Field evaluation of grillage foundation uplift capacity
- Cornell Univ., Ithaca, NY (USA). Geotechnial Engineering Group
This study presents the results of eight full-scale field uplift tests on steel grillage foundations. The two field sites where the tests were conducted in New York State are described, along with the three grillage types found at these sites. Structural and construction details of the grillages are given. Soil characterization of the sites was conducted using a variety of in-situ test methods including the standard penetration, cone penetration, pressuremeter, borehole shear, drive cone, and dilatometer tests. Laboratory classification and strength tests also were performed to aid in the characterizations. The field testing equipment and the test procedures used for the uplift tests are described. The load-displacement results are given, as well as the ground movements in the zones above the grillages. The vertical shear model reported in EPRI EL-2870 is used to predict the uplift capacities, and comparisons are made with the field measurements. The vertical shear model, coupled with well-documented geotechnical properties, can be used to predict accurately the uplift capacity of grillage foundations. For grillages in granular soils, the incorporation of side shearing resistance is important. The field test results indicated that, for D/B ratios from 1 to 3, roughly 55 to 80 percent of the uplift capacity is attributable to side resistance, with only 20 to 45 percent of the capacity resulting from soil weight. This result is important when deciding on the allowable loadings that may be imposed from upgradings and increased tower heights. The use of existing foundations may result in substantial cost savings over new foundations, provided that adequate subsurface exploration and geotechnical data are incorporated into the planning and design stages. 63 refs., 224 figs., 82 tabs.
- Research Organization:
- Electric Power Research Inst., Palo Alto, CA (USA); Cornell Univ., Ithaca, NY (USA). Geotechnial Engineering Group
- Sponsoring Organization:
- EPRI
- OSTI ID:
- 6621506
- Report Number(s):
- EPRI-EL-6965
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
FOUNDATIONS
DESIGN
POWER TRANSMISSION TOWERS
CONSTRUCTION
SOILS
FIELD TESTS
BOREHOLES
DYNAMIC LOADS
EXPERIMENTAL DATA
HEIGHT
MEASURING METHODS
MECHANICAL PROPERTIES
POWER TRANSMISSION LINES
SAMPLING
SITE CHARACTERIZATION
STRENGTH FUNCTIONS
TECHNOLOGY ASSESSMENT
CAVITIES
DATA
DIMENSIONS
FUNCTIONS
INFORMATION
MECHANICAL STRUCTURES
NUMERICAL DATA
SUPPORTS
TESTING
TOWERS
240303* - Power Transmission Lines & Cables- Overhead Lines- (1990-)
360603 - Materials- Properties