Reliability-based design of deep foundations based on differential settlement criterion

Roberts, Lance A.; Misra, Anil

doi:10.1139/t08-117

Cited by 16 publications

(6 citation statements)

References 12 publications

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“…Although, it is important to consider the total settlement of a footings on cohesive soils in a design of a RC structures. However, construction costs to repair the disturbances caused by differential settlement can be quite substantial and productivity losses to an owner may occur if the structure must be taken out of service [49]. The differential settlement between two adjacent foundations is often a parameter of interest.…”

Section: Differential Settlementmentioning

confidence: 99%

Effect of Long-Term Soil Deformations on RC Structures Including Soil-Structure Interaction

Bezih¹,

Chateauneuf²,

Demagh³

2020

Civ Eng J

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Lifetime service of Reinforced Concrete (RC) structures is of major interest. It depends on the action of the superstructure and the response of soil contact at the same time. Therefore, it is necessary to consider the soil-structure interaction in the safety analysis of the RC structures to ensure reliable and economical design. In this paper, a finite element model of soil-structure interaction is developed. This model addresses the effect of long-term soil deformations on the structural safety of RC structures. It is also applied to real RC structures where soil-structure interaction is considered in the function of time. The modeling of the mechanical analysis of the soil-structure system is implemented as a one-dimensional model of a spring element to simulate a real case of RC continuous beams. The finite element method is used in this model to address the nonlinear time behavior of the soil and to calculate the consolidation settlement at the support-sections and the bending moment of RC structures girders. Numerical simulation tests with different loading services were performed on three types of soft soils with several compressibility parameters. This is done for homogeneous and heterogeneous soils. The finite element model of soil-structure interaction provides a practical approach to show and to quantify; (1) the importance of the variability of the compressibility parameters, and (2) the heterogeneity soil behavior in the safety RC structures assessment. It also shows a significant impact of soil-structure interaction, especially with nonlinear soil behavior versus the time on the design rules of redundant RC structures. Doi: 10.28991/cej-2020-03091618 Full Text: PDF

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Section: Differential Settlementmentioning

confidence: 99%

Effect of Long-Term Soil Deformations on RC Structures Including Soil-Structure Interaction

Bezih¹,

Chateauneuf²,

Demagh³

2020

Civ Eng J

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“…The spacing between footings and COV of SPT-N values were found to be the key parameters to assess the differential settlement of footings on cohesionless soils. Roberts and Misra (2009) performed a reliability-based analysis to estimate the differential settlement of footings using a load-displacement model. Initial shear modulus of the soil-footing interface was assumed as a random variable.…”

Section: Differential Settlement Of Shallow Foundationsmentioning

confidence: 99%

“…Numerous amount of experimental, analytical, and numerical modeling research have been conducted on the behavior of shallow foundations over the years, though most of them included deterministic analysis. In recent years, bearing capacity and settlement of shallow foundations have been analyzed probabilistically by many researchers with spatial variability of soil properties (Wu and Kraft, 1967;Resendiz and Herrera, 1969;Folayan et al, 1970;Beacher and Ingra, 1981;Zeitoun and Baker, 1992;Nadim et al, 1993;Paice et al, 1994Paice et al, , 1996Brzakala and Pula, 1996;Cherubini, 2000;Griffiths et al, 2002aGriffiths et al, , 2002bGriffiths et al, , 2006Fenton and Griffiths, 2002, 2005Kuo et al, 2004;Sivakugan and Johnson, 2004;Popescu et al, 2005aPopescu et al, , 2005bAkbas, 2007;Fenton et al, 2008;Srivastava and Babu, 2009;Griffiths and Fenton, 2009;Akbas and Kulhawy, 2009;Roberts and Misra, 2009;Jimenez and Sitar, 2009). Reliability-based design (RBD) methods have also been developed for foundation engineering problems such as bearing capacity, settlement, and uplift by many researchers (Cherubini, 2000;Fenton et al, 2007Fenton et al, , 2008Akbas and Kulhawy, 2009;Roberts and Misra, 2009).…”

Section: Introductionmentioning

confidence: 99%

Application of probabilistic methods to characterize soil variability and their effects on bearing capacity and settlement of shallow foundations: state of the art

Kayser

Gajan

2014

International Journal of Geotechnical Engineering

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This paper presents the applications of probabilistic methods to analyze the load-displacement behavior of shallow foundations supported by uncertain and spatially variable soils. The paper describes the types and sources of uncertainties in soil properties that dictate the bearing capacity and settlement of shallow foundations and characterizes their probabilistic distributions. General probabilistic analysis methods that are commonly used in foundation engineering applications such as first order second moment (FOSM) method, tornado diagram method, Monte Carlo (MC) simulation method, random finite element method (RFEM), and reliability-based design (RBD) method are briefly described. A thorough summary of the applications of these methods in determining the probabilistic bearing capacity, settlement, and differential settlement of shallow foundations from the research literature is presented.

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“…Zeitoun and Baker (1992) examined differential settlements between pairs of foundations in the problem of two beams acting on three supports. Roberts and Misra (2009) developed a reliability-based design approach for deep foundations which considered differential settlement D r a f t between a pair of deep foundations. More recently, Ahmed and Soubra (2013) predicted the probability of exceeding a tolerable differential settlement between two strip footings resting on a 2-D spatially variable elastic soil and found a worst-case correlation length.…”

Section: Introductionmentioning

confidence: 99%

Design of foundations against differential settlement

Naghibi

Fenton

2022

Can. Geotech. J.

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The serviceability limit state (SLS) design of foundations typically proceeds by limiting the total settlement of individual foundations and thereby attempting to restrict the differential settlement between pairs of foundations. Due to the uncertain nature of the supporting ground, the magnitude of settlement and differential settlement are random. As it is often the differential settlement which governs serviceability, it is desirable to provide design requirements which suitably restrict differential settlements. This paper investigates, by Monte Carlo simulation, the distribution of the maximum differential settlement between pairs of foundations as a function of the spacing between foundations and the number of foundations – groups of 4, 9, or 16 foundations, arranged on a grid, are considered. The effects of the correlations between the equivalent stiffness of the ground under each foundation, as well as between the loads applied to the foundations, on the distribution of the maximum differential settlements and angular distortions are investigated. Ratios of resistance factor to resistance bias factor are presented that can be used to calibrate design requirements on the total settlement of individual foundations which also simultaneously achieve acceptable performance with respect to angular distortion.

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Reliability-based design of deep foundations based on differential settlement criterion

Cited by 16 publications

References 12 publications

Effect of Long-Term Soil Deformations on RC Structures Including Soil-Structure Interaction

Effect of Long-Term Soil Deformations on RC Structures Including Soil-Structure Interaction

Application of probabilistic methods to characterize soil variability and their effects on bearing capacity and settlement of shallow foundations: state of the art

Design of foundations against differential settlement

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