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A. Balok Induk (Profil WF)

1. The document calculates load and moment capacities for a composite girder bridge profile. 2. It determines the dead, live, wind, and braking loads per meter and calculates the total design moment of 108974.64 kgm. 3. The profile's moment capacity of 536897.02 kgm is over 4.93 times the design moment, indicating it is sufficiently strong.

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Aji Greenerd
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37 views6 pages

A. Balok Induk (Profil WF)

1. The document calculates load and moment capacities for a composite girder bridge profile. 2. It determines the dead, live, wind, and braking loads per meter and calculates the total design moment of 108974.64 kgm. 3. The profile's moment capacity of 536897.02 kgm is over 4.93 times the design moment, indicating it is sufficiently strong.

Uploaded by

Aji Greenerd
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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A.

BALOK INDUK ( PROFIL WF )

1. KUAT LENTUR (MR)


be =

L
4

822
4

= 205,5 cm

be = bo = 800/5 = 160 cm ( digunakan )


be = bf + 16.he = 50 + 16.20 = 370 cm

As = 114.2 cm2
H = 0
Cc + Ts = Ts
0,85.(be).(a).fc + As.fyR = As.fy
0,85.(160).(a).(270) + 114,2.(350) = 114,2.(3000)
a = 8,18

Zs =

50
2

+ 25 -3 = 50,4 cm

Zc =

50
2

+ 25 -

8,18
2

= 47 cm

Cc = 0,85.8,18.(160).(2700) = 3003,696 kg
Ts = As.fyR
= 114,2.(3500)
= 399700
Mn = Cc.Zc + Ts.Zs
= (3003,696).(47) + (399700).(50,4)
= 20.285.912,71 kgcm
= 202859 kgm
MR = 0,85.Mn
= 0,85. 202859
= 172430,15kgm

2. PEMBEBANAN
Beban mati/ hidup dihitung per pias 2m (2m = jarak antar profil).
a. Beban Mati Tambahan
Air
: 0,05 x 1000 x 2
= 100 kg/m
Aspal + Overlay : (0,08 + 0,05) x 1800 x 2
= 374,4 kg/m
qD = 454,4 kg/m
MD1 = 1/8. (454,4). (8,22)2 = 3837,88 kgm
b. Beban Mati Tetap
Lantai kendaraan : 0,25 x 2400 x 2
Profil
: tabel
Diafragma
: dipasang tiap 1m
MD2 = 1/8. (1414,2). (8,22)2 = 11944,4 kgm

c. Beban Jalur

= 1200 kg/m
= 114,2 kg/m
=
100 kg/m
qD = 1414,2 kg/m

Beban merata (q) = 1,6 (900)


Beban garis (P) = 1,6 (4900)
Beban kejut
= 1,4 ( untuk beban garis )

= 1440 kg/m
= 7840 kg

1
1
2
ML = . 4 . P . L+ 8 .q . L
1
1
2
= 1,4. 4 . 7840.8,22+ 8 .1440 .8,22
= 34717,99 kgm

d = 0,25 + 0,1 + 0,468


= 0,818
e = 1 + 0,08 + 0,1 + 0,468
= 1,648
Cw
Vw

= 1,2
= 30 m/detik ( untuk daerah bukan pantai > 5km dari pantai )
2+ L
TEW1 = 0,0012. Cw. (Vw)2.
L
= 0,0012. (1,2). (30)2. (2)
= 2,592 kN/m
= 259,2 kg/m

d. Beban Angin

b/d = 9,74/0,818 =11,90


b/d > 6; Cw = 1,25
TEW2 = 0,0006. Cw. (Vw)2.

d+ L
L

= 0,0006. (1,25). (30)2. (0,818)


= 0,552 kN/m
= 55,2 kg/m
d
qW. (1,6) = TEW1 (e) + TEW2 ( 2 )
qW. (1,6) =259,2. (1,648) + 55,2 (

0,818
2

= 449,73kg/m
M=

1
8

. (449,73).(8,22)2 = 3798,44 kgm

e. Beban Rem

e = 1,8 + 0,08 + 0,443 = 2,323


MRem = qR (L).(e) + pR.(e)
= 64.(8,22). (2,323) + 480.(2,323)
= 2579,36 kgm
Beban

M (kgm)

F beban

Mu (kgm)

Beban Mati Tambahan


Beban Mati Tetap
Beban Jalur
Beban Angin
Beban Rem

6200
20677,5
33472
4001,2
2579,36

2
1,3
1,8
1,2
1,8

12400
26880,75
60249,6
4801,44
4642,848

Mutotal = 108974,64 kg/m

Tul Gelagar Komposit


MR = 536897,02 kgm > Mu (OKE)
Rasio =

MR
Mu

= 4,93 kali lebih kuat

f. Share Connector ( dipilih yang terkecil )


k = Cc + Ts
= 1883600 + 85728
= 1969328
k = Ts
= As.fy
= 114,2.(2400)
= 274080 ( dipilih )

Ec = 4700

fc '

= 4700 25
= 23500 Mpa
= 235000 kg/cm2
Dicoba penghubung geser dengan ukuran 13mm x 50mm
Maksimum diameter yang diijinkan adalah 2,5 tf = 2,5 x 16 = 40 > 13mm... ok
Luas tampang untuk satu konektor
Asc = x 132 / 4 = 132,7323 mm2
Qn = 0,5 Asc

f c ' . Ec

Qn = 0,5 132,7323
= 50868,69 N

25.23500

= 50,86 kN
N=

k
Qn
274080
50,86

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