Article,

Transmission Line Structure Foundations for Uplift-Compression Loading EL-2870 Research Project 1493-1

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(1983)

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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