Transmission And Substation Foundations - Technical Design Manual (TD06088E)

DESIGN EXAMPLE 7 TYPE RS HELICAL PILES FOR SUBSTATION LATERAL SUPPORT SYMBOLS USED IN THIS DESIGN EXAMPLE

C...............................................................COHESION FACTOR OF SOIL 7-4O P s .............................................APPLIED HORIZONTAL SHEAR LOAD 7-4O C u .............................................................................. COHESION OF CLAY 7-4O D...............................................................DIAMETER OF FOUNDATION 7-4O L............................................... MINIMUM LENGTH OF FOUNDATION 7-4O e........................................................................................... ECCENTRICITY 7-4O F......................................................................................BENDING STRESS 7-4O M POS mAX ............................................. MAXIMUM BENDING MOMENT 7-4O FS..............................................................................FACTOR OF SAFETY 7-4O

DESIGN EXAMPLES

Purpose This design example is intended to assist with the design of new construction substation structures that requires a low axial load with high shear load on a single pile. This example will show how to calculate the lateral capacity of a single pile using the Broms’ Method for a 345KV medium switch support. After the loads for the structure have been determined, it is possible to design the piles.

Page 7-39 | Hubbell Power Systems, Inc. | All Rights Reserved | Copyright © 2017