Chance Technical Design Manual

COMPRESSION

COMPRESSION

Q C

Q C

GROUND SURFACE

GROUND SURFACE

5 B 1 MIN DEPTH

5 B 1 MIN DEPTH

B

B 1

1

B 2

B 2

SIDE RESISTANCE CAPACITY ≈ 0

HELIX SPACING ≥ 3B

HELIX SPACING < 3B

B 3

B 3

PERIMETER SHEAR 5-3b

INDIVIDUAL PLATE BEARING 5-3a

TENSION

TENSION

Q T

Q T

5 � (1.5 m) OR 5B 1 (WHICHEVER IS GREATER) MIN DEPTH

5 � (1.5 m) OR 5B 1 (WHICHEVER IS GREATER) MIN DEPTH

GROUND SURFACE

GROUND SURFACE

B 1

B 1

DESIGN METHODOLOGY

B 2

B 2

SIDE RESISTANCE CAPACITY ≈ 0

HELIX SPACING ≥ 3B

HELIX SPACING < 3B

B 3

B 3

PERIMETER SHEAR 5-3d

INDIVIDUAL PLATE BEARING 5-3c

COMPARISON BETWEEN INDIVIDUAL PLATE BEARING AND PERIMETER SHEAR FOR COMPRESSION AND TENSION LOADING FIGURE 5-3

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