Alternatif 1 WOODS DESIGN STRUCTURE
* SAP 2000 REPORT * JOINT DESIGN * CONTROL DESIGN
Data Perencanaan - Jarak kuda-kuda - Bentang kuda-kuda - Sudut - Penutup atap (Genteng) - Kelas kuat kayu - Kecepatan angin - Alat sambung
3 11,5 20 50 1 40 - Baut - Pen
m m derajat kg/m2 kg/m2
Berat Baja 2 x L.70.70.7 Rangka
Panjang Batang
R1 R2 R3 R4 R5
Jml Rangka
4538 2269 3016 1102 3741
7 2 4 8 2 total
2 x L.70.70.7 berat / m'
Total 31766 4538 12064 8816 7482 64666
cm cm cm cm cm cm
1293.32 m 7.38 kg/m
Berat total baja 2.L.70.70.7
9544.7016 kg
Berat Baut D 1/2' Rangka R1 R2 R3
Jml baut
Jml Rangka 164 84 88
7 2 4
Total 1148 bh 168 bh 352 bh
R4 R5
8 2 total
Jumlah total baut D 1/2'
0 bh 0 bh 1668 bh
1668 buah
FRAME
DISTANCE (m)
P (kg) Tekan (-) Tarik (+)
4-9 5 - 8 6-7 10 - 15 11 - 14 12 - 13 16 - 20 25 - 35 26 - 36 31 32
2.21 2.21 2.21 1.92 1.92 1.92 1.1 1.1 1.1 1.1 2.2
5062.55 4050.04 1697.14
29 - 37 33 -34 21 - 24 22 - 23
1.92 19.2 2.21 2.92
129.36 1814.37 912.3 532
4881.16 4382.65 3569.6 59.16 475.52 483.81 659.71 648.71
E. GORDING 08/12 E.1 Perhitungan Gording Data-data - Jarak kuda-kuda max = - Bentang kuda-kuda = - Jarak gording = - Berat penutup atap = - Berat angin = - Kemiringan kuda-kuda = Kelas kuat kayu 1/2/3/4 ? = Ukuran gording 08 /12 cm kayu kruwing Bj = 0.79 Peninjauan Searah Sumbu Y - Y 1. Bs. Gording = 0.08x0.12x0.79x1000xcos 32 M1 = 1/8 x 6.43 x 4^2 2. Bs. Atap = 2.63 x 50 x cos 32 M2 = 1/8 x 111.52 x 4^2 3. Muatan Angin W = 0.02 x 32 - 0.4 W1 = 0.24 x 2.63 x 35 M3 = 1/8 x 22.092 x 4^2 W2 = - 0.4 x 2.63 x 35 M4 = 1/8 x -36.82 x 4^2 3. Beban Berguna ( P ) M5 = 1/4 x cos 32 x 100 x 4 4. Kombinasi Muatan M1 + M2 + M3 M1 + M2 + M5 Peninjauan Searah Sumbu X - X 1. Bs Gording = 0.08x0.12x0.79x1000xsin 32 M1 = 1/8 x 4.02 x 4^2 2. Bs Atap = 2.63 x 50 x sin 32 M2 = 1/8 x 69.68 x 4^2 3. Beban Berguna ( P ) M5 = 1/4 x sin 32 x 100 x 4 4. Kombinasi Muatan M1 + M2 M1 + M2 + M5 Ix Iy Wx Wy
= = = =
1/12 x 08x12^3 1/12 x 12x08^3 1152 / (0.5 x 12) 512 / (0.5 x 08)
Kontrol Tegangan Wx = Wy = Mx = My = s
=
192 2048 20040 32070
Kesimpulan :
400 1790 263 50 35 32 3
cm cm cm kg/m2 kg/m2 derajat
= = = =
6.43 kg 12.86 kgm 111.52 kg 223.04 kgm
= = = = = = =
0.24 22.09 kg/m' 44.18 kgm -36.82 kg/m' -73.64 kgm 100.00 kg 84.80 kgm
= =
280.08 kgm 320.70 kgm
= = = = = =
4.02 kg/m' 8.04 kgm 69.68 kg/m' 139.37 kgm 100 kg 52.99 kgm
= =
147.41 kgm 200.40 kgm
=
1152 512 192 2048
= =
cm3 cm3 kgcm kgcm
- tegangan Ganti - lendutan : dipasang trestang
cm4 cm4 cm3 cm3
Kelas kuat kayu 1/2/3/4 ? 3 (ijin) 75 kg/cm2 Modulus elastis (E) 80000 kg/cm s
20,040 / 2048 + 32,070 / 192
AQ - E.6 of 17
=
176.82 kg/cm2
Kontrol Lendutan L =
> 75kg/cm2
Ganti
400 cm
f
=
1/200 x 400
=
qx qy Px Py
= = = =
6.43 + 111.52 + 22.0 4.02 + 69.68 100 x cos 32 100 x sin 32
= = = =
fx
=
5 x 14004 x 400^4 + 384 x 80000 x 1152 5.065173662 + 6.292 cm
