BAJA_2
4
01 A__ BALOK BRACE PROFIL IWF 350-175-11-7 12 0.2 1 KOLOM BAJA PROFIL IWF 350-175-11-7, dan IWF 300-150-9-6,5 GORDING PROFIL KANAL (C) 150-65-20 (t = 2,3 mm) ATAP SPANDEK t = 0,4 mm KOLOM BETON ( 40 X 40 ) cm B__ Beban pada Gording (bekerja pada kemiringan atap sepanjang jarak gording = 1 m) BEBAN-BEBAN Beban Atap (q spandek x 1 m) q = kg/m 1 . Berat Gording q = kg/m 1 . Beban Angin ekstrim q = kg/m 1 . Beban Hujan ( atap < 20°) q = 40–0,8 = kg/m 1 . Beban Hidup Bekerja pada 1/2 panjang gording P = kg Asumsi: Balok gording sebagai balok sederhana q y = q cos q x = q cos = 12.1 ° 1) BEBAN MATI Berat atap = kg/m 1 Berat gording = kg/m 1 q = kg/m 1 Mmax = 1/8 q L 2 Mmax (xx) = 1/8 ( qy ) ( 6 ) 2 = kg m Mmax (yy) = 1/8 ( qx ) ( 6 ) 2 = kg m STRUKTUR BAJA II - CONTOH PERHITUNGAN KERANGKA ATAP 9.90 5.00 5.50 10.50 46.20 5.00 40.00 30.32 5.50 100.00 DATA BAHAN PERHITUNGAN GORDING 6,0 m q qx qy IWF 350,175,11,7 2,0 m 2,0 m 3,0 m 4,57 m simetris 12,0 m 2,0 m 2,0 m IWF 300,150,9,6,5 Gording 150,65,20 (t=2,3 mm) Atap Spandek (t=0,4 mm) Kolom Beton (40x40) cm
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01
A__BALOK BRACE PROFIL IWF 350-175-11-7 12 0.2 1KOLOM BAJA PROFIL IWF 350-175-11-7, dan IWF 300-150-9-6,5GORDING PROFIL KANAL (C) 150-65-20 (t = 2,3 mm)ATAP SPANDEK t = 0,4 mmKOLOM BETON ( 40 X 40 ) cm
B__Beban pada Gording (bekerja pada kemiringan atap sepanjang jarak gording = 1 m)
BEBAN-BEBAN
Beban Atap (q spandek x 1 m) q = kg/m1
. Berat Gording q = kg/m1
. Beban Angin ekstrim q = kg/m1
. Beban Hujan ( atap < 20) q = 400,8 = kg/m1
. Beban Hidup
Bekerja pada 1/2 panjang gording P = kg
Asumsi:
Balok gording sebagai balok sederhana
q y = q cos
q x = q cos
= 12.1
1) BEBAN MATI Berat atap = kg/m1
Berat gording = kg/m1
q = kg/m1
Mmax = 1/8 q L2
Mmax (xx) = 1/8 ( qy ) ( 6 )2 = kg m
Mmax (yy) = 1/8 ( qx ) ( 6 )2 = kg m
STRUKTUR BAJA II - CONTOH PERHITUNGAN KERANGKA ATAP
9.90
5.00
5.50
10.50
46.20
5.00
40.00
30.32
5.50
100.00
DATA BAHAN
PERHITUNGAN GORDING
6,0 m
q
qx
qy
12,0 m2,0 m2,0 m
Kolom Beton(40x40) cm
q = 100 kg/m
PL = 80 kg
PL = 80 kg PL = 80 kg
PL = 80 kg
12,0 m
q = 32,0 kg/m
q = 30,32 kg/m
IWF 350,175,11,7
12,0 m2,0 m2,0 m
Kolom Beton(40x40) cm
q = 100 kg/m
PL = 80 kg
PL = 80 kg PL = 80 kg
PL = 80 kg
12,0 m
q = 30,32 kg/m
q = 48,0 kg/m q = 16,0 kg/m
IWF 350,175,11,7
12,0 m2,0 m2,0 m
Kolom Beton(40x40) cm
q = 100 kg/m
PL = 80 kg
PL = 80 kg PL = 80 kg
PL = 80 kg
12,0 m
q = 32,0 kg/m
IWF 350,175,11,7
12,0 m2,0 m2,0 m
Kolom Beton(40x40) cm
q = 100 kg/m
PL = 80 kg
PL = 80 kg PL = 80 kg
PL = 80 kg
12,0 m
q = 48,0 kg/m q = 16,0 kg/m
IWF 350,175,11,7
12,0 m2,0 m2,0 m
