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APLIKASI MKKS PADA BALOK STATIS TIDAK TENTU
• PROSEDURE PERHITUNGAN
1. TENTUKAN DERAJAT KEBEBASAN STRUKTUR
DOF = 3
2. TETAPKAN PARAMETER STRUKTUR
A. STRUKTUR DASAR YANG DIKEKANG
D2
D1 D3
B. Hubungan D dengan d
d1
d2
d5 d6
d3
d4
D1 D2
D3
[d] = [ A]{D}
Diberikan D2: 1 satuan
d1 = 0
d2 = 0
d3 = 0
d4 = 1
d5 = 1
d6 = 0
Diberikan D1 : 1 satuan
d1 = 0
d2 = 1
d3 = 1
d4 = 0
d5 = 0
d6 = 0
Diberikan D3 : 1 satuan
d1 = 0
d2 = 0
d3 = 0
d4 = 0
d5 = 0
d6 = 1
0 0 0
1 0 0
1 0 0
0 1 0
0 1 0
0 0 1
[ A ] =
SR1 4 EI / L 2 EI/L 0 0 0 0 d1
SR2 2 EI / L 4 EI/L 0 0 0 0 d2
SR3 0 0 4 EI / L 2 EI/L 0 0 d3
SR4 0 0 2 EI / L 4 EI/L 0 0 d4
SR5 0 0 0 0 4EI / L 2 EI / L d5
SR6 0 0 0 0 2 EI/L 4 EI / L d6
=
SR1 SR2 SR5 SR6
d3
SR3 SR4`
d1 d2
d4
d5 d6
C. Matriks Kekokohan Batang dari Hubungan SR dan d
SR1
SR2 SR5
SR6
P1
P2
SR3 SR4`
[P] = [ B] {SR}
Ternyata [ B ] = [ A ]T
P3
0 1 1 0 0 0
0 0 0 1 1 0
0 0 0 0 0 1
[ B ] =
MATRIKS KESETIMBANGAN GAYA LUAR (P) dan GAYA DALAM ( SR )
3. Perhitungan Matriks GAYA luar [P]
Matriks P merupakan penjumlahan momen primer pada satu
titik kumpul
4. Menentukan matriks Kekakuan struktur
[ K ] = [ A ]T [ S ] [A ]
5. Menentukan Matriks [ K ] -1
6. Menentukan Matriks { D ] = [ K ] -1 [ P }`
7. Menentukan Matriks gaya Dalam [ SR ] = [ S ] { A ] [ D ]
8. Menentukan Momen akhir M = [ M ]f - [ SR ]
Contoh BALOK STATIS TIDAK TENTU
CONTOH SOAL
30 KN
20 KN/m 16 KN/m 24 KN
2 EI 3 EI 4 EI
A B C D E
6 4,0 2,0 12.0 2,0
DIKETAHUI : STRUKTUR BALOK STATIS TIDAK TENTU TERGAMBAR
DITANYAKAN : HITUNG GAYA-GAYA DALAM DENGAN METODE MATRIKS
KEKAKUAN KEBEBASAN SESUNGGUHNYA
PENYELESAIAN
1. Menentukan Derajat Kebebasan
Derajat kebebasan n = 3 ( Hanya derajat kebebasan rotational )
2. ASUMSI-ASUMSI STRUKTUR
a. STRUKTUR DASAR YANG DIKEKANG
A B C D
b. Hubungan kebebasan titik Diskrit ( D ) dan deformasi
d1 d3 d5
D1 D2
d2 d4 d6 D3
6 4,0 2,0 12.0 2,0
c Hubungan Gaya dalam dan deformasi
SR! SR2 SR3 SR4 SR5 SR6
d. Hubungan Gaya luar dan Kebebasan
P1 P2 P3
D1 D2 D3
3. Perhitungan Momen Primer dan Matriks P
Mfab = -5/96 q L2
= - 5/96 * 20 * 62
= -37.5 KN m
Mfba = +5/96 q L2
= + 5/96 * 20 * 62
= 37.5 KN m
Mfbc = -( P. a. b2
