Abstract
This report is a state-of-the-art assessment of foundation engineering for transmission
line structures, with particular emphasis on uplift/compression foundation
design loads. The scope of this report is broad and includes many aspects of geotechnical,
foundation and structural engineering. After presenting the basic
analysis/design philosophy, strategies for site characterization are described.
Procedures for site reconnaissance, field exploration and laboratory testing follow.
Detailed methodologies are given to evaluate the compression and uplift capacities
of foundations in soil, including procedures to predict foundation movements.
Evaluation of foundations in rock and anchors follows. Load test procedures
and methods to evaluate load test results are described, with illustrations
that confirm the design methodologies. The response of transmission line structures
to differential foundation movements is presented with examples, and an illustration
is given of total structure response to foundation movements. A summary
section is given to provide an overview of the foundation analysis/design methodology,
and the report is concluded with detailed research recommendations. Appendices
provide further information on several of the topics. A supplemental volume
has also been prepared which includes data on 804 foundation load tests.
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