commit to user 29
Tugas Akhir
Perencanaan Struktur Gedung Perpustakaan 2 Lantai
Bab 3 Perencanaan Atap
Panjang ii’ = i’k = 0,468 m
·
Luas bb’rqc’c = ½ bb’ + cc’ 7-8 + ½ b’r + c’q 7-8
= ½ 1,875 + 1,406 0,9 + ½ 3,741 + 3,272 0,9 = 4,632 m
2
·
Luas cc’qoe’e = ½ cc’ + ee’ 5-7 + ½ c’q + e’o 5-7
= ½ 1,406+0,468 2 .0,9 + ½ 3,272 +2,3432 .0,9 = 6,740 m
2
·
Luas ee’omg’gff’ = ½ 4-5 . ee’ + ½ e’o + g’m 3-5 + ½ ff’ + gg’ 3-5
=½×0,9×0,468+½2,343+1,4060,9 +½1,875+1,4060,9
= 3,374 m
2
·
Luas gg’mki’i = ½ gg’ + ii’ 1-3 × 2
= ½ 1,406+0,468 2 . 0,9 × 2 = 3,373 m
2
·
Luas jii’k = ½ × ii’ × j1 × 2
= ½ × 0,468 × 0,9 × 2 = 0,421 m
2
3.3.3. Perhitungan Pembebanan Jurai
Data-data pembebanan : Berat gording
= 11 kgm Berat penutup atap
= 50 kgm
2
Berat plafon dan penggantung = 18 kgm
2
Berat profil kuda-kuda = 25 kgm
commit to user 30
Tugas Akhir
Perencanaan Struktur Gedung Perpustakaan 2 Lantai
Bab 3 Perencanaan Atap
1 2
3 4
15 13
12 11
10 9
5 6
7 8
14 P1
P2 P3
P4 P5
P9 P8
P7 P6
Gambar 3.5. Pembebanan jurai akibat beban mati
a. Beban Mati
1 Beban P1
a Beban Gording
= berat profil gording × panjang gording bb’r = 11 × 1,875+3,741 = 64,776 kg
b Beban Atap
= luasan aa’sqc’c × berat atap = 12,239 × 50 = 611,95 kg
c Beban Plafon
= luasan bb’rqc’c’ × berat plafon = 4,632 × 18 = 83,376 kg
d Beban Kuda-kuda
= ½ × btg 1 + 5 × berat profil kuda-kuda = ½ × 2,652 + 2,864 × 25
= 68,95 kg e
Beban Plat Sambung = 30 × beban kuda-kuda = 30 × 68,95 = 20,685 kg
f Beban Bracing
= 10 × beban kuda-kuda = 10 × 68,95 = 6,895 kg
2 Beban P2
a Beban Gording
= berat profil gording × panjang gording dd’p = 11 × 0,937+2,812 = 28,983 kg
commit to user 31
Tugas Akhir
Perencanaan Struktur Gedung Perpustakaan 2 Lantai
Bab 3 Perencanaan Atap
b Beban Atap
= luasan cc’qoe’e × berat atap = 8,101× 50 = 405,05 kg
c Beban Kuda-kuda
= ½ × btg 5 + 9 + 10 + 6 × berat profil kuda-kuda = ½ × 2,864 + 1,083 + 2,864 + 2,864 × 25
= 120,937 kg d
Beban Plat Sambung = 30 × beban kuda-kuda = 30 × 120,937 = 36,281 kg
e Beban Bracing
= 10 × beban kuda-kuda = 10 × 120,937 = 12,094 kg
3 Beban P3
a Beban Gording
= berat profil gording × panjang gording ff’n = 11 × 1,875+1,875 = 41,25 kg
b Beban Atap
= luasan ee’omg’gff’ × berat atap = 4,042 × 50 = 202,1 kg
c Beban Kuda-kuda
= ½ × btg 6 + 11 + 12 + 7 × berat profil kuda-kuda = ½ × 2,864 + 2,165 + 3,423 + 2,864 × 25
= 146,963 kg d
Beban Plat Sambung = 30 × beban kuda-kuda = 30 × 146,963 = 47,089 kg
e Beban Bracing
= 10 × beban kuda-kuda = 10 × 146,963 = 15,696 kg
4 Beban P4
a Beban Gording
= berat profil gording × panjang gording hh’l = 11 × 0,937+0,937 = 20,614 kg
b Beban Atap
= luasan gg’mki’i × berat atap = 2,018 × 50 = 100,9 kg
c Beban Kuda-kuda
= ½ × btg 7 + 13 + 15 + 8 × berat profil kuda-kuda = ½ × 2,864 + 3,226 + 4,193 + 2,864 × 25
= 164,338 kg
commit to user 32
Tugas Akhir
Perencanaan Struktur Gedung Perpustakaan 2 Lantai
Bab 3 Perencanaan Atap
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