Influence of grille spacing on the uplift behaviour of steel grillages for OHLs

TY - GEN

T1 - Influence of grille spacing on the uplift behaviour of steel grillages for OHLs

AU - Shepherd, Charlie

AU - Brown, Michael

AU - Davidson, Craig

AU - Beckett, Christopher

AU - Flint, Stuart

N1 - Conference code: 18

PY - 2024/8/26

Y1 - 2024/8/26

N2 - The increasing development of renewable energy (e.g. on and offshore wind) has increased the demand on existing electricity transmission networks in the UK. However, the remoteness of the transmission network, particularly in Scotland, makes upgrade and renewal, both economically and environmentally challenging, with often highly restrictive access constraints. Steel grillages are an alternative non-concrete foundation that can be loaded immediately post-backfill and transported to remote locations using low-ground pressure vehicles or helicopters. This paper investigates the optimisation of steel grillages for overhead line foundations such that the uplift load-displacement response is comparable to solid foundations (i.e. a concrete pad). Initial 1g uplift tests have shown that the optimal grille-spacing-to-width ratio (𝑠/𝑤) for a comparable ultimate uplift capacity to a solid plate lies within 1 < 𝑠/𝑤 < 2.

AB - The increasing development of renewable energy (e.g. on and offshore wind) has increased the demand on existing electricity transmission networks in the UK. However, the remoteness of the transmission network, particularly in Scotland, makes upgrade and renewal, both economically and environmentally challenging, with often highly restrictive access constraints. Steel grillages are an alternative non-concrete foundation that can be loaded immediately post-backfill and transported to remote locations using low-ground pressure vehicles or helicopters. This paper investigates the optimisation of steel grillages for overhead line foundations such that the uplift load-displacement response is comparable to solid foundations (i.e. a concrete pad). Initial 1g uplift tests have shown that the optimal grille-spacing-to-width ratio (𝑠/𝑤) for a comparable ultimate uplift capacity to a solid plate lies within 1 < 𝑠/𝑤 < 2.

KW - Grillage

KW - Over head lines

KW - Foundation

KW - Uplift

U2 - 10.1201/9871003431749-654

DO - 10.1201/9871003431749-654

M3 - Conference contribution

SN - 978-1-032-54816-6

SP - 3316

EP - 3320

BT - Geotechnical Engineering Challenges to Meet Current and Emerging Needs of Society

A2 - Guerra, Nuno

A2 - Fernandes, Manuel Matos

A2 - Ferreira, Cristiana

A2 - Gomes Correia, António

A2 - Pinto, Alexandre

A2 - Sêco e Pinto, Pedro

PB - CRC Press

CY - Oxon

T2 - The XVIII European Conference on Soil Mechanics and Geotechnical engineering.

Y2 - 26 August 2024 through 30 August 2024

ER -