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Tugas Akhir Perencanaan Struktur Kafe dan Resto 2 Lantai
BAB 6 Balok Anak 6.4.Pembebanan Balok Anak as B’
6.2.1. Pembebanan
Gambar 6.4 Lebar Equivalen Balok Anak as B’
Perencanaan Dimensi Balok h = 112 . Ly
= 112 . 3750 = 312,5 mm = 350 mm
b = 23 . h = 23 . 312,5
= 250 mm h dipakai = 350 mm, b = 250 mm
1. Beban Mati q
D
Pembebanan balok A’ 1 – 3 Berat sendiri
= 0,25x0,35–0,12 x 2400 kgm
3
= 138 kgm Beban plat
= 2 x 1,06 x 411 kgm
2
= 871,32 kgm qD
1
=1009,32 kgm Pembebanan balok A’ 3 – 6
Berat sendiri = 0,25x0,35–0,12 x 2400 kgm
3
= 138 kgm Beban plat
= 2 x 1,09 x 411 kgm
2
= 895,98 kgm qD
2
=1033,98 kgm 2. Beban hidup q
L
Beban hidup digunakan 250 kgm
2
qL
1
= 2 x 1,06 x 250 kgm
2
= 530 kgm qL
2
= 2 x 1,09 x 250 kgm
2
= 545 kgm
3
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Tugas Akhir Perencanaan Struktur Kafe dan Resto 2 Lantai
BAB 6 Balok Anak
3. Beban berfaktor q
U
qU
1
= 1,2. qD + 1,6. qL = 1,2 . 1009,32 + 1,6.530
= 2059,18 kgm qU
2
= 1,2. qD + 1,6. qL = 1,2 . 1033,98 + 1,6.545
= 2112,77 kgm
6.2.2. Perhitungan Tulangan
Tulangan Lentur Balok Anak Data Perencanaan :
h = 350 mm Ø
t
= 16 mm b = 250 mm
Ø
s
= 8 mm p = 40 mm
d = h - p - 12 Ø
t
- Ø
s
fy = 360 Mpa = 350 – 40 - 12.16 - 8
f’c = 25 Mpa = 294
Tulangan Lentur Daerah Lapangan
ρb = ⎟⎟⎠
⎞ ⎜⎜⎝
⎛ + fy
600 600
fy c.
β 0,85.f
=
⎟ ⎠
⎞ ⎜
⎝ ⎛
+ 360 600
600 85
, 360
25 .
85 ,
= 0,031 ρ
max
= 0,75 . ρb
= 0,75 . 0,031 =
0,0232 ρ
min
= 0038
, 360
4 ,
1 4
, 1
= =
fy
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Tugas Akhir Perencanaan Struktur Kafe dan Resto 2 Lantai
BAB 6 Balok Anak Daerah Tumpuan
Dari perhitungan SAP 2000 diperoleh
:
Mu = 2800,35
kgm = 2,8003 . 10
7
Nmm Mn =
φ Mu
=
7 7
10 .
5 ,
3 8
, 10
. 8003
, 2
=
Nmm
Rn =
=
2
.d b
Mn
= ×
2 7
294 250
10 .
5 ,
3 1,62 Nmm
2
m = =
= 0,85.25
360 c
0,85.f fy
17 ρ
perlu
= ⎟⎟⎠
⎞ ⎜⎜⎝
⎛ −
− fy
Rn .
m 2
1 1
. m
1
= ⎟⎟⎠
⎞ ⎜⎜⎝
⎛ ×
× −
− 360
62 ,
1 17
2 1
1 .
17 1
= 0,0046 ρ
ρ
max
ρ ρ
min
, di pakai ρ
perlu
= 0,0046 As =
ρ
perlu
. b . d = 0,0046 . 250 . 294
= 338,1 mm
2
Digunakan tulangan D 16 = ¼ .
π . 16
2
= 200,96 mm
2
Jumlah tulangan =
68 ,
1 96
, 200
1 ,
338 =
~ 2 buah.
Dipakai 2 D 16 mm
As ada = 2 . ¼ .
π . 16
2
= 401,92 mm
2
As ……… aman a =
250 25
85 ,
360 92
, 401
b c
f 0,85
fy ada
As ×
× ×
= ×
× ×
= 27,23
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Tugas Akhir Perencanaan Struktur Kafe dan Resto 2 Lantai
BAB 6 Balok Anak
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