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contoh soal mencari luas bidang momen
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contoh soal mencari luas bidang momen
teknik sipilDeskripsi lengkap...
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Sabda Amarta Qhoir
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Soal no: 1
∑
∑
= 0
. q . L = . 4 . 6 = 12 ton =
6 RA
RB . 6
2
6 RA RA
Kontrol :
2
=
∑
RB
= 0
. q . L =
2
=
= 12 ton
= 72 – 72 – 72 72 = 0
Momen MA
= 0
M max
= RA . X -
. q . X
2
= 12 . 3 -
= RA – RA – qX
= 18 tm
= 12 – 12 – 4 4 X X= MB
=3m
= RA . 6 – 4 – 4 . = 0
. q . L
2
. 4 . 3
2
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Gaya Lintang DA1
= 0
DA2
= RA
= -12 + 12
= 12 ton
= 0
DB1
= DA2 – q – q . 6 = 12 – 12 – 24 24 = - 12 ton
Gambar diagram M .D .N
DB2
= DB1 + RB
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PERHITUNGAN LUAS dan TITIK BERAT BIDANG MOMEN
Cara INTEGRAL
Cara Pendekatan L1
= 2/3 x 3 x 18 = 36 Tm2
Titik berat L1 terhadap A = 5/8 x 3
= 1,875 m
∫ =
L1
=
L1
= 36 Tm 2
TITIK BERAT
( ) = TBLI =
= 1,875 m
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Cara pendekatan L2
= 2/3 x 3 x 18 = 36 Tm 2
Titik berat L2 terhadap A = (3/8 x 3 )+ 3 =4,125m
Cara INTEGRAL L2
L2
∫ =
=
= 36 Tm 2
TITIK BERAT L2 dari A
TB L2
( ) = = 216 – 216 – 67,5 67,5 =
= 4,125 m
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Soal no : 2
∑
= 0 = 2 . 3 – RB – RB . 6 +
RB
=
∑
=
= 13 ton
. 4 . 6
2
RB
= 13 ton
∑
= -
RA
. 4 . 6 – 2 – 2 . 3 + RA . 6 2
= 13 ton
0
= 26 – 26 – 26 26 = 0 ………….. ( ok ) Moment MA
= 0
MC
= RA . 3 -
. 4 . 3
2
= 21 tm MB
= RA . 6 -
. 4 . 6 – 2 – 2 . 3 2
2
= 0 tm Gaya Lintang DA1
= 0
DA2
= RA
DC1
= DA2 – q – q . 3
DB1
= DC2 – 4 . 3 = - 13 ton
DB2
= DB1 + RB
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Gambar diagram M. D .N
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PERHITUNGAN LUAS BIDANG MOMEN
PERHITUNGAN LUAS BIDANG MOMEN Cara integral Mx
= RA .X – P . ( X-3 ) – 4/2 .q 2
L1
=
∫ = 2
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PERHITUNGAN LUAS BIDANG MOMEN
L2
∫ = ( )
=
= 81 – 81 – 40,5 40,5 L2
= 40,5 Tm 2
TITIK BERAT L2 TERHADAP A Metode Pendekatan L2
= 2/3 x 3 x 21 = 42 Tm2
TITIK BERAT L 2 thd. A TB L1 = (3/8 x 3)+ 3 = 4,125 m
()) ∫ .TB L 1 = ∫ ( .TB L 1 = ∫ ( ( ( ) ) .TB L 1 = .TB L 1 = 252 – 252 – 171/2 171/2 .TB L 1 = 333/2 TB L 1
= 37/9 m
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Soal no 3 :
∑
= 0 =2 . 2 + 2 . 4 +
RB
=
q . L – RB. – RB. 6 2
= 14 + 14 - 28 =
0 …………… ( ok )
Moment MA
= 0
MC
= RA . 2 = 20 tm
=
= 14 ton
= 0
0
= 0 =-2 . 2 - 2 . 4 -
RB
= 14 ton
∑
∑
4.2
2
q . L + RB . 6 2
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Momen max
Mx
= RA . X – P – P1 . ( X – X – 2 2 ) -
.q.X
2
14 . 3 – 2 – 2 ( 3 – 3 – 2 2 ) -
= RA – RA – P P – – q q X
= 22 tm
= 3m Gaya Lintang DA1
= 0
DA2
= RA
DC1
= DA2 – 4 – 4 . 2
DD2
= - 6 ton DB1
= 6 ton DC2
DD1
= DC1 – 2 – 2
= DD1 – 2 – 2
= DD2 – 4 – 4 . 2 = - 14 ton
DB2
= DB1 + DB2
= - 4 ton
= - 14 – 14 – 14 14
= DC2 – 4 – 4 . 2
= 0 ton
= - 4 ton
.4.3
2
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Gambar diagram M ,D ,N
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Perhitungan Perhitung an LUAS BIDANG MOMEN
Perhitungan LUAS 1
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Perhitungan LUAS 2
L2
= 1 X 20 = 20 Tm2
Titik berat L2 terhadap A L2
=(½x1)+2 = 2,5 m
Perhitungan LUAS 3
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Perhitungan LUAS 4
L4
= 2/3 x (Mmax – (Mmax – MD MD ) = 2/3 x ( 22 -20 ) = 4/3 Tm2
Titik berat L4 terhadap A L4
= 3 + ( 3/8 x 1 ) = 3,375 m
Perhitungan LUAS 5
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Perhitungan LUAS 6 Titik berat L6 terhadap A
Metode pendekatan L6
= 2/3 x 2 x 20 =80/3 Tm2
Titik berat L6 terhadap A
∫ ∫ ( ) 68/3 TB L6 = ∫ ( ( ) ( ) ) = ∫ ) = = 288 -
/ = =
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