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Mekanika Kekuatan Material, Kuliah 12
Defleksi Balok
Metode Luas Momen
Mekanika Kekuatan Material
STTM, 2013
Mekanika Kekuatan Material, Kuliah 12
Metode Luas
Momen
maka
karena
Mekanika Kekuatan Material, Kuliah 12
Untuk titik C dan D θD/C = luas di bawah
diagram (M/EI) antara
Teorema luas momen 1 C dan D, bernilai
positif (luas berada
di atas sumbu x,
arah berlawanan
jarum jam
Mekanika Kekuatan Material, Kuliah 12
Metode Luas Momen
Mekanika Kekuatan Material, Kuliah 12
dtbisadiasumsikanpanjangbusurlingkaran
ygdibentukolehd θ
JikadiintegralkansepanjangC keD
tC/D= (luasantaraC danD).x 1
tD/C= (luasantaraC danD).x 2
x1 adalahletakcentroid
Mekanika Kekuatan Material, Kuliah 12
Ilustrasi
Tentukanlah slope dan
defleksi di ujung B dari
balok
AB jika dibebani seperti
gambar. Dalam hal ini EI=10 MN.m2
Solusi:
DBB
DML
Mekanika Kekuatan Material, Kuliah 12
Beberapa contoh kondisi batas
Solusi
DenganmembagiDML denganEI diperoleh
diagram M/EI. Luasdiatassumbux adalahpositif
Sedangkandibawahsumbux adalahnegatif
Mekanika Kekuatan Material, Kuliah 12
Diagram Momen
Lentur Per Bagian
Mekanika Kekuatan Material, Kuliah 12
Penentuan sudut slope θD/C dan deviasi
tangensial tD/C dapat dilakukan per bagian
dari setiap beban yang diberikan. Dari
setiap beban, diagram M/EI digambar
Sudut θD/C untuk semua beban diperoleh
dengan menambahkan luas diagram M/EI
dari setiap beban demikian juga untuk
menentukan tD/C diperoleh dengan
menambahkan first momen dari luas tsb
thd sumbu vertikal yang melalui D
Luas momen dan
letak centroid beberapa
bentuk sederhana
Mekanika Kekuatan Material, Kuliah 12
Contoh
karena
Mekanika Kekuatan Material, Kuliah 12
Contoh
Tentukan slope dan defleksi di ujung A
DBB
DML
Diagram M/EI
Mekanika Kekuatan Material, Kuliah 12
Solusi
Latihan
Mekanika Kekuatan Material, Kuliah 12
Dengan metode luas momen, tentukan slope dan
defleksi di ujung bebas A

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Defleksi Luas Momen 1.pdf

  • 1. Mekanika Kekuatan Material, Kuliah 12 Defleksi Balok Metode Luas Momen Mekanika Kekuatan Material STTM, 2013
  • 2. Mekanika Kekuatan Material, Kuliah 12 Metode Luas Momen maka karena
  • 3. Mekanika Kekuatan Material, Kuliah 12 Untuk titik C dan D θD/C = luas di bawah diagram (M/EI) antara Teorema luas momen 1 C dan D, bernilai positif (luas berada di atas sumbu x, arah berlawanan jarum jam
  • 4. Mekanika Kekuatan Material, Kuliah 12 Metode Luas Momen
  • 5. Mekanika Kekuatan Material, Kuliah 12 dtbisadiasumsikanpanjangbusurlingkaran ygdibentukolehd θ JikadiintegralkansepanjangC keD tC/D= (luasantaraC danD).x 1 tD/C= (luasantaraC danD).x 2 x1 adalahletakcentroid
  • 6. Mekanika Kekuatan Material, Kuliah 12 Ilustrasi Tentukanlah slope dan defleksi di ujung B dari balok AB jika dibebani seperti gambar. Dalam hal ini EI=10 MN.m2 Solusi: DBB DML
  • 7. Mekanika Kekuatan Material, Kuliah 12 Beberapa contoh kondisi batas Solusi DenganmembagiDML denganEI diperoleh diagram M/EI. Luasdiatassumbux adalahpositif Sedangkandibawahsumbux adalahnegatif
  • 8. Mekanika Kekuatan Material, Kuliah 12 Diagram Momen Lentur Per Bagian
  • 9. Mekanika Kekuatan Material, Kuliah 12 Penentuan sudut slope θD/C dan deviasi tangensial tD/C dapat dilakukan per bagian dari setiap beban yang diberikan. Dari setiap beban, diagram M/EI digambar Sudut θD/C untuk semua beban diperoleh dengan menambahkan luas diagram M/EI dari setiap beban demikian juga untuk menentukan tD/C diperoleh dengan menambahkan first momen dari luas tsb thd sumbu vertikal yang melalui D Luas momen dan letak centroid beberapa bentuk sederhana
  • 10. Mekanika Kekuatan Material, Kuliah 12 Contoh karena
  • 11. Mekanika Kekuatan Material, Kuliah 12 Contoh Tentukan slope dan defleksi di ujung A DBB DML Diagram M/EI
  • 12. Mekanika Kekuatan Material, Kuliah 12 Solusi Latihan
  • 13. Mekanika Kekuatan Material, Kuliah 12 Dengan metode luas momen, tentukan slope dan defleksi di ujung bebas A