commit to user
Tugas Akhir
Pe re nc a na a n Struktur Ba ng una n Se ko la ha n 2 La nta i
BAB 3 Perencanaan Atap
14 1,875 15 2,165
16 2,165 17 1,083
18 2,165 19 2,165
20 2,864 21 2,165
22 2,864 23 2,165
24 2,864 25 2,165
26 2,864 27 2,165
28 2,165 29 1,083
commit to user
Tugas Akhir
Pe re nc a na a n Struktur Ba ng una n Se ko la ha n 2 La nta i
BAB 3 Perencanaan Atap
a b
c d
e f
g h
3.6.2. Perhitungan luasan kuda-kuda trapesium
Gambar 3.16. Luasan Atap Kuda-kuda Trapesium
Panjang ah = 4,245 m
Panjang bg = 3,276 m
Panjang cf = 2,336 m
Panjang de = 1,875 m
Panjang ab = 1,930 m
Panjang bc = 1,875 m
Panjang cd = 0,937 m
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Tugas Akhir
Pe re nc a na a n Struktur Ba ng una n Se ko la ha n 2 La nta i
BAB 3 Perencanaan Atap
a b
c d
e f
g h
• Luas abgh =
⎟ ⎠
⎞ ⎜
⎝ ⎛
+ 2
bg ah
× ab =
⎟ ⎠
⎞ ⎜
⎝ ⎛
+ 2
276 ,
3 245
, 4
× 1,930 =
7,258 m
2
• Luas bcfg =
⎟ ⎠
⎞ ⎜
⎝ ⎛
+ 2
cf bg
× bc =
⎟ ⎠
⎞ ⎜
⎝ ⎛
+ 2
336 ,
2 276
, 3
× 1,875 = 5,261 m
2
• Luas cdef =
⎟ ⎠
⎞ ⎜
⎝ ⎛
+ 2
de cf
× cd =
⎟ ⎠
⎞ ⎜
⎝ ⎛
+ 2
875 ,
1 336
, 2
× 0,937 = 1,973 m
2
Gambar 3.17. Luasan Plafon Kuda-kuda Trapesium
Panjang ah = 3,750 m
Panjang bg = 3,276 m
Panjang cf = 2,336 m
commit to user
Tugas Akhir
Pe re nc a na a n Struktur Ba ng una n Se ko la ha n 2 La nta i
BAB 3 Perencanaan Atap
Panjang de = 1,875 m
Panjang ab = 0,9 m
Panjang bc = 1,8 m
Panjang cd = 0,9 m
• Luas abgh =
⎟ ⎠
⎞ ⎜
⎝ ⎛
+ 2
bg ah
× ab =
⎟ ⎠
⎞ ⎜
⎝ ⎛
+ 2
276 ,
3 750
, 3
× 0,9 =
3,162 m
2
• Luas bcfg =
⎟ ⎠
⎞ ⎜
⎝ ⎛
+ 2
cf bg
× bc =
⎟ ⎠
⎞ ⎜
⎝ ⎛
+ 2
336 ,
2 276
, 3
× 1,8 = 5,050 m
2
• Luas cdef =
⎟ ⎠
⎞ ⎜
⎝ ⎛
+ 2
de cf
× cd =
⎟ ⎠
⎞ ⎜
⎝ ⎛
+ 2
875 ,
1 336
, 2
× 0,9 = 1,895 m
2
3.6.3. Perhitungan Pembebanan Kuda-kuda Trapesium
Data-data pembebanan : Berat gording
= 29,4 kgm Berat penutup atap
= 50 kgm
2
Berat profil = 25 kgm
commit to user
Tugas Akhir
Pe re nc a na a n Struktur Ba ng una n Se ko la ha n 2 La nta i
BAB 3 Perencanaan Atap
9 10
11 12
13 14
15 16
1 2
3 4
5 6
7 8
29 28
27 26
25 24
23 22
21 20
19 18
17 P1
P2 P3
P4 P5
P6 P7
P8 P9
P16 P15
P14 P13
P12 P11
P10
Gambar 3.18. Pembebanan Kuda-kuda Trapesium akibat Beban Mati a. Beban Mati
1 Beban P1 = P9
a Beban gording
= Berat profil gording × Panjang Gording
= 29,4 × 3,75 = 110,25 kg b
Beban atap = Luasan × Berat atap
= 7,258 × 50 = 362,9 kg c
Beban plafon =
Luasan × berat plafon = 3,291 × 18 = 67,5 kg
d Beban kuda-kuda
= ½ × Btg 1 + 9 × berat profil kuda kuda = ½ × 1,875 + 2,165 × 25
= 50,5 kg e
Beban plat sambung = 30 × beban kuda-kuda
= 30 × 50,5 = 15,15 kg
f Beban bracing
= 10 × beban kuda-kuda
= 10 × 50,5 = 5,05 kg
2 Beban P2 = P8
a Beban gording
= Berat profil gording × Panjang Gording
= 29,4 × 2,820 = 82,908 kg b
Beban atap = Luasan × Berat atap
= 5,261 × 50 = 263,05 kg c
Beban kuda-kuda = ½ × Btg 9+17+18+10 × berat profil kuda kuda
= ½ × 2,165 + 1,083 + 2,165 + 2,165 × 25
commit to user
Tugas Akhir
Pe re nc a na a n Struktur Ba ng una n Se ko la ha n 2 La nta i
BAB 3 Perencanaan Atap
