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Perencanaan Balok Crane

60cm

90cm

80cm

20mm

10mm

20cm 20cm38 cm

10mm 10mm

IV

II III

I

55,87cm

34,13cm

x=40cm

Sb Y

Sb X

Y=

FI = 60 x 1 = 60 cm 2

FII = 1 x 87 = 87 cm 2

FIII = 1 x 87 = 87 cm 2

FIV = 80 x 2 = 160 cm 2

* Garis Berat Penampang

= 1 1 + 2 2 + 3 3 + 4 4 =

600,5 + 8744,5 + 8744,5 + (16089)

394

=30+3871,5+3871,5+14.240

394= 55,7 cm

= 55,87 cm

X = 40 cm

Luas Penampang

A = A1 + A2 + A3 + A4

= (60x1) + (1x87) + (1x87) + (80x2)

= 60 + 87 + 87 + 160

= 394 cm 2

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Momen Inersia arah-x (sumbu kuat penampang)

Ix = Ix 1 + Ix 2 + Ix 3 + Ix 4

Ix1 =1

12 b h3 + F a2 =

1

12 60 13

+ 60 (55,87 0,5)2

=1

12 60 1 + 6 0 (3.065,84) = 183.955,4 cm 4

Ix2 =1

12 1 87 3 + 87 (55,87 12 8 7 + 1 ) 2 =

1

12 1 87 3 + 87 (11,37) 2 =

1

12 1 658.503 + 87 129,28 = 66.122,61 cm 4

Ix3 = Ix 2

Ix4 =1

12 80 23 + 160 (34,13 1) 2 =

1

12 80 8+160 1.097,60 = 175.669,3 cm 4

Ix = Ix 1 + Ix 2 + Ix 3 + Ix 4

= 183.955,4 + 66.122,61 + 66.122,61 + 175.669,3

= 491.869,92 cm 4

Momen inersia arah-y (sumbu lemah penampang)

Iy =1

12 60 3 1 + 112 80 3 2 + 112 87 13 2 + 87 1 19,5 2 2 = 18.000 + 85.333,33 + 14,5 + 66.163,5

= 169.511,33 cm 4

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P (Beban Bergerak) = 10 ton = 10.000 kg

Q bs (profil) = = 0,394 2 7,850 3 = 3,10 / = 3,0929 t/m

= 3,10 t/m

Q bs (crane) = 200 kg

Tegangan tarik pada web sebesar :

f t =P

7t w<

=(10.000+200)

71

0,75 (10.200 kg )

2400 kg / 2= 3,19 cm 2

tf > 1,79 cm 2

ambil t f = 2 cm = 20 mm

f b =0,75 P

t f 2<

=0,75 (10.000+200)

2 2 <

= 1.912,5 < y = 2400 kg/cm 2

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Pembebanan Balok Crane

4,5m'

9m'

5 ton 5 ton

? = 1,20 m'

= 1,20 m (Lihat Tabel Hoist Crane Single Girder)

< 0,586 L

< 0,586 . 9

< 5,274 m

Mmax

=5

2(9) (9

1,20

2) 2

= 19,6 tm x 1,15 (ambil impact factor = 15 %)

= 22,54 tm

V = P ( 2 al )= 5 ( 2 1,209 ) = 9,33 ton

10 ton + 0,2 ton

9m'

Q bs (profil) = 3,10 t/m Q footwalk = 0,40 t/m +

Q total = 3,50 t/m

= 1,20 m

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Wy =Iyx

=136.429,58

20 = 6.821,479 cm 3

y = Mywy =6,427 10 5 kg cm

6.821,479 cm 3

= 94,22 kg/cm 2

= x 2 + y 2 + xy = 663,69 2 + 94,22 2 + 663,69 x 94,22 = 715,47 kg/cm 2 < s = = 24001,5 = 1.600 kg/cm 2

Profil balok crane yang dipakai aman digunakan...................