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T ugas Ak hir
Perencanaan Struktur Gedung Sekolah 2 Lantai
66
BAB 5 Plat Lantai ATAP
5.7. Penulangan lapangan arah x
Mu = 435,99 kgm = 4,35599.10
6
Nmm Mn =
φ Mu
=
6 6
10 .
44 ,
5 8
, 10
. 4,35599
= Nmm
Rn =
=
2
.dx b
Mn =
2 6
95 .
1000 10
. 44
, 5
0,602 Nmm
2
m = 294
, 11
25 .
85 ,
240 .
85 ,
= =
c f
fy
ρ
perlu
= ⎟⎟⎠
⎞ ⎜⎜⎝
⎛ −
− fy
Rn .
m 2
1 1
. m
1
= ⎟⎟⎠
⎞ ⎜⎜⎝
⎛ −
− 240
602 ,
. 294
, 11
. 2
1 1
. 294
, 11
1 =
0,00255 ρ
ρ
max
ρ ρ
min
, di pakai ρ
perlu
= 0,00255 As =
ρ
min
. b . dx = 0,00255. 1000 . 95
= 242,25
mm
2
Digunakan tulangan ∅ 10
As = ¼ .
π . 10
2
= 78,5
mm
2
S =
perlu
As b
As. =
25 ,
242 1000
. 5
, 78
= 324,045 ~ 330 mm Jarak maksimum = 2 x h
= 2 x 120 =
240 mm
n = s
b
= 240
1000 = 4,2
∼ 5
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As ada = 5. ¼ .
π . 10
2
= 392,5
mm
2
As…...............OK ☺
Dipakai tulangan
∅ 10 – 240 mm
Cek kapasitas lentur : a =
b c
f fy
As
ada
. .
85 ,
. =
1000 .
25 .
85 ,
240 .
5 ,
392 = 4,433 mm
M
n
= As
ada
.fy.d-a2 = 8,740.10
6
Nmm Mn ada Mn = 8,740.10
6
6
10 .
44 ,
5 → OK
☺ 5.8.
Penulangan lapangan arah y
Mu = 435,99 kgm = 4,35599.10
6
Nmm Mn =
φ Mu
=
6 6
10 .
44 ,
5 8
, 10
. 4,35599
= Nmm
Rn =
=
2
.dx b
Mn =
2 6
95 .
1000 10
. 44
, 5
0,602 Nmm
2
m = 294
, 11
25 .
85 ,
240 .
85 ,
= =
c f
fy
ρ
perlu
= ⎟⎟⎠
⎞ ⎜⎜⎝
⎛ −
− fy
Rn .
m 2
1 1
. m
1
= ⎟⎟⎠
⎞ ⎜⎜⎝
⎛ −
− 240
602 ,
. 294
, 11
. 2
1 1
. 294
, 11
1 =
0,00255 ρ
ρ
max
ρ ρ
min
, di pakai ρ
perlu
= 0,00255 As =
ρ
min
. b . dx = 0,00255. 1000 . 95
= 242,25
mm
2
Digunakan tulangan ∅ 10
As = ¼ .
π . 10
2
commit to user
T ugas Ak hir
Perencanaan Struktur Gedung Sekolah 2 Lantai
66
BAB 5 Plat Lantai ATAP
= 78,5
mm
2
S =
perlu
As b
As .
= 25
, 242
1000 .
5 ,
78 = 324,045 ~ 330 mm
Jarak maksimum = 2 x h = 2 x 120
= 240
mm n =
s b
= 240
1000 = 4,2
∼ 5 As ada
= 5. ¼ . π . 10
2
= 392,5
mm
2
As…................... OK ☺
Dipakai tulangan
∅ 10 – 240 mm
Cek kapasitas lentur : a =
b c
f fy
As
ada
. .
85 ,
. =
1000 .
25 .
85 ,
240 .
5 ,
392 = 4,433 mm
M
n
= As
ada
.fy.d-a2 = 8,740.10
6
Nmm Mn ada Mn = 8,740.10
6
6
10 .
44 ,
5 → OK
☺
5.9. Rekapitulasi Tulangan
Dari perhitungan diatas diperoleh : Tulangan lapangan arah x
∅ 10 – 240 mm
Tulangan lapangan arah y
∅ 10 – 240 mm
Tulangan tumpuan arah x
∅ 10 – 120 mm
Tulangan tumpuan arah y
∅ 10 – 120 mm
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Tabel 5.2. Penulangan Plat Lantai
Tipe Plat
Momen Tulangan Lapangan
Tulangan Tumpuan Mlx
kgm Mly
kgm Mtx
kgm Mty
kgm Arah x
mm Arah y
mm Arah x
mm Arah y
mm A
323,98 386,69 - -877,9
∅10–200 ∅10–240 ∅10–125 ∅10–125 B1
435,99 435,99 -
1058,84 -
1058,84 ∅10–200 ∅10–200 ∅10–125 ∅10–125
B2 404,85
327 - 937,28
- 856,42 ∅10–200 ∅10–200 ∅10–125 ∅10–125
B3 327
327 - 809,71
- 809,71 ∅10–200 ∅10–200 ∅10–125 ∅10–125
C1 205,78
73,96 - 459,75
- 307,53 ∅10–200 ∅10–200 ∅10–125 ∅10–125
C2 214,104
81,75 - 443,78
- 303,64 ∅10–200 ∅10–200 ∅10–125 ∅10–125
C3 330,88 151,82
- -
463,24 ∅10–200 ∅10–200 ∅10–125 ∅10–125
5.10. Perencanaan Plat Atap
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