84.8048096156426 x 400^3 48 x 80000 x 1152 1.226921
= =
5 x 0.74 x 400^4 + 384 x 80000 x 512 5.997989172 + 7.723 cm
52.99 x 400^3 48 x 80000 x 512 1.724998
= =
sqrt( 6.292^2 + 7.723^2 ) 9.96 cm
= = fy
ft
=
2 cm 140.04 73.70 84.80 52.99
kg/m' kg/m' kg/m' kg/m'
> 2 cm
dipasang trestang
E.2 Pembebanan Kuda-kuda => Joint P1 = 658.31 kg Data-data Ukuran gording 08 /12 cm kayu kruwing Bj = 0.79 - Jarak kuda-kuda max = - Jarak gording = - Berat penutup atap = - Berat Eternit = - Berat Penggantung = - L kanan = - L kiri = Beban mati 1. Bs Gording = 0.08x0.12x0.79x1000 x 4 2. Bs. Atap = 2.63 x 50 3. Bs. Kuda-kuda L = 17.9 x 4 4. Bs. Eternit = 4 x 11 5. Bs. Penggantung = 4 x 8 P1
= =
= = 17.9 m = = =
400 263 50 11 8 2.5 2
cm cm kg/m2 kg/m2 kg/m2 m m
30.34 kg 131.5 kg/m' 71.6 kg/m' 44 kg/m' 32 kg/m'
30.34 + (131.50 + 71.6 + 44 + 32) x 1/2 x (2.5 + 2) 658.31 kg
=> Joint W1 = 265.10 kg Beban angin - Berat angin - Jarak kuda-kuda max - Kemiringan kuda-kuda - Jarak gording
= = = =
AQ - E.7 of 17
35 400 32 263
kg/m2 cm derajat cm
- L kanan - L kiri
= =
W = 0.02 x 32 - 0.4 = W1 = 0.24 x 2.63 x 35 = W2 = - 0.4 x 2.63 x 35 = W = W1 = 1/2 x (2.5 + 2) x 58.91 x 4 = 265.10 kg
AQ - E.8 of 17
2.5 m 2 m 0.24 22.09 kg/m' 36.82 kg/m' 58.91 kg/m'
BEBAN TERPUSAT ATAP RANGKA KAYU Data-data Beban orang (kg) Beban penutup atap /mati (kg) Ukuran gording (b x h m) Jarak kuda-kuda (m) Jarak antar gording (m) Kemiringan atap (derajat) Tekanan angin (kg/m2) Kelas kuat kayu Tegangan izin lentur Modulus elastis (E)
100 50 0.08 x 3 2.2 30 40 3 75 80000 KG/CM2
0.15
Perhitungan
Beban mati B. mati = (orang+mati).Skuda-kuda.Sgording B. gording = (bg.hg).Skuda-kuda.1000 Ptengah = Bmati + Bgording Ppinggir = Ptengah/2
990 36 1026 513
Beban angin derajat<=65 = (0,02.sudut-0,4).Skuda-kuda.Sgording.Tangin 65<=derajat<=90 = (0,9).Skuda-kuda.Sgording.Tangin Pangintekan txt=Panginkiri.sin(derajat) tyt=Panginkiri.cos(derajat) Pangintarik=0,4.Skuda-kuda.Sgording.Tangin hxt=Panginkiri.sin(derajat) hyt=Panginkiri.cos(derajat)
52.8 237.6 52.8 26.4 45.726141 105.6 52.8 91.452283
Titik kordinat beban terpusat rangka atap beban mati (L=1) --- > Kg Psendiri pinggir = Ppinggir Psendiri tengah = Ptengah Psendiri pinggir = Ppinggir beban angin (L=2) -----> Kg Pangin tekan tumpuan (x,y) = (txt/2 , -tyt/2) Pangin tekan tengah (x , y) = (txt,-tyt) Pangin ujung (x,y) = (hxt+txt , hyt+tyt) Pangin tarik tengah (x , y) = (hxt,hyt) Pangin tarik tumpuan (x,y) = (hxt/2 , hyt/2)
0 0 0
, , ,
-513 -1026 -513
13.20 26.40 79.20 52.80 26.40
, , , , ,
-22.86 -45.73 45.73 91.45 45.73
Gambar pembebanan atap Beban sendiri atap -1026 kg
-1026 kg
alfa = 30 derajat
-1026 kg
-1026 kg
-1026"kg
Beban sendiri angin ( 79.2 , 45.7) kg
(26.4 , -45.7) kg
(26.4 , -45.7) kg
alfa = 30 derajat
(52.8 , 91.5) kg
(52.8 , 91.5) kg
TABEL PERHITUNGAN KEAMANAN KAYU (TUNGGAL) Angka keamanan Kelas kuat kayu (1/2/3/4) ?
