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MEKANIKA REK A YASA 1

MEKANIKA REK A YASA 1. Pengertian Gaya Momen dan Pengertian statis tertentu Perletakan dan macam konstruksi Gaya = Normal, Lintang, Momen Bidang = Normal, Lintang Momen Konstruksi 3 sendi = Portal dan Pelengkung 3 sendi Balok Gerber Garis Pengaruh pada balok dan portal 3 sendi.

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MEKANIKA REK A YASA 1

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  1. MEKANIKA REKAYASA 1 • Pengertian Gaya • Momen dan Pengertian statis tertentu • Perletakan dan macam konstruksi • Gaya = Normal, Lintang, Momen • Bidang = Normal, Lintang Momen • Konstruksi 3 sendi = Portal dan Pelengkung 3 sendi • Balok Gerber • Garis Pengaruh pada balok dan portal 3 sendi

  2. Gaya,Beban, dan Perletakan • Gaya Vektor= Besaran yang mempunyai harga,arah dan titik awal • Vektor Bidang Ruang Beban Terpusat/Garis (ton,kg) Terbagi Rata/Merata(ton/m , kg/m)

  3. Perletakan • Roll • Sendi V H • V • Jepit H M V • Pendel A B

  4. Perjanjian Tanda Arah • V H P • A B • ½ L ½ L + - - +

  5. Contoh soal • P=3V2 • A C B • Sin 45=Pv/p MB=0 MA=0 • =Pv/3v2 VA.10-Pv.6 =0 VB.10-3.4=0 • Pv = sin 45.3v2 VA.10-3.6 =0 VB=12/10 Pv = 1,5.2 VA.10 =18 VB=1,2 T Pv = 3 VA =1,8 T 4m 6m

  6. Gaya Normal • Gaya yang arahnya tegak lurus bidang penampang • Dapat berupa : • Gaya Tarik (+)meninggalkan titik simpul • Gaya Tekan (-)menuju titik simpul

  7. Gaya Lintang • Gaya yang Arahnya sejajar dengan bidang penampang - +

  8. Gaya Momen • Gaya akibat beban Lendutan + - -

  9. Bidang D • X Q • A C B • ½ L ½ L • MB=0 MA=0 • VaxL-qL.L/2=0 VB.L-QX.1/2L=0 • Va=1/2 qL2=1/2qL VB=1/2QL • L • =1/2 QL

  10. Gaya Lintang • Di A x=o DA = ½ q.l – q.o=1/2ql • Di C x=1/2l DC=1/2ql-qx1/2l=o • Di B x=l DB= ½ ql=-1/2ql • + • A C - B

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