) / L2
= - 30 * 4 * 22
/ 62
= -13.33 KN m
Mfcb = -( P. a2
. b) / L2
= 30 * 42
* 2 / 62
= 26.667 KN m
Mfcd = -1/12 q L2
= - 1/12 * 16 * 122
= -192 KN m
Mfdc = +1/12 q L2
= + 1/12 * 16 * 122
= 192 KN m
Mde = - ( p. L4 ) = - 24 * 2 = = -48 KN m
Matriks P
P1 = Mfba + Mfbc = 24.1667 KN m
P2 = Mfcb + Mfcd = -165.33 KN m
P3 = Mfdc + Mde = 144 KN m
24.1667
-165.33
144
=
P
4. Menenetukan Matriks A dari Hubungan D dan d
d1 d3 d5
D1 D2
d2 d4 d6 D3
Diberikan D1 : 1 satuan
d1 = 0
d2 = 1
d3 = 1
d4 = 0
d5 = 0
d6 = 0
Diberikan D2 : 1 satuan
d1 = 0
d2 = 0
d3 = 0
d4 = 1
d5 = 1
d6 = 0
Diberikan D3 : 1 satuan
d1 = 0
d2 = 0
d3 = 0
d4 = 0
d5 = 0
d6 = 1
Matriks A
0 0 0
1 0 0
[ A ] = 1 0 0
0 1 0
0 1 0
0 0 1
5. Menentukan matriks B = AT
0 1 1 0 0 0
0 0 0 1 1 0
0 0 0 0 0 1
6. Menentukan Matriks Kekokohan bahan dari hubungan SR dan d
1.33333 0.66667 0 0 0 0
0.66667 1.33333 0 0 0 0
0 0 2.000 1.000 0 0
[ S ] = EI 0 0 1.000 2.000 0 0
0 0 0 0 1.3333 0.6667
0 0 0 0 0.6667 1.3333
[ A
T
] =
7. Menentukan Matriks Kekakuan struktur [ K ] = [ A ]
T
[ S ] [ A ]
0.66667 0 0
1.33333 0 0
[ S ] [ A ] = EI 2 1 0
1 2 0
0 1.33333 0.66667
0 0.66667 1.33333
3.33333 1 0
[ K ] = EI 1 3.33333 0.66667
0 0.66667 1.33333
8. Menentukan Matriks K inv
0.33333 -0.1111 0.05556
[ K ]-1
= 1/ EI -0.1111 0.37037 -0.1852
0.05556 -0.1852 0.84259
9. Menentukan Matriks D
[ P ] = [ K ] [ D ]
[ D ] = [ K ]
-1
[ P ]
D1 34.4259
D2 = 1/EI -90.586
D3 153.293
10. Menentukan Matriks Gaya Dalam [ SR ] = [ S ] [ A ] [ D ]
SR1 22.9506
SR2 45.9012
SR3 = -21.735
SR4 -146.75
SR5 -18.586
SR6 144
11. Menentukan Momen AKHIR [ M ] = [ Mf ] - [ SR ]
MAB -37.5 22.9506 -60.45
MBA 37.5 45.9012 -8.401
MBC -13.333 -21.735 8.4012
MCB = 26.6667 - -146.75 = 173.41
MCD -192 -18.586 -173.4
MDc 192 144 48
MAB = -60.451 KN m
MBA = -8.4012 KN m
MBC = 8.40123 KN m
MCB = 173.414 KN m
MCD = -173.41 KN m
MDC = 48 KN m
SOAL - SOAL
24 KN
20 KN/m 16 KN/m'
3 EI 4 EI
6,0 12.0 2,0
DIKETAHUI : STRUKTUR BALOK STATIS TIDAK TENTU TERGAMBAR
DITANYAKAN : HITUNG GAYA-GAYA DALAM DENGAN METODE MATRIKS
KEKAKUAN KEBEBASAN SESUNGGUHNYA
SEKIAN
SAMPAI KULIAH
BERIKUTNYA

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matriks kekakuan kebebabasan sesungguhnya pada balok statis tdk tentu

