Transmission And Substation Foundations - Technical Design Manual (TD06088E)

DESIGN METHODOLOGY SECTION 4

CONTENTS

STRUCTURAL LOADS................................................................................. CHANCE ® HELICAL ANCHOR/PILE BEARING CAPACITY............

4-5

4-6

EVALUATING SOIL PROPERTIES FOR DESIGN................................

4-24

FACTOR OF SAFETY...................................................................................

4-32

HELICAP ® HELICAL CAPACITY DESIGN SOFTWARE.....................

4-34

APPLICATION GUIDELINES FOR CHANCE ® HELICAL PILES/ANCHORS.......................................................................

4-40

LATERAL CAPACITY OF HELICAL PILES............................................

4-41

BUCKLING/SLENDERNESS CONSIDERATIONS...............................

4-49

CHANCE ® HELICAL PILE/DEFLECTION AT WORKING LOAD....

4-54

SYMBOLS USED IN THIS SECTION

Pw ................................................................................Pier Working Load

4-5

DL .................................................................................................Dead Load

4-5

DESIGN METHODOLOGY

LL ....................................................................................................Live Load

4-5

SL ................................................................................................. Snow Load

4-5

W .....................................................................................................Soil Load

4-5

FS h ............................................................. Factor of Safety (hardware) B ...........................................Helix Diameter & Footing Width (Base)

4-5

4-6

x .............................................................................................. Helix Spacing

4-6

Q ULT .........................................................Ultimate Capacity of the Soil 4-8 A h ............................................................................... Projected Helix Area 4-8 c .............................................................................................. Soil Cohesion 4-8 q’ ...........................................................Effective Overburden Pressure 4-8 γ ’ .......................................................Effective Unit Weight of the Soil 4-8 N c .....Bearing Capacity Factor for Cohesive Component of Soil 4-8 N q .Bearing Capacity Factor for Non-Cohesive Component of Soil 4-8

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