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Application of reliability based design concepts to transmission line structure foundations

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2 Author(s)
DiGioia, A.M., Jr. ; GAI Consultants Inc., Monroeville, PA, USA ; Rojas-Gonzalez, L.F.

A procedure is proposed for the design of power transmission line structure foundations using a probability-based load and resistance factor design (LRFD) format. This procedure involves the determination of a foundation strength factor, φF, which is used as a multiplier of the calculated nominal design strength to estimate the 5% exclusion limit strength required in the LRFD equation. Statistical analysis of the results from full-scale load tests are used to obtain φF values applicable to various nominal design strength equations for drilled shafts subjected to uplift loads. These results clearly illustrate the significant economic benefits of conducting more detailed subsurface investigations for the design of transmission line structure foundations. A design example is presented

Published in:

Power Delivery, IEEE Transactions on  (Volume:6 ,  Issue: 1 )

Date of Publication:

Jan 1991

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