  • 1. APLIKASI MKKS PADA BALOK STATIS TIDAK TENTU • PROSEDURE PERHITUNGAN 1. TENTUKAN DERAJAT KEBEBASAN STRUKTUR DOF = 3 2. TETAPKAN PARAMETER STRUKTUR A. STRUKTUR DASAR YANG DIKEKANG D2 D1 D3
  • 2. B. Hubungan D dengan d d1 d2 d5 d6 d3 d4 D1 D2 D3 [d] = [ A]{D} Diberikan D2: 1 satuan d1 = 0 d2 = 0 d3 = 0 d4 = 1 d5 = 1 d6 = 0 Diberikan D1 : 1 satuan d1 = 0 d2 = 1 d3 = 1 d4 = 0 d5 = 0 d6 = 0 Diberikan D3 : 1 satuan d1 = 0 d2 = 0 d3 = 0 d4 = 0 d5 = 0 d6 = 1 0 0 0 1 0 0 1 0 0 0 1 0 0 1 0 0 0 1 [ A ] =
  • 3. SR1 4 EI / L 2 EI/L 0 0 0 0 d1 SR2 2 EI / L 4 EI/L 0 0 0 0 d2 SR3 0 0 4 EI / L 2 EI/L 0 0 d3 SR4 0 0 2 EI / L 4 EI/L 0 0 d4 SR5 0 0 0 0 4EI / L 2 EI / L d5 SR6 0 0 0 0 2 EI/L 4 EI / L d6 = SR1 SR2 SR5 SR6 d3 SR3 SR4` d1 d2 d4 d5 d6 C. Matriks Kekokohan Batang dari Hubungan SR dan d
  • 4. SR1 SR2 SR5 SR6 P1 P2 SR3 SR4` [P] = [ B] {SR} Ternyata [ B ] = [ A ]T P3 0 1 1 0 0 0 0 0 0 1 1 0 0 0 0 0 0 1 [ B ] = MATRIKS KESETIMBANGAN GAYA LUAR (P) dan GAYA DALAM ( SR )
  • 5. 3. Perhitungan Matriks GAYA luar [P] Matriks P merupakan penjumlahan momen primer pada satu titik kumpul 4. Menentukan matriks Kekakuan struktur [ K ] = [ A ]T [ S ] [A ] 5. Menentukan Matriks [ K ] -1 6. Menentukan Matriks { D ] = [ K ] -1 [ P }` 7. Menentukan Matriks gaya Dalam [ SR ] = [ S ] { A ] [ D ] 8. Menentukan Momen akhir M = [ M ]f - [ SR ]
  • 6. Contoh BALOK STATIS TIDAK TENTU CONTOH SOAL 30 KN 20 KN/m 16 KN/m 24 KN 2 EI 3 EI 4 EI A B C D E 6 4,0 2,0 12.0 2,0 DIKETAHUI : STRUKTUR BALOK STATIS TIDAK TENTU TERGAMBAR DITANYAKAN : HITUNG GAYA-GAYA DALAM DENGAN METODE MATRIKS KEKAKUAN KEBEBASAN SESUNGGUHNYA PENYELESAIAN 1. Menentukan Derajat Kebebasan Derajat kebebasan n = 3 ( Hanya derajat kebebasan rotational )
  • 7. 2. ASUMSI-ASUMSI STRUKTUR a. STRUKTUR DASAR YANG DIKEKANG A B C D b. Hubungan kebebasan titik Diskrit ( D ) dan deformasi d1 d3 d5 D1 D2 d2 d4 d6 D3 6 4,0 2,0 12.0 2,0 c Hubungan Gaya dalam dan deformasi SR! SR2 SR3 SR4 SR5 SR6 d. Hubungan Gaya luar dan Kebebasan P1 P2 P3 D1 D2 D3