Kolom Beton(40x40) cm
q = 100 kg/m
PL = 80 kg
PL = 80 kg PL = 80 kg
PL = 80 kg
12,0 m
q = 30,32 kg/m
IWF 350,175,11,7
12,0 m2,0 m2,0 m
Kolom Beton(40x40) cm
q = 100 kg/m
12,0 m
P = 100 kg
P = 100 kg
P = 100 kg
P = 100 kgPL = 80 kg
P = 100 kgPL = 80 kg
P = 100 kgPL = 80 kg
P = 100 kgPL = 80 kg
IWF 350,175,11,7
12,0 m2,0 m2,0 m
Kolom Beton(40x40) cm
q = 100 kg/m
PL = 80 kg
PL = 80 kg PL = 80 kg
PL = 80 kg
12,0 m
IWF 350,175,11,7
4,0 m
6,0 m
6,0 m
6,0 m
12,0 m
12,0 m
4,0 m
max
5,22 cm
6,0 m
6,0 m
130
70
30
20
150
A
A
B B150
V
M
IWF 350,175,11,7
2,0 m
2,0 m
3,0 m
4,57 m
simetris
12,0 m2,0 m2,0 m
IWF 300,150,9,6,5
Gording 150,65,20 (t=2,3 mm)
Atap Spandek (t=0,4 mm)
Kolom Beton(40x40) cm
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02
2) BEBAN HUJAN q = kg/m1
Mmax (xx) = 1/8 ( qy ) ( 6 )2 = kg m
Mmax (yy) = 1/8 ( qx ) ( 6 )2 = kg m
3) BEBAN HIDUP P = kgMmax (xx) = 1/4 Py (6) = kg m
Mmax (yy) = 1/4 Px (6) = kg m
4) BEBAN ANGIN
Dari 'Peraturan Pembebanan untuk Gedung - 1983. hl.25.Beban angin dari satu jurusan, atap pelana biasa tanpa dinding harus direncanakan menurut keadaan yang paling berbahaya diantara 2 cara (I dan II), dengan koefisien angin sbb:
I. 0 20
> 30
II. = 0
10 20
= 30
> 30
Dengan asumsi arah angin dari kiri, diperoleh:Cara-I Cara-IIBidang Atap Koef Bidang Atap KoefAtap kiri (hisap) 1.2 Atap kiri (tekan) 0.8Atap kanan (hisap) 0.4 Atap kanan 0.0
Tekanan angin ekstrim, q = 40 kg/m2
Beban angin (diambil koef maksimum):
Hisap w1 = q (jrk.gording) (1,2) = Kg/m1
Tekan w2 = q (jrk.gording) (0,8) = Kg/m1
Angin Hisap
Mmax (xx) = 1/8 ( qy ) ( 6 )2 = kg m
Mmax (yy) = 1/8 ( qx ) ( 6 )2 = kg m
Angin Tekan
Mmax (xx) = 1/8 ( qy ) ( 6 )2 = kg m
Mmax (yy) = 1/8 ( qx ) ( 6 )2 = kg m
Data Gording Profil Kanal, C 150 x 65 x 20 (t = 2,3 mm)
Unit weight = kg/m1 Bisa menggunakan
Ix = cm4 C 150 x 50 x 20 (t=2,3 mm)
Iy = cm4 dengan syarat pada tengah
wx = cm3 bentang gording diberikan
wy = cm3 batang tarik.
32.00
-211.21
0.00
140.80
0.00
5.5
248
41
33
9.4
31.43
Kemiringan atapdipihak lain
Bidang atapdipihak angin
28.59
133.43
30.32
100.00146.67
-48.00
0.4
0.8
0.4
0.0
0.4
(0.4 /300)
1.2
0.8
1.2
0.8
0.8
0.5
6,0 m
q
qx
qy
12,0 m2,0 m2,0 m
Kolom Beton(40x40) cm
q = 100 kg/m
PL = 80 kg
PL = 80 kg PL = 80 kg
PL = 80 kg
12,0 m
q = 32,0 kg/m
q = 30,32 kg/m
IWF 350,175,11,7
12,0 m2,0 m2,0 m
Kolom Beton(40x40) cm
q = 100 kg/m
PL = 80 kg
PL = 80 kg PL = 80 kg
PL = 80 kg
12,0 m
q = 30,32 kg/m
q = 48,0 kg/m q = 16,0 kg/m
IWF 350,175,11,7
12,0 m2,0 m2,0 m
Kolom Beton(40x40) cm
q = 100 kg/m
PL = 80 kg
PL = 80 kg PL = 80 kg
PL = 80 kg
12,0 m
q = 32,0 kg/m
IWF 350,175,11,7
12,0 m2,0 m2,0 m
