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PILECAP DESIGN FOR 2 PILES WITH A SINGLE COLUMN THICKNESS OF PILECAP (T) = 0.70 m CLEAR COVER = 0.075 m WIDTH OF PILECAP (B) = 0.83 m LENGTH OF PILECAP (L) = 2.83 m WIDTH OF COLUMN (b) = 0.60 m DEPTH OF COLUMN (d) = 0.30 m fck FOR PILECAP = 30 Mpa fy FOR PILECAP = 415 Mpa THICKNESS OF SOIL LAYER ABOVE PILECAP = 0.70 m 3 UNIT WEIGHT OF SOIL ABOVE PILECAP = 18.00 kN/m CLEAR CANTILEVER FROM PILE = 0.15 m DIAMETER OF PILES = 0.53 m UNFACTORED REACTIONS AT COLUMN BASE Fy (kN) Fx (kN) Fz (kN) Mx (kN.m) Mz (kN.m) COLUMN 1 643.00 2.00 0.60 0.00 50.00

C

Y

0.7

X Z

2.825 0.6 0.825

1

0.3

COLUMN MOMENT DUE TO SHEAR AT PILECAP BASE (MX') MOMENT DUE TO SHEAR AT PILECAP BASE (MZ') TOTAL BENDING MOMENT (MX) TOTAL BENDING MOMENT (MZ) TOTAL VERTICAL UNFACTORED FORCE

2

0.42 -1.40 0.42 48.60 713.15

kN.m kN.m kN.m kN.m kN

PILE NO. 1 2

2

rxi (m)

rxi

1.000 1.000 2 Σrxi =

1.00 1.00 2.00

FINAL FORCES IN PILE (kN) 332 381

1 332 kN

X Z

2 381 kN

0.6

0.4375 2.00

0.15

1.475

332 kN 381 kN SECTION ALONG X

MAXIMUM ULTIMATE BENDING MOMENT (MUZ) EFFECTIVE DEPTH ALONG-X DIRECTION EFFECTIVE DEPTH ALONG-Z DIRECTION X-DIRECTION Ast REQUIRED

= 250 = 0.619 = 0.607

kN.m m m

= 1155

mm

2

MIN. Ast REQUIRED DIA. OF MAIN BARS DIA. OF DISTRIBUTION BARS REQUIRED NOS. OF MAIN BARS PROVIDED SPACING OF MAIN BARS REQUIRED SPACING OF DISTRIBUTION BARS PROVIDED SPACING OF DIST. BARS Z-DIRECTION MIN. Ast REQUIRED DIA. OF DISTRIBUTION BARS REQUIRED SPACING OF MAIN BARS PROVIDED SPACING OF DIST. BARS

= 613 = 12 =8 = 10 =5 = 12 =5

mm mm mm mm mm mm mm

2

= 728 = 12 = 489 = 200

mm2 mm mm mm

CHECK FOR SHEAR ONE-WAY SHEAR ALONG-X

326

0.619

0.619

498

0.525

374

571

1.475

0.525

SHEAR FORCE DISTRIBUTION MAXIMUM ULTIMATE SHEAR AT CRITICAL SECTION (VU) ULTIMATE SHEAR STRESS (τu) pt OF STEEL PROVIDED (%) SHEAR STRESS IN CONCRETE (τC)

= 374 = 0.73 = 2.96 = 0.96

kN

SHEAR STRESS RESISTED BY DIST. STEEL (τus)

= 0.25

N/mm2

TOTAL SHEAR STRESS RESISTED BY SECTION = 1.20 DESIGN FOR SHEAR IS NOT REQUIRED IN X-DIRECTION.

N/mm2 % N/mm2 N/mm

2

TWO-WAY SHEAR ALONG-X

505

0.310

0.310

498

0.525

565

571

1.475

0.525

SHEAR FORCE DISTRIBUTION MAXIMUM ULTIMATE SHEAR AT CRITICAL SECTION (VU) = 565 ULTIMATE SHEAR STRESS (τu) = 0.28 SHEAR STRESS IN CONCRETE (τC) = 1.37

kN

ks.τc SECTION IS OK IN SHEAR.

N/mm2

= 1.37

N/mm2 N/mm2

X-DIRECTION Ast REQUIRED MIN. Ast REQUIRED DIA. OF MAIN BARS DIA. OF DISTRIBUTION BARS NO OF BARS REQUIRED FOR MAIN STEEL NO OF BARS REQUIRED FOR DIST. STEEL REQUIRED SPACING OF MAIN BARS REQUIRED SPACING OF DISTRIBUTION BARS Z-DIRECTION Ast REQUIRED

= 1155

mm2 2

= 613 = 12 =8 = 10 = 12 = 72 = 60

mm mm mm

= 728

mm2

MIN. Ast REQUIRED DIA. OF MAIN BARS

= 728 = 12

2

NO OF BARS REQUIRED FOR MAIN STEEL

=6

REQUIRED SPACING OF MAIN BARS

= 489

mm mm

mm mm

15 0.15 0.2 0.25 0.5 0.75 1 1.25 1.5

0.28 0.315 0.35 0.46 0.54 0.6 0.64 0.68

1.75

0.71

2 2.25 2.5 2.75 3

0.71 0.71 0.71 0.71 0.71

mm 2.5 2.8 3.1 3.5

20

25

30

0.28 0.315 0.36 0.48 0.56 0.62 0.67 0.72

0.29 0.325 0.36 0.49 0.57 0.64 0.7 0.74

0.29 0.33 0.37 0.5 0.59 0.66 0.71 0.76

0.75

0.78

0.8

0.79 0.81 0.82 0.82 0.82

0.82 0.85 0.88 0.9 0.92

0.84 0.88 0.91 0.94 0.96

15 20 25 30

2 3 4 5

2.75 3 2.96

5

0.94 0.96 0.956703