0% 1
No. Batang
P (kg)
Lk (cm)
b (cm)
h (cm)
Jml
1
2
3
4
5
6
4-9 5-8 6-7 10 - 15 11 - 14 12 - 13 16 - 20 25 - 35 26 - 36 31 32 21 - 24 22 - 23
5062.6 4050 1697.1 4881.2 4382.7 3569.6 59.16 475.52 483.81 659.71 648.71 912.3 532
2.21 2.21 2.21 1.92 1.92 1.92 1.1 1.1 1.1 1.1 2.2 2.21 2.92
8 8 8 8 8 8 8 8 8 8 8 8 8
15 15 15 15 15 15 15 15 15 15 15 15 15
1 1 1 1 1 1 1 1 1 1 1 1 1
Fbr (cm2) 6 x (4 x 5) 7
I (cm4) 1/12 x 4 x 5^3 8
120 120 120 120 120 120 120 120 120 120 120 120 120
I (cm3) 0,289 x 5 9
2250 2250 2250 2250 2250 2250 2250 2250 2250 2250 2250 2250 2250
4.335 4.335 4.335 4.335 4.335 4.335 4.335 4.335 4.335 4.335 4.335 4.335 4.335
lamda 3/9 10
Wtabel 11
0.509803922 0.509803922 0.509803922 0.442906574 0.442906574 0.442906574 0.253748558 0.253748558 0.253748558 0.253748558 0.507497116 0.509803922 0.673587082
1 1 1 1 1 1 1 1 1 1 1 1 1
tegpakai < 2 x 11 / 7 12
tegijin
Ket
13
14
42.187917 33.750333 14.142833 40.676333 36.522083 29.746667 0.493 3.9626667 4.03175 5.4975833 5.4059167 7.6025 4.4333333
130 130 130 130 130 130 130 130 130 130 130 130 130
1 x 8 x 15 aman 1 x 8 x 15 aman 1 x 8 x 15 aman 1 x 8 x 15 aman 1 x 8 x 15 aman 1 x 8 x 15 aman 1 x 8 x 15 aman 1 x 8 x 15 aman 1 x 8 x 15 aman 1 x 8 x 15 aman 1 x 8 x 15 aman 1 x 8 x 15 aman 1 x 8 x 15 aman
TABEL PERHITUNGAN KEAMANAN KAYU (GANDA) Angka keamanan KELAS KUAT KAYU(1/2/3/4) ?
No. Batang
29 - 37 33 - 34
Catatan :
P (kg)
Lk (cm)
0% 1
Kayu Pinggir(cm) bp hp
129.36 1814
1.92 19.2
(*)
iy < imin ----> iy > imin ---->
8 8
12 12
iy imin
Kayu Tengah(cm) bt ht
8 8
15 15
It =2.(1/12).bp^3.hp+ 2.bp.hp((bt+bp)/2)^2
13312 13312
Ig
Iy
iy
1/12.(2bt)^3.h 1/4(It+3.Ig) sqrt(Iy/(2.bp.hp))
4096 4096
6400 6400
5.773502692 5.773502692
imin
ipakai *
0,289.hp iy
3.468 3.468
lamda Lk/ipakai
3.468 0.55363 3.468 5.53633
Wtabel tegpakai <
1 1.03
0.6738 9.7314
tegijin
130 126
TABEL PERHITUNGAN KEAMANAN KAYU (GANDA) Angka keamanan KELAS KUAT KAYU(1/2/3/4) ?
