settlement pondasi sederhana

8/9/2019 Settlement Pondasi Sederhana

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REKAYASA PONDASI

M.SAM SUL HI DAYAT (022113145)

SETTLEMENT TOTAL

1.

Mencari qu (terzaghi) table

Sudut geser Nc Nq N c' Df h L B SF

Pondasi - - - - - 1 - 5 53.0sand loose ( 30) 37.16 22.46 19.73 16.5 0 - 5 - -

medium dense sand ( 40) 95.66 81.27 100.39 17.8 0 - 8 - -

clay ( 20) 17.69 7.44 4.97 18.2 20 - 10 - -

qu = 1.3cNc+ qNq+ 0.4BN = 1.3 (0x37.16) + (1x16.5)(22.46) + 0.4 (16.5x5x19.73) = 410.05 KN/m2

q ijin = qu / SF = 410.05 / 3 = 136.683 KN/m2

Q = q ijin (BxL) = 136.683 (5x5) = 3417.08 KN

2.

z ( distribusi tegangan), z = 5

q = x Df = 16.5 x 1 =16.5 KN/m3

m = 5/5 = 1 n = 5/5 = 1 I = 0.1752 (table 5.2)

z= q x I = 136.683 x 0.1752 = 23.94 KN/m2

B

5 m

8 m

10 m

sand loose

= 16.5 KN/m3

M. dense sand

= 17.8 KN/m3

clay

= 18.2 KN/m3

e = 0.9

Cc = 0.35

qu

1m


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REKAYASA PONDASI


3.

Settlement Elastic (Se)

Sudut geser Q B Es m n I3 I4

v Se

corner

(m)

I5 Se

center(m)

Pondasi - 5 - 1 1 0.838 0.167 - - 1.122 -

loose sand (35) 16.5 - 20000 - - - - 0.25 0.00140 - 0.00434

medium sand (40) 16.5 - 25000 - - - - 0.25 0.00112 - 0.00347

clay (20) 16.5 - 750 - - - - 0.5 - - 6.00674

m = L/B = 5/5 = 1

n = B/z = 5/5 = 1

I3= 0.838 (table 5.6)

I4= 0.167 (table 5.7)

I5= 1.122 (table 5.8)

Sand loose

Se(edge) =

(1-0,252) [0,838 -( -

). 0,167]

Se = 0.00140 m = 1.4 mm

Se(center) =

(1-0,25

2) . 1,122

se = 0.00434 m = 4.34 mm

Medium Dense Sand

Se(edge) =

(1-0,252) [0,838 -( -

). 0,167]

Se = 0.00112 m = 1.12 mm


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REKAYASA PONDASI


Se(center) =

(1-0,252) . 1,122

se = 0.00347 m = 3.47 mm

Clay

rumus janbu

Df/B 1 h/B L/B 2 Se

2 0.9 2 1 0.36 6.00674

1 = 0.9 (table 5.15)

2 = 0.36 (table 5.16)

Se = 6.00674 m

4. Settlement Pondasi (Sc)

Sudut geser E Cc Hc h1 h2 Iav(h1) Iav(h2) 0 av Sc

Pondasi - - - - 65.274 -

loose sand (30) - - -12

0.37 0.2

99

- 0.11288medium sand(40) - - -

22

63,92- 0.11288

clay (20) 0.9 0.35 10267,813

- -

h1= h medium dense sandDf + h sand loose = 81 + 5 = 12 m

h2= h sand loosedf + h medium dense sand + h clay = 51 + 8 + 10 = 22 m

0 = (Df/h)*I3=1/5 *0.838 = 99

0 = h*(9.81) = 8(17.8-9.81) = 63.92

0 = 3/2*(9.81) = 3/2(18.2-9.81) = 267.813

0 (total) = 430.733

Iav(h1) = 0.37 ( table 5.31)

Iav(h2) = 0.2(table 5.31)


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REKAYASA PONDASI


av = 65.274

Untuk loose sand dan medium sand

Sc = 0.11288 m

Stotal = Se + Sc = (0.00434+0.00347+6.00674) + 0.11288 = 6.12744m


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REKAYASA PONDASI


LAMPIRAN


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REKAYASA PONDASI


settlement pondasi sederhana

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