Performance-Based Design of Deep Foundation Systems in Load and Resistance Factor Design Framework

Roberts, Lance A.; Misra, Anil

doi:10.3141/2186-04

Cited by 9 publications

(2 citation statements)

References 12 publications

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“…The advantage of using PBD is that the ambiguity of the so-called lateral "capacity" or "nominal lateral resistance" can be removed. It was noted that the mere definition of capacity can be a misnomer (Roberts & Misra 2010). In the PBD methodologies, a foundation design would be safe and serve its intended functions satisfactorily as long as the specified performance criteria are satisfied for the prescribed load effects.…”

Section: Performance-based Designmentioning

confidence: 98%

Reliability-Based Design of Laterally Loaded Piles Considering Soil Spatial Variability

Fan

Liang

2013

Foundation Engineering in the Face of Uncertainty

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The p-y method has been commonly used for analysis of laterally loaded piles. Recently, a sampling-based approach for reliability analysis of laterally loaded piles has been developed by the authors. With the performance criteria defined for the laterally loaded piles, the probability of non-satisfactory performance can be conveniently computed. However, at any project site, soil properties used as input in the computation, such as strength parameters and stiffness values, generally exhibit spatial variations. There is a need to take into account of this spatial variation in the reliability analysis. In this paper, the Monte Carlo simulation technique developed for reliability analysis of laterally loaded piles is briefly described first. Next, a statistical tool for taking into consideration of spatial variability of pertinent soil properties in the developed reliability analysis is presented. A design example is given to illustrate the influences of spatial variability of soil properties on the computed outcome. Specifically, the correlation length of the soil properties at the site can exert significant influences on the computed results. It is recommended that spatial correlation of soil properties should be considered in order to accurately perform reliability analysis and design of piles under lateral loads.

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Section: Performance-based Designmentioning

confidence: 98%

Reliability-Based Design of Laterally Loaded Piles Considering Soil Spatial Variability

Fan

Liang

2013

Foundation Engineering in the Face of Uncertainty

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“…In the traditional design methodologies, the strength limit state or the ultimate limit state is checked to assure the summation of the load effects does not exceed the summation of the resistance. However, the interpretation of nominal resistance can be problematic because of various criteria being suggested for interpreting nominal resistance from the load test obtained load settlement curve . The use of PBD approach can remove the ambiguity in interpreting nominal resistance from the load–settlement curve obtained from actual load tests.…”

Section: Performance‐based Design and Measure Of System Safetymentioning

confidence: 99%

Reliability‐based design of axially loaded drilled shafts using Monte Carlo method

Fan

Liang

2012

Num Anal Meth Geomechanics

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This paper presents a performance-based reliability design methodology for axially loaded drilled shaft foundations using the Monte Carlo statistical methods. The performance criteria for an axially loaded drilled shaft are defined in terms of the drilled shaft head displacement. The load transfer method is used as the computational model for solving the nonlinear soil-foundation interaction problem and to predict the load-settlement curve at the drilled shaft head. The input to the computational model and the model error are treated as random variables. Particularly, soil properties such as soil strength parameters are modeled as random fields to account for soil spatial variability. Random field samples are generated using local averaging subdivision according to the prescribed statistical descriptors, including mean, variance, and correlation length. Given performance-based acceptance criteria, the probability of failure can be evaluated for the prescribed load effects. A computer program is developed to facilitate the computation of the load-displacement curves of the drilled shaft head by using the commonly adopted load transfer concepts (t-z curves and q-w curves for shaft side and toe, respectively). Two design examples are presented, one for uplift and the other for compression, to illustrate the application of the developed performance-based reliability design methodology. One of the important observations from the examples is that the computed probability of failure can be sensitive to the spatial variations of soil strengths characterized by the correlation structures. It is strongly recommended that spatial variation of soil properties be considered in the reliability-based foundation design.

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Reliability-based code revision for design of pile foundations: Practice in Shanghai, China

Zhang

Liu

et al. 2015

Soils and Foundations

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Conditions d'exposition professionnelle des secrétaires d'une entreprise du secteur privé aux douleurs du rachis et des membres supérieurs à Abidjan, Côte d'Ivoire Pain of the spine and upper limbs related to occupational exposure conditions of secretaries in a private sector company in Abidjan, Ivory CoastObjective. To contribute to the improvement of secretaries working conditions. Materials and methods. The study was cross-sectional and descriptive of the working conditions of the service secretaries for at least 1 year of a private sector company in Abidjan. A questionnaire was administered to the secretaries present during the investigation. They were also observed in the workplace. Results. The study included 48 female secretaries, with an average age of 45 AE 8.08 years, mostly overweight or obese (66.7%); 56.25% of the secretaries had more than 10 years of the post; 93.7% of them did not have ergonomic seat. Pain was the main symptom (79.2%). The cervical spine (60.4%) and the thoracolumbar spine (58.3%) were more affected than the shoulders (39.6%). Among the surveyed secretaries, 87.3% (42/48) had not received any training in working gestures or postures. There was a predominance of lesions involving the secretaries following factors: overweight or obesity (90.6%), the position of seniority over 10 years (56.2%), poor working posture (89.7%) and use of non-ergonomic seat (93.7%). Conclusion. Secretaries working conditions are binding. They can be improved by processing workstations, training for secretaries to work postures and gestures, the respect of labor standards on visual display terminal and the appropriate health surveillance. ß

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Performance-Based Design of Deep Foundation Systems in Load and Resistance Factor Design Framework

Cited by 9 publications

References 12 publications

Reliability-Based Design of Laterally Loaded Piles Considering Soil Spatial Variability

Reliability-Based Design of Laterally Loaded Piles Considering Soil Spatial Variability

Reliability‐based design of axially loaded drilled shafts using Monte Carlo method

Reliability-based code revision for design of pile foundations: Practice in Shanghai, China

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