.; Duncan, James M.

doi:10.1061/(asce)1090-0241(2001)127:8(700)

Cited by 31 publications

(4 citation statements)

References 25 publications

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“…where r a 2 is equal to y 2 + z 2 and σ is the axial stress. Considering the shear failure probability, the axial stress on the residual bearing interface is (Duncan, 2000):…”

Section: Principles Of the Jc Methodsmentioning

confidence: 99%

“…The cohesion and the internal friction angle of the soil, significantly affecting the reliability, are frequently random. The composition and the grain size of the soil, the environmental conditions, the stress conditions, the experimental methods, etc., are responsible for the randomness (Duncan, 2000). Practically, the internal friction angle and the cohesion are independently analyzed because the ignorance of the self-correlation can facilitate the calculation.…”

Section: Creep Characteristics and Time-dependent Reliabilitymentioning

confidence: 99%

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The Creep Model of the Anchorage Structure and the Time-Dependent Reliability Analysis

2020

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The anchorage structure is a complex bearing system with undetermined failure modes. According to component characteristics, the segmented diagram for the bearing characteristics and the bearing structure at the anchorage segment were established. In addition, we described the failure patterns of the subsystems of the anchorage structure and further established the series model for the reinforced system by bolts. Moreover, according to the total displacement and the time-dependent deformation characteristics of the bolt, a non-linear creep model to analyze the viscoplastic deformation characteristics of the M-C element was established. Furthermore, considering the shear strength of the anchored soil, it was assumed that the cohesion and the internal friction angle were random variables following the Weibull distribution. Using the modified first-order second-moment method (the JC method), the analytic expression of the time-dependent index of the anchorage system was obtained. An example showed that the variable coefficients of the cohesion and the internal friction angle were exponentially and linearly related to the reliability index, respectively. Simultaneously, the reliability index was exponentially related to time.

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“…where r a 2 is equal to y 2 + z 2 and σ is the axial stress. Considering the shear failure probability, the axial stress on the residual bearing interface is (Duncan, 2000):…”

Section: Principles Of the Jc Methodsmentioning

confidence: 99%

Section: Creep Characteristics and Time-dependent Reliabilitymentioning

confidence: 99%

The Creep Model of the Anchorage Structure and the Time-Dependent Reliability Analysis

2020

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“…Average reference values of these properties mat be found, for example, in reference [67], namely, E=250 MPa, ν = 0.2 and ρ = 1900 kg/m 3 . The authors of references [68][69][70] propose the use of log-normal distributions for these three properties, with coefficients of variation of 0.30 for E and 0.05 for ν and ρ.…”

Section: Soil Propertiesmentioning

confidence: 99%

Parametric analysis of railway infrastructure for improved performance and lower life-cycle costs using machine learning techniques

Sainz-Aja

Ferreño²,

Pombo³

et al. 2023

Advances in Engineering Software

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“…In an effort to eradicate such gross oversimplifications, probabilistic techniques have come to the fore for geotechnical applications [30][31][32][33][34]. Such approaches utilise all of the available data from a soil layer in the form of a probability distribution.…”

Section: Stochastic Ground Modelmentioning

confidence: 99%

Probabilistic examination of the change in eigenfrequencies of an offshore wind turbine under progressive scour incorporating soil spatial variability

2018

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The trend for development in the offshore wind sector is towards larger turbines in deeper water. This results in higher wind and wave loads on these dynamically sensitive structures. Monopiles are the preferred foundation solution for offshore wind structures and have a typical expected design life of 20 years. These foundations have strict serviceability tolerances (e.g. mudline rotation of less than 0.25 during operation). Accurate determination of the system frequency is critical in order to ensure satisfactory performance over the design life, yet determination of the system stiffness and in particular the operational soil stiffness remains a significant challenge. Offshore site investigations typically focus on the determination of the soil conditions using Cone Penetration Test (CPT) data. This test gives large volumes of high quality data on the soil conditions at the test location, which can be correlated to soil strength and stiffness parameters and used directly in pile capacity models. However, a combination of factors including; parameter transformation, natural variability, the relatively small volume of the overall sea bed tested and operational effects such as the potential for scour development during turbine operation lead to large uncertainties in the soil stiffness values used in design. In this paper, the effects of scour erosion around unprotected foundations on the design system frequencies of an offshore wind turbine is investigated numerically. To account for the uncertainty in soil-structure interaction stiffness for a given offshore site, a stochastic ground model is developed using the data resulting from CPTs as inputs. Results indicate that the greater the depth of scour, the less certain a frequency-based SHM technique would be in accurately assessing scour magnitude based solely on first natural frequency measurements. However, using Receiver Operating Characteristic (ROC) curve analysis, the chance of detecting the presence of scour from the output frequencies is improved significantly and even modest scour depths of 0.25 pile diameters can be detected.

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Factor of Safety and Reliability in Geotechnical Engineering

Cited by 31 publications

References 25 publications

The Creep Model of the Anchorage Structure and the Time-Dependent Reliability Analysis

The Creep Model of the Anchorage Structure and the Time-Dependent Reliability Analysis

Parametric analysis of railway infrastructure for improved performance and lower life-cycle costs using machine learning techniques

Probabilistic examination of the change in eigenfrequencies of an offshore wind turbine under progressive scour incorporating soil spatial variability

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