Kolom Beton(40x40) cm
q = 100 kg/m
PL = 80 kg
PL = 80 kg PL = 80 kg
PL = 80 kg
12,0 m
q = 48,0 kg/m q = 16,0 kg/m
IWF 350,175,11,7
12,0 m2,0 m2,0 m
Kolom Beton(40x40) cm
q = 100 kg/m
PL = 80 kg
PL = 80 kg PL = 80 kg
PL = 80 kg
12,0 m
q = 30,32 kg/m
IWF 350,175,11,7
12,0 m2,0 m2,0 m
Kolom Beton(40x40) cm
q = 100 kg/m
12,0 m
P = 100 kg
P = 100 kg
P = 100 kg
P = 100 kgPL = 80 kg
P = 100 kgPL = 80 kg
P = 100 kgPL = 80 kg
P = 100 kgPL = 80 kg
IWF 350,175,11,7
12,0 m2,0 m2,0 m
Kolom Beton(40x40) cm
q = 100 kg/m
PL = 80 kg
PL = 80 kg PL = 80 kg
PL = 80 kg
12,0 m
IWF 350,175,11,7
4,0 m
6,0 m
6,0 m
6,0 m
12,0 m
12,0 m
4,0 m
max
5,22 cm
6,0 m
6,0 m
130
70
30
20
150
A
A
B B150
V
M
IWF 350,175,11,7
2,0 m
2,0 m
3,0 m
4,57 m
simetris
12,0 m2,0 m2,0 m
IWF 300,150,9,6,5
Gording 150,65,20 (t=2,3 mm)
Atap Spandek (t=0,4 mm)
Kolom Beton(40x40) cm
-
03
PERIKSA TEGANGAN GORDING
(1) Beban Mati
(2) Beban Hujan
(3) Beban Hidup
(4) Beban Angin, Hisap 4H
Tekan 4T
Kombinasi (1) + (2)
(1) + (3)
(1) + (4H)
(1) + (4T)
M a k s i m u m
Diambil yang maksimum:
Mmaks_X = kgm = kg cm
Mmaks_Y = kgm = kg cm
x = Mmaks_X/wx = kg/cm2
y = Mmaks_Y/wy = kg/cm2 ###
_izin = Fy/FS = 2400/1,5 = 1600 kg/cm2 (Baja BJ-37)
maks_ytd ( x + y) = kg/cm2 _izin = 1600 kg/cm
2 ( )
KONTROL LENDUTAN GORDING
Untuk balok-balok miring pedoman batas lendutan berlaku untuk
tegak lurus sumbu kuat (Sumbu x), kecuali bila ada ketentuan lain (PPBBI-83)
Persamaan lendutan:
Untuk beban merata (q) Untuk beban terpusat (P) Ix = 248 cm4
= 5/384 [ q . Lr4 / (E.I) ] = 1/48 [ P . Lr3 / (E.I) ] Iy = 41 cm4 ###
Lr : jarak rangka = 6.0 m
E : elastisitas baja = 2E+06 kg/cm2
(1) Beban Mati (2) Beban Hujan
q kg/m' q kg/m'
x cm x cm
y cm y cm
(3) Beban Hidup (4) Beban Angin
P Kg Angin Hisap Angin Tekan
x cm qw kg/m' qw kg/m'
y cm x cm x cm
y cm y cm
1.065
0
32.00
1024.1
41.33192.87
yy
179.63
100.00
-48.00
0.453
1.009
1.308
-1.597
0
584.5
439.7
10.500 30.324
0.887
0.002
0.349
192.9
41.3
19287
4133
Kombinasi BebanMmaks (kg m)
9.90
28.59
31.43
0.00
0.00
187.00 9.90
38.49
192.87 41.33
-165.00 9.90
xx
46.20
133.43
146.67
-211.21
140.80
6,0 m
q
qx
qy
12,0 m2,0 m2,0 m
Kolom Beton(40x40) cm
q = 100 kg/m
PL = 80 kg
PL = 80 kg PL = 80 kg
PL = 80 kg
12,0 m
q = 32,0 kg/m
q = 30,32 kg/m
IWF 350,175,11,7
12,0 m2,0 m2,0 m
Kolom Beton(40x40) cm
q = 100 kg/m
PL = 80 kg
PL = 80 kg PL = 80 kg
PL = 80 kg
12,0 m
q = 30,32 kg/m
q = 48,0 kg/m q = 16,0 kg/m
IWF 350,175,11,7
12,0 m2,0 m2,0 m
Kolom Beton(40x40) cm
q = 100 kg/m
PL = 80 kg
PL = 80 kg PL = 80 kg
PL = 80 kg
12,0 m
q = 32,0 kg/m
IWF 350,175,11,7
12,0 m2,0 m2,0 m
Kolom Beton(40x40) cm
q = 100 kg/m
PL = 80 kg
PL = 80 kg PL = 80 kg