  • 8. 3. Perhitungan Momen Primer dan Matriks P Mfab = -5/96 q L2 = - 5/96 * 20 * 62 = -37.5 KN m Mfba = +5/96 q L2 = + 5/96 * 20 * 62 = 37.5 KN m Mfbc = -( P. a. b2 ) / L2 = - 30 * 4 * 22 / 62 = -13.33 KN m Mfcb = -( P. a2 . b) / L2 = 30 * 42 * 2 / 62 = 26.667 KN m Mfcd = -1/12 q L2 = - 1/12 * 16 * 122 = -192 KN m Mfdc = +1/12 q L2 = + 1/12 * 16 * 122 = 192 KN m Mde = - ( p. L4 ) = - 24 * 2 = = -48 KN m Matriks P P1 = Mfba + Mfbc = 24.1667 KN m P2 = Mfcb + Mfcd = -165.33 KN m P3 = Mfdc + Mde = 144 KN m 24.1667 -165.33 144 = P
  • 9. 4. Menenetukan Matriks A dari Hubungan D dan d d1 d3 d5 D1 D2 d2 d4 d6 D3 Diberikan D1 : 1 satuan d1 = 0 d2 = 1 d3 = 1 d4 = 0 d5 = 0 d6 = 0 Diberikan D2 : 1 satuan d1 = 0 d2 = 0 d3 = 0 d4 = 1 d5 = 1 d6 = 0 Diberikan D3 : 1 satuan d1 = 0 d2 = 0 d3 = 0 d4 = 0 d5 = 0 d6 = 1 Matriks A 0 0 0 1 0 0 [ A ] = 1 0 0 0 1 0 0 1 0 0 0 1
  • 10. 5. Menentukan matriks B = AT 0 1 1 0 0 0 0 0 0 1 1 0 0 0 0 0 0 1 6. Menentukan Matriks Kekokohan bahan dari hubungan SR dan d 1.33333 0.66667 0 0 0 0 0.66667 1.33333 0 0 0 0 0 0 2.000 1.000 0 0 [ S ] = EI 0 0 1.000 2.000 0 0 0 0 0 0 1.3333 0.6667 0 0 0 0 0.6667 1.3333 [ A T ] =
  • 11. 7. Menentukan Matriks Kekakuan struktur [ K ] = [ A ] T [ S ] [ A ] 0.66667 0 0 1.33333 0 0 [ S ] [ A ] = EI 2 1 0 1 2 0 0 1.33333 0.66667 0 0.66667 1.33333 3.33333 1 0 [ K ] = EI 1 3.33333 0.66667 0 0.66667 1.33333 8. Menentukan Matriks K inv 0.33333 -0.1111 0.05556 [ K ]-1 = 1/ EI -0.1111 0.37037 -0.1852 0.05556 -0.1852 0.84259
  • 12. 9. Menentukan Matriks D [ P ] = [ K ] [ D ] [ D ] = [ K ] -1 [ P ] D1 34.4259 D2 = 1/EI -90.586 D3 153.293 10. Menentukan Matriks Gaya Dalam [ SR ] = [ S ] [ A ] [ D ] SR1 22.9506 SR2 45.9012 SR3 = -21.735 SR4 -146.75 SR5 -18.586 SR6 144
  • 13. 11. Menentukan Momen AKHIR [ M ] = [ Mf ] - [ SR ] MAB -37.5 22.9506 -60.45 MBA 37.5 45.9012 -8.401 MBC -13.333 -21.735 8.4012 MCB = 26.6667 - -146.75 = 173.41 MCD -192 -18.586 -173.4 MDc 192 144 48 MAB = -60.451 KN m MBA = -8.4012 KN m MBC = 8.40123 KN m MCB = 173.414 KN m MCD = -173.41 KN m MDC = 48 KN m
  • 14. SOAL - SOAL 24 KN 20 KN/m 16 KN/m' 3 EI 4 EI 6,0 12.0 2,0 DIKETAHUI : STRUKTUR BALOK STATIS TIDAK TENTU TERGAMBAR DITANYAKAN : HITUNG GAYA-GAYA DALAM DENGAN METODE MATRIKS KEKAKUAN KEBEBASAN SESUNGGUHNYA