No. Batang
29 - 37 33 - 34
Catatan :
P (kg)
Lk (cm)
0% 1
Kayu Pinggir(cm) bp hp
129.36 1814
1.92 19.2
8 8
(*)
iy < imin ----> iy > imin ---->
Kayu Tengah(cm) bt ht
12 12
8 8
Ig
It =2.(1/12).bp^3.hp+ 2.bp.hp((bt+bp)/2)^2
15 15
Iy
iy
1/12.(2bt)^3.h 1/4(It+3.Ig) sqrt(Iy/(2.bp.hp))
13312 13312
4096 4096
6400 6400
5.773502692 5.773502692
imin
3.468 3.468
iy imin
SAMBUNGAN BAUT DAN PLAT Titik Tumpu No. 9/18 batang 29 Gol = (cm) = P1 = P2 = P2 = Ps =
--->
1 30 1.9
Tampang b (cm) = Jumlah baut
2 8 1
129.36 kg plat (y/t)
1,330.00 kg > 129.36 kg
1
Tampang
tekan t
f3 /4"
buah
125 x 8 x 1.9 x ( 1 - 0,6.Sin(30)) 250 x 8 x 1.9 x ( 1 - 0,6.Sin(30)) 480 x 1.9 x 1.9 x ( 1 - 0,35.Sin(30)) diambil terkecil 1 x 1,330.00
Titik Tumpu No. 14 batang 25 Gol
P=
Ps
= = = = =
1330 2660 1429.56 1330 1330
(aman) P= 1
475.52 kg plat (y/t)
tarik y
ipakai *
0,289.hp iy
kg kg kg kg kg
lamda Lk/ipakai
3.468 0.55363 3.468 5.53633
Wtabel tegpakai <
1 1.03
0.6738 9.7314
tegijin
130 126
SAMBUNGAN BAUT DAN PLAT Titik Tumpu No. 9/18 batang 29 Gol = (cm) = P1 = P2 = P2 = Ps =
--->
1 30 1.9
Tampang b (cm) = Jumlah baut
P1 = P2 = P2 = Ps = Pp = --->
2 8 1
129.36 kg plat (y/t)
1,330.00 kg > 129.36 kg
1 90 1.9
Tampang b (cm) = Jumlah baut
P= 1 8 2
475.52 kg plat (y/t) buah
diambil terkecil 2 x 304.00 2 x 1,25 x 304.00
P1 = P2 = P2 = Ps = Pp = --->
1 8 2
P1 = P2 = P2 = Ps =
--->
304 563.16 0 304 608 760
kg kg kg kg kg kg
tarik y
= = = = = =
365.092 kg 603.786 kg 0 kg 365.09 kg 730.18 kg 912.731 kg
(aman) 1814.37 kg 2 8 2
plat (y/t)
tekan t
f3 /4"
buah
125 x 8 x 1.9 x ( 1 - 0,6.Sin(30)) 250 x 8 x 1.9 x ( 1 - 0,6.Sin(30)) 480 x 1.9 x 1.9 x ( 1 - 0,35.Sin(30)) diambil terkecil 2 x 1,330.00
Titik Tumpu No. 15 batang 32
= = = = = =
f3 /4"
buah
Ps
912.73 kg > 483.81 kg
2,660.00 kg > 1814.37 kg
y
plat (y/t)
diambil terkecil 2 x 365.09 2 x 1,25 x 365.09
Tampang b (cm) = Jumlah baut
tarik
483.81 kg
50 x 8 x 1.9 x ( 1 - 0,6.Sin(60)) 240 x 1.9 x 1.9 x ( 1 - 0,35.Sin(60))
1 30 1.9
kg kg kg kg kg
(aman)
Titik Tumpu No. 10 batang 33 Gol = (cm) =
1330 2660 1429.56 1330 1330
f3 /4"
Ps
760.00 kg > 475.52 kg
Tampang b (cm) = Jumlah baut
= = = = =
Ps
50 x 8 x 1.9 x ( 1 - 0,6.Sin(90)) 240 x 1.9 x 1.9 x ( 1 - 0,35.Sin(90))
1 60 1.9
t
