xxvii 13
3,117 14
2,464 15
3,751 16
3,619
3.5.2. Perhitungan luasan jurai
G
j 1
2 3
4 5
6 7
8 9
a b
c d
e g
h i
k l
m n
o p
q r
s a
i h
g f
e d
c b
f
j 1
2 3
4 5
6 7
8 9
a b
c d
e g
h i
k l
m n
o p
q r
s
a i
h g
f e
d c
b f
Gambar 3.3. Luasan Atap Jurai
Panjang j1 = ½ . 2,309 = 1,155 m
Panjang j1 = 1-2 = 2-3 = 3-4 = 4-5 = 5-6 = 6-7 = 7-8 = 8-9 = 1,155 m
Panjang aa’ = 2,500 m
Panjang a’s = 4,500 m
Panjang cc’ = 1,500 m
Panjang c’q = 3,500 m
Panjang ee’ = 0,500 m
Panjang e’o = 2,500 m
Panjang gg’ = g’m = 1,500 m Panjang ii’
= i’k = 0,500 m
a. Luas aa’sqc’c = ½ aa’ + cc’ 7-9 + ½ a’s + c’q 7-9
= ½ 2,5 + 1,5 2 . 1,155 + ½ 4,5 + 3,5 2 . 1,155
xxviii = 13,86 m
2
b.Luas cc’qoe’e = ½ cc’ + ee’ 5-7 + ½ c’q + e’o 5-7
= ½ 1,5 + 0,5 2 . 1,155 + ½ 3,5 + 2,5 2 . 1,155 = 9,24 m
2
c. Luas ee’omg’gff’ = ½ 4-5 . ee’ + ½ e’o + g’m 3-5 + ½ ff’ + gg’ 3-5
= ½×1,155×0,5 + ½ 2,5 + 1,5 2,31 + ½ 2 + 1,5 2,31 = 8,95 m
2
d.Luas gg’mki’i = ½ gg’ + ii’ 1-3 × 2
= ½ 1,5 + 0,5 2 . 1,155 × 2 = 4,62 m
2
e. Luas jii’k = ½ × ii’ × j1 × 2
= ½ × 0,5 × 1,155 × 2 = 0,578 m
2
G
j 1
2 3
4 5
6 7
8 9
a b
c d
e g
h i
k l
m n
o p
q r
s a
i h
g f
e d
c b
f
j 1
2 3
4 5
6 7
8 9
a b
c d
e g
h i
k l
m n
o p
q r
s
a i
h g
f e
d c
b f
Gambar 3.4. Luasan Plafon Jurai
Panjang j1 = ½ . 2,000 = 1 m
Panjang j1 = 1-2 = 2-3 = 3-4 = 4-5 = 5-6 = 6-7 = 7-8 = 8-9 = 1 m
Panjang bb’ = 2,000 m Panjang b’r
= 4,000 m Panjang cc’
= 1,500 m Panjang c’q
= 3,500 m
xxix Panjang ee’
= 0,500 m Panjang e’o
= 2,500 m Panjang gg’ = g’m = 1,500 m
Panjang ii’ = i’k = 0,500 m
f. Luas bb’rqc’c = ½ bb’ + cc’ 7-8 + ½ b’r + c’q 7-8
= ½ 2,0 + 1,5 1 + ½ 4 + 3,5 1 = 5,50 m
2
g.Luas cc’qoe’e = ½ cc’ + ee’ 5-7 + ½ c’q + e’o 5-7
= ½ 1,5 + 0,5 2 . 1 + ½ 3,5 + 2,5 2 . 1 = 8,50 m
2
h.Luas ee’omg’gff’ = ½ 4-5 . ee’ + ½ e’o + g’m 3-5 + ½ ff’ + gg’ 3-5
= ½ × 1 × 0,5 + ½ 2,5 + 1,5 2 + ½ 2 + 1,5 2 = 7,75 m
2
i. Luas gg’mki’i = ½ gg’ + ii’ 1-3 × 2
= ½ 1,5 + 0,5 2 . 1 × 2 = 4,00 m
2
j. Luas jii’k = ½ × ii’ × j1 × 2
= ½ × 0,5 × 1 × 2 = 0,50 m
2
3.5.3. Perhitungan Pembebanan Jurai
Data-data pembebanan : Berat gording
= 9,095 kgm Berat penutup atap
= 50 kgm
2
Berat plafon dan penggantung = 18 kgm
2
Berat profil kuda-kuda = 15 kgm
xxx
P1 P2
P3 P4
P5
P9 P8
P7 P6
P1 0 P1 1
1 2
3 11
6 7
12 13
14 8
15
4 5
9 10
16
Gambar 3.5. Pembebanan jurai akibat beban mati
1 Beban Mati
e. Beban P1
a. Beban Gording
= berat profil gording × panjang gording bb’r = 9,095 × 2,0+4,0 = 54,570 kg
b.
Beban Atap = luasan aa’sqc’c × berat atap
= 13,86 × 50 = 693 kg
c. Beban Plafon
= luasan bb’rqc’c’ × berat plafon = 5,50 × 18 = 99 kg
d. Beban Kuda-kuda
