Chance Technical Design Manual

PILE CAP CONFIGURATION, TABLE 4-15

PILE CAP PLATE SIZE SELECTOR LIMITING PILE WORKING LOADS CONTROLLED BY COMPRESSIVE STRENGTH OF CONCRETE

STEP 1

CONCRETE COMPRESSIVE STRENGTH (psi)

COMPRESSIVE WORKING LOAD ON HELICAL PILE (lb)

3,000 3,500 4,000 4,500 5,000

14,100 16,800 19,200 21,600 24,000

32,400 37,800 43,200 48,600 54,000

57,600 67,200 76,800 86,400

90,000 105,000 120,000

96,000 RECOMMENDED PILE CAP SIZE

4” x 4”

6” x 6”

8” x 8”

10” x 10”

PILE CAP PLATE THICKNESS SELECTOR LIMITING PILE WORKING LOADS CONTROLLED BY BENDING STRESS IN PLATE OVERHANG

STEP 2

PILE CAP SIZE (FROM STEP 1 ABOVE)

HELICAL PILE SHAFT SERIES

PILE CAP THICKNESS

4” X 4”

6” X 6”

8” X 8”

10” X 10”

COMPRESSIVE WORKING LOAD ON HELICAL PILE (lb)

1/4” 3/8” 1/2” 3/4” 1/4” 3/8” 1/2” 3/4” 1/4” 3/8” 1/2” 3/4” 1/4” 3/8” 1/2” 3/4” 1/4” 3/8” 1/2” 3/4” 1/4” 3/8” 1/2” 3/4” 1” 1” 1”

23,200 52,200

9,780

7,080 15,900 28,300 63,700 8,080 18,200 32,300 72,700 10,800 24,400 43,300 97,500 5,000 10,000 18,000 40,000 75,000 6,000 11,000 20,000 45,000 80,000 6,500 13,000 22,000 50,000 90,000

5,330 12,000 21,300 47,900 6,250 14,100 25,000 56,300 100,000 8,080 18,200 32,300 72,700 4,000 9,000 16,000 35,000 65,000 5,000 10,000 18,000 38,000 70,000 5,500 11,000 19,000 42,000 75,000

RS2875.203 RS2875.276

22,000 39,100 88,000 12,100 27,200 48,300 109,000 20,000 45,000 80,000 6,000 12,000 25,000 50,000 90,000 7,000 15,000 27,000 60,000 105,000 9,000 18,000 32,000 71,000

RS3500.300

RS4500.337

10,000 21,000 40,000 85,000 14,000 31,000 56,000

SS5 SS150

LOAD DETERMINATION

SS175

21,000 45,000 82,000

SS200

1”

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