(aman)
Titik Tumpu No. 10 batang 26 Gol = (cm) =
tekan
f3 /4"
buah
125 x 8 x 1.9 x ( 1 - 0,6.Sin(30)) 250 x 8 x 1.9 x ( 1 - 0,6.Sin(30)) 480 x 1.9 x 1.9 x ( 1 - 0,35.Sin(30)) diambil terkecil 1 x 1,330.00
Titik Tumpu No. 14 batang 25 Gol = (cm) =
P=
Ps
= = = = =
1330 2660 1429.56 1330 2660
(aman) 648.71 kg
tarik
kg kg kg kg kg
Gol = (cm) = P1 = P2 = P2 = Ps = Pp = --->
1 90 1.9
Tampang b (cm) = Jumlah baut
P1 = P2 = P2 = Ps =
--->
P1 = P2 = P2 = Ps =
--->
1 0 1.9
Tampang b (cm) = Jumlah baut
P1 = P2 = P2 = Ps =
--->
P= 2 8 4
6,931.20 kg > 4050.04 kg
1 0 1.9
Tampang b (cm) = Jumlah baut
4050.04 kg plat (y/t)
P= 2 8 4
tekan t
= = = = =
Ps
1900 kg 3800 kg 1732.8 k g 1732.8 kg 6931.2 kg
4382.65 kg plat (y/t)
tarik t
f3 /4"
buah
= = = = =
Ps
1900 kg 3800 kg 1732.8 k g 1732.8 kg 6931.2 kg
(aman) P= 2 8 4
125 x 8 x 1.9 x ( 1 - 0,6.Sin(0)) 250 x 8 x 1.9 x ( 1 - 0,6.Sin(0)) 480 x 1.9 x 1.9 x ( 1 - 0,35.Sin(0)) diambil terkecil 4 x 1,732.80
6,931.20 kg > 4881.16 kg
kg kg kg kg kg kg
(aman)
6,931.20 kg > 4382.65 kg
Tampang b (cm) = Jumlah baut
304 563.16 0 304 608 760
f3 /4"
buah
125 x 8 x 1.9 x ( 1 - 0,6.Sin(0)) 250 x 8 x 1.9 x ( 1 - 0,6.Sin(0)) 480 x 1.9 x 1.9 x ( 1 - 0,35.Sin(0)) diambil terkecil 4 x 1,732.80
1 0 1.9
= = = = = =
(aman)
125 x 8 x 1.9 x ( 1 - 0,6.Sin(0)) 250 x 8 x 1.9 x ( 1 - 0,6.Sin(0)) 480 x 1.9 x 1.9 x ( 1 - 0,35.Sin(0)) diambil terkecil 4 x 1,732.80
Samb. Kolom dgn kuda-kuda Gol = (cm) =
Ps
760.00 kg > 648.71 kg
y f3 /4"
buah
diambil terkecil 2 x 304.00 2 x 1,25 x 304.00
Sambungan Titik Tumpu 14 Gol = (cm) =
plat (y/t)
50 x 8 x 1.9 x ( 1 - 0,6.Sin(90)) 240 x 1.9 x 1.9 x ( 1 - 0,35.Sin(90))
Sambungan Batang No. 5 Gol = (cm) =
1 8 2
4881.16 kg plat (y/t)
tarik t
f3 /4"
buah
Ps
(aman)
= = = = =
1900 kg 3800 kg 1732.8 k g 1732.8 kg 6931.2 kg
SAMBUNGAN GIGI Titik Tumpu No. 1 batang 4 V (cm)
38.5
Kls kayu (1-4) Gigi (1/2)
1 2
d' = 1/6 x 15 d'' = 1/4 x 15 d = 2.5 + 3.75
= = =
h=
s
=
t
30 s t
ijin // ijin //
P (kg)
130 b (cm) = 20 h (cm) =
5062.55
tekan
8 15
2.5 cm 3.75 cm 6.25 cm
(5062.55 x cos 30) 8 x 6.25 (5062.55 x cos 30) 38.5 x 8
=
87.69 kg/cm2
< 130 kg/cm2 (aman)
=
14.23 kg/cm2
< 20 kg/cm2 (aman)
Titik Tumpu No. 9/13 batang 16 V (cm)
221
60 ijin // ijin //