PL = 80 kg
12,0 m
q = 48,0 kg/m q = 16,0 kg/m
IWF 350,175,11,7
12,0 m2,0 m2,0 m
Kolom Beton(40x40) cm
q = 100 kg/m
PL = 80 kg
PL = 80 kg PL = 80 kg
PL = 80 kg
12,0 m
q = 30,32 kg/m
IWF 350,175,11,7
12,0 m2,0 m2,0 m
Kolom Beton(40x40) cm
q = 100 kg/m
12,0 m
P = 100 kg
P = 100 kg
P = 100 kg
P = 100 kgPL = 80 kg
P = 100 kgPL = 80 kg
P = 100 kgPL = 80 kg
P = 100 kgPL = 80 kg
IWF 350,175,11,7
12,0 m2,0 m2,0 m
Kolom Beton(40x40) cm
q = 100 kg/m
PL = 80 kg
PL = 80 kg PL = 80 kg
PL = 80 kg
12,0 m
IWF 350,175,11,7
4,0 m
6,0 m
6,0 m
6,0 m
12,0 m
12,0 m
4,0 m
max
5,22 cm
6,0 m
6,0 m
130
70
30
20
150
A
A
B B150
V
M
IWF 350,175,11,7
2,0 m
2,0 m
3,0 m
4,57 m
simetris
12,0 m2,0 m2,0 m
IWF 300,150,9,6,5
Gording 150,65,20 (t=2,3 mm)
Atap Spandek (t=0,4 mm)
Kolom Beton(40x40) cm
-
04
LENDUTAN GORDING
(1) Beban Mati
(2) Beban Hujan
(3) Beban Hidup
(4) Beban Angin, Hisap 4H
Tekan 4T
Kombinasi (1) + (2)
(1) + (3)
(1) + (4H)
(1) + (4T)
M a k s i m u m
_izin (menurut SNI 03 - 1729 - 2002)
Balok biasa L/240 = cm
Lendutan maksimum : cm cm ( )
TABEL - PROFIL KANAL
0.454
0.453
0.453
1.7601.414
1.236
-1.248
1.414
0.000
1.760
-1.597
1.358
1.065
y
0.453
1.308
0.002
x
0.349
1.009
0.887
2.223
0.000
Lendutan (cm)
G=( x+ y)Kombinasi Beban
0.572
1.651
0.887
1.597
1.065
2.223 2.500
2.223
2.500
1.459
2.169
1.636
6,0 m
q
qx
qy
12,0 m2,0 m2,0 m
Kolom Beton(40x40) cm
q = 100 kg/m
PL = 80 kg
PL = 80 kg PL = 80 kg
PL = 80 kg
12,0 m
q = 32,0 kg/m
q = 30,32 kg/m
IWF 350,175,11,7
12,0 m2,0 m2,0 m
Kolom Beton(40x40) cm
q = 100 kg/m
PL = 80 kg
PL = 80 kg PL = 80 kg
PL = 80 kg
12,0 m
q = 30,32 kg/m
q = 48,0 kg/m q = 16,0 kg/m
IWF 350,175,11,7
12,0 m2,0 m2,0 m
Kolom Beton(40x40) cm
q = 100 kg/m
PL = 80 kg
PL = 80 kg PL = 80 kg
PL = 80 kg
12,0 m
q = 32,0 kg/m
IWF 350,175,11,7
12,0 m2,0 m2,0 m
Kolom Beton(40x40) cm
q = 100 kg/m
PL = 80 kg
PL = 80 kg PL = 80 kg
PL = 80 kg
12,0 m
q = 48,0 kg/m q = 16,0 kg/m
IWF 350,175,11,7
12,0 m2,0 m2,0 m
Kolom Beton(40x40) cm
q = 100 kg/m
PL = 80 kg
PL = 80 kg PL = 80 kg
PL = 80 kg
12,0 m
q = 30,32 kg/m
IWF 350,175,11,7
12,0 m2,0 m2,0 m
Kolom Beton(40x40) cm
q = 100 kg/m
12,0 m
P = 100 kg
P = 100 kg
P = 100 kg
P = 100 kgPL = 80 kg
P = 100 kgPL = 80 kg
P = 100 kgPL = 80 kg
P = 100 kgPL = 80 kg
IWF 350,175,11,7
12,0 m2,0 m2,0 m
Kolom Beton(40x40) cm
q = 100 kg/m
PL = 80 kg
PL = 80 kg PL = 80 kg
PL = 80 kg
12,0 m
IWF 350,175,11,7
4,0 m
6,0 m
6,0 m
6,0 m
12,0 m
12,0 m
4,0 m
max
5,22 cm
6,0 m
6,0 m
130
70
30
20
150
A
A
B B150
V
M
IWF 350,175,11,7
2,0 m
2,0 m
3,0 m
4,57 m
simetris
12,0 m2,0 m2,0 m
IWF 300,150,9,6,5
Gording 150,65,20 (t=2,3 mm)
Atap Spandek (t=0,4 mm)
Kolom Beton(40x40) cm
