Design of shallow foundations under tensile loading for transmission line towers: An overview

Pacheco, Marcus; Danziger, Fernando Artur Brasil; Pinto, Carlos Alberto Schettini

doi:10.1016/j.enggeo.2008.06.002

Cited by 32 publications

(11 citation statements)

References 47 publications

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“…During the operation of transmission line tower foundation, due to wind and other factors, the foundation often bears the combined loads, including up-pull, down-compress, and lateral-push [20]. e uplift load has been proved to be the key design load of tower foundation [21].…”

Section: Foundation Installation Processmentioning

confidence: 99%

Estimating the Uplift Bearing Capacity of Belled Piers Adjacent to Sloping Ground by Numerical Modeling Based on Field Tests

Yangchun

Cheng

Zheng

et al. 2020

Advances in Civil Engineering

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In order to evaluate the uplift bearing capacity of belled piers beside slopes, a series of numerical simulations are carried out based on field tests data. First, a number of uplift loading tests of full-scale belled piers are carried out on the project site of transmission line in Anhui Province, China. Second, a slope-foundation model for numerical modeling is proposed and calibrated based on field tests data. The behavior of belled piers adjacent to slopes subject to uplift load is studied by numerical modeling. The impact of three parameters, including distance (a) from the belled pier to the crest of the slope, slope angle (β), and embedment depth (h) of the belled pier, has been investigated on the uplift capacity of the belled pier. Based on the simulation results, an attenuation coefficient (ω) is put forward for evaluating the reduction of uplift bearing capacity of the belled pier. The results show that the coefficient ω is negatively correlated with distance a and depth h, and the influence of distance a is greater than that of depth h according to the results of variance analysis, but the difference is not significant by F test. Moreover, the empirical equation between attenuation coefficient ω and three key factors a, β, and h had been presented by a series of fitting.

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Section: Foundation Installation Processmentioning

confidence: 99%

Estimating the Uplift Bearing Capacity of Belled Piers Adjacent to Sloping Ground by Numerical Modeling Based on Field Tests

Yangchun

Cheng

Zheng

et al. 2020

Advances in Civil Engineering

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“…Two main failure modes can be identified in uplift (Kulhawy et al 2003;Pacheco et al 2008), one for shallow, and one for deep spread foundations. For the former, most commonly used, a vertical shear pattern or cone/wedge failure along inclined planes can occur; for the latter, a type of punch-through failure might take place above the foundation.…”

Section: Failure Mechanism For Spread Foundation In Upliftmentioning

confidence: 99%

“…− the curved surface methods -in which the resistance is provided by the weight of the soil in the curved zone; according to Pacheco et al (2008), the actual failure obtained from tensile tests in stiff soils is often curvilinear. ; however, it may be replaced by an equivalent simplified conical surface;…”

Section: Failure Mechanism For Spread Foundation In Upliftmentioning

confidence: 99%

“…1). In some cases, like terminal or heavy angle towers, where direction of the transmission line is changed at the specific tower, it may result in uplift as a normal long-term or frequently occurring condition (Eskom 2005;Pacheco et al 2008). To provide resistance to uplift, spread foundations are often preferred to pile foundations as their design is relatively simpler; furthermore, their construction does not require specialised drilling rigs and deep geotechnical investigation.…”

Section: Introductionmentioning

confidence: 99%

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Ultimate Limit State Design of Spread Foundations in The Case of Uplift

Bogusz

2016

Proceedings of 13th Baltic Sea Geotechnical Conference

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As vast majority of spread foundations are never subjected to vertical uplift loads, the subject of uplift capacity in such cases is barely covered by current European standards. Although the limit state design due to uplift is a subject of a section 10 of Eurocode 7, it mainly covers the possibility of a hydraulic failure while taking into the account any destabilizing variable actions. However, in the case of separate foundations of lattice towers used as support structures for overhead power lines, the uplift capacity of spread foundations often governs the design. The rules for the design of these structures are included in the informative annex M of EN 50341-1: 2012 Overhead electrical lines exceeding AC 1 kV – Part 1: General requirements – Common specifications. Rules presented in this standard differ significantly from those presented in Eurocode 7. The purpose of this paper is to present the design approaches for the limit state design of spread foundations subjected to uplift, while the differences between design rules and resulting variation of reliability are the primary concerns.

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“…Thus, the construction of foundations in Aeolian sand for transmission towers is inevitable. Transmission line towers experience a mode of foundation loading that is unique among engineering structures, the design load is given by the superposition of the tension vertical loads combined with mutually perpendicular horizontal loads acting transversely and along the transmission line (Pacheco et al 2008). In Aeolian sand, the cast-in-place concrete spread foundations have been widely used in transmission line engineering to resist a combination of uplift and lateral loadings.…”

Section: Introductionmentioning

confidence: 99%

Spread Foundation Behaviors in Reinforced Aeolian Sand under a Combination of Uplift and Lateral Loadings

Qian

2014

Tunneling and Underground Construction

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This study elucidated the field tests on behaviors of the spread foundations with centrically vertical pier, vertical but offset pier, and battered pier in geogrid-plannar-reinforced Aeolian sand under a combination of uplift and lateral loadings, which was compared with the parallel studies of the same foundations in Aeolian sand. The site conditions, the arrangement of reinforcing geogrid, and the load tests were documented comprehensively. A dimensionless breakout factor was presented to reflect the difference of foundation types. Under a combination of uplift and lateral loadings, the uplift-displacement curve exhibited a two-phase behavior, while the corresponding lateral displacement gradually increased with the load without two-phase behavior apparently. Under a combination of uplift and lateral loadings, the foundation type had an obvious effect on the load-displacement behaviors. The spread foundations with vertical but offset pier or battered pier could have a better load bearing capacity than that of the foundations with centrically vertical pier. Due to the higher tensile capacity of the geogrid and the frictional resistance between the geogrid and the sand mass, the geogird reinforced Aeolian sand could behave as a much stiffer system to improve the uplift and lateral bearing capacity of the spread foundations.

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Design of shallow foundations under tensile loading for transmission line towers: An overview

Cited by 32 publications

References 47 publications

Estimating the Uplift Bearing Capacity of Belled Piers Adjacent to Sloping Ground by Numerical Modeling Based on Field Tests

Estimating the Uplift Bearing Capacity of Belled Piers Adjacent to Sloping Ground by Numerical Modeling Based on Field Tests

Ultimate Limit State Design of Spread Foundations in The Case of Uplift

Spread Foundation Behaviors in Reinforced Aeolian Sand under a Combination of Uplift and Lateral Loadings

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