Kls kayu (1-4) Gigi (1/2)
1 1
d' = 1/6 x 15
=
2.5 cm
d
=
2.5
h=
s
=
t
s t
(59.16 x cos 60) 8 x 2.5 (59.16 x cos 60) 221 x 8
P (kg)
130 b (cm) = 20 h (cm) =
59.16
tekan
8 15
cm =
1.48 kg/cm2
< 130 kg/cm2 (aman)
=
0.02 kg/cm2
< 20 kg/cm2 (aman)
Titik Tumpu No. 9 batang 21 V (cm)
10
Kls kayu (1-4) Gigi (1/2)
1 1
d' = 1/6 x 15
=
2.5 cm
d
=
2.5
h=
s
=
t
(912.3 x cos 60) 8 x 2.5 (912.3 x cos 60) 10 x 8
Titik Tumpu No. 14 batang 21
60 s t
ijin // ijin //
P (kg)
130 b (cm) = 20 h (cm) =
912.3
tekan
8 15
cm =
22.81 kg/cm2
< 130 kg/cm2 (aman)
=
5.70 kg/cm2
< 20 kg/cm2 (aman)
V (cm)
10
Kls kayu (1-4) Gigi (1/2)
1 1
d' = 1/6 x 15
=
2.5 cm
d
=
2.5
h=
s
=
t
60 s t
ijin // ijin //
(912.3 x cos 60) 8 x 2.5 (912.3 x cos 60) 10 x 8
P (kg)
130 b (cm) = 20 h (cm) =
912.3
tekan
8 15
cm =
22.81 kg/cm2
< 130 kg/cm2 (aman)
=
5.70 kg/cm2
< 20 kg/cm2 (aman)
Titik Tumpu No. 10 batang 22 V (cm)
221
101 ijin // ijin //
P (kg)
532
130 b (cm) = 20 h (cm) =
8 15
Kls kayu (1-4) Gigi (1/2)
1 1
d' = 1/6 x 15
=
2.5 cm
d
=
2.5
h=
s
=
t
s t
(532 x cos 101) 8 x 2.5 (532 x cos 101) 221 x 8
tekan
cm =
-5.08 kg/cm2
< 130 kg/cm2 (aman)
=
-0.06 kg/cm2
< 20 kg/cm2 (aman)
Titik Tumpu No. 15 batang 22 V (cm)
10
Kls kayu (1-4) Gigi (1/2)
1 1
d' = 1/6 x 15
=
2.5 cm
d
=
2.5
h=
s
=
t
(532 x cos 41) 8 x 2.5 (532 x cos 41) 10 x 8
41 s t
ijin // ijin //
P (kg)
532
130 b (cm) = 20 h (cm) =
8 15
tekan
cm =
20.08 kg/cm2
< 130 kg/cm2 (aman)
=
5.02 kg/cm2
< 20 kg/cm2 (aman)
KONTROL BERAT SENDIRI 1 KUDA-KUDA No. Batang
Tampang ( 1/2)
3 4 5 6 7 8 15 14 13 12 11 10 9 25 24 26 27 28 29 19 20 21 22 23 1 2 16 17
1 1 1 1 1 2 1 1 1 1 1 1 3 1 1 1 1 1 1 3 2 2 2 2 1 1 1 1
l
Ukuran (cm) b
h
203 203 203 203 203 203 192 192 192 192 192 192 67 67 67 67 67 67 67 67 192 192 192 192 203 117 233 203
20 8 8 8 8 20 20 8 8 8 8 20 20 8 8 8 8 8 8 20 6 6 6 6 8 8 8 8
15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15
Volume Keterangan (cm3) 60900 24360 24360 24360 24360 60900 57600 23040 23040 23040 23040 57600 20100 8040 8040 8040 8040 8040 8040 20100 17280 17280 17280 17280 24360 14040 27960 24360 674880
Total Volume = 674880 x 0.000001 = 0.67488 m3 Bj Kayu Kruwing rata-rata = 0.75 Berat sendiri = 674880 x 0.75 = 506160 gram
gram/cm3 = 506.16 kg
