TUGAS DESAIN DAN
TUGAS DESAIN DAN ANALISA STRUKTUR JEMBAANALISA STRUKTUR JEMBATAN KAYU TAN KAYU 20092009
POLITEKNIK NEGERI JAKARTA POLITEKNIK NEGERI JAKARTA
1
1 PEMODELAN STRUKTUR
PEMODELAN STRUKTUR
Pemodelan struktur didasarkan atas panjang bentang ekonomis dengan dengan tidak Pemodelan struktur didasarkan atas panjang bentang ekonomis dengan dengan tidak mengabaikan estetika keindahan dari jembatan itu sendiri ( Arsitektural ). Dalam melakukan mengabaikan estetika keindahan dari jembatan itu sendiri ( Arsitektural ). Dalam melakukan pemodelan struktur jembatan rangka batang tentunya harus memenuhi persamaan pemodelan struktur jembatan rangka batang tentunya harus memenuhi persamaan keseimbangan, sehingga strutur rangka batang tersebut menjadi statis tertentu dan dapat keseimbangan, sehingga strutur rangka batang tersebut menjadi statis tertentu dan dapat diselesaikan dengan persamaan keseimbangan. Dalam hal pemodelan struktur jembatan diselesaikan dengan persamaan keseimbangan. Dalam hal pemodelan struktur jembatan rangka batang 2 dimensi agar struktur tersebut dikatakan struktur statis tertentu maka harus rangka batang 2 dimensi agar struktur tersebut dikatakan struktur statis tertentu maka harus memenuhi persamaan
memenuhi persamaan m = 2n - 3m = 2n - 3, dimana, dimana mm adalah jumlah batang danadalah jumlah batang dan nnadalah jumlah titik adalah jumlah titik simpul. Gambar di bawah ini merupakan model struktur jembatan kayu yang kami simpul. Gambar di bawah ini merupakan model struktur jembatan kayu yang kami
rencanakan : rencanakan :
Kontrol : Kontrol :
Jumlah
Jumlah batang batang vertikal vertikal = = 7 7 batangbatang
Jumlah
Jumlah batang batang horizontal horizontal = = 10 10 batangbatang
Jumlah
Jumlah batang batang diagonal diagonal = = 8 8 batang batang ++
Total
Total batang batang = = 25 25 batang batang (m)(m)
Jumlah
Jumlah titik titik simpul simpul = = 14 14 titik titik
m = 2n – 3 m = 2n – 3 25 = 2.14 – 3 25 = 2.14 – 3 25 = 28 – 3 25 = 28 – 3 25 25 = = 25 25 ...(OK)...(OK)
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TUGAS DESAIN DAN
TUGAS DESAIN DAN ANALISA STRUKTUR JEMBAANALISA STRUKTUR JEMBATAN KAYU TAN KAYU 20092009
2 2 PEMBEBANAN
PEMBEBANAN
Jembatan kayu ini direncanakan untuk pejalan kaki ( pedestrian ) sehingga beban – Jembatan kayu ini direncanakan untuk pejalan kaki ( pedestrian ) sehingga beban – beban yang bekerja ditetapkan sebesar 200 kg dan bekerja pada tiap titik simpul di bawah beban yang bekerja ditetapkan sebesar 200 kg dan bekerja pada tiap titik simpul di bawah lantai jembatan dengan mengabaikan berat struktur jembatan itu sendiri. Berikut gambar lantai jembatan dengan mengabaikan berat struktur jembatan itu sendiri. Berikut gambar rencana pembebanan yang bekerja :
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TUGAS DESAIN DAN
TUGAS DESAIN DAN ANALISA STRUKTUR JEMBAANALISA STRUKTUR JEMBATAN KAYU TAN KAYU 20092009
3 3 ANALISA STRUKTUR
ANALISA STRUKTUR A. MENCARI REAKSI
A. MENCARI REAKSI PERLETAKANPERLETAKAN
B. MENCARI GAYA BATANG B. MENCARI GAYA BATANG
Metoda yang digunakan dalam penghitungan gaya – gaya batang adalah dengan Metoda yang digunakan dalam penghitungan gaya – gaya batang adalah dengan menggunakan metoda pembagian ( Metoda Ritter )
menggunakan metoda pembagian ( Metoda Ritter )
GAMBAR POTONGAN PERHITUNGAN GAYA BATANG GAMBAR POTONGAN PERHITUNGAN GAYA BATANG
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TUGAS DESAIN DAN
TUGAS DESAIN DAN ANALISA STRUKTUR JEMBAANALISA STRUKTUR JEMBATAN KAYU TAN KAYU 20092009
4 4 ∑M ∑M B B= 0= 0 RHv . (1) - b RHv . (1) - b 1 1. (0.5) + v. (0.5) + v11. (1) = 0. (1) = 0 700 . (1)- 0.5b 700 . (1)- 0.5b 1 1+ (-700) . (1) = 0+ (-700) . (1) = 0 -0.5b -0.5b 1 1= 0= 0 b b 1 1= 0= 0 ∑M ∑M II= 0= 0 RHv . (1) + v RHv . (1) + v 1 1. (1) = 0. (1) = 0 700 . (1) + v 700 . (1) + v 1 1 = 0= 0 v v 1 1= = -700 -700 kg (tkg (tekan)ekan) ∑M ∑M B B= 0= 0 RHv . (1) - d RHv . (1) - d 1v 1v. (1) . p. (1) . p11. (1) - b. (1) - b11. (0,5) = 0. (0,5) = 0 700 . (1) - d 700 . (1) - d 1 1sin 26,57 - 200 . (1) - 0 . (0,5) = 0sin 26,57 - 200 . (1) - 0 . (0,5) = 0 - d - d 1 1sin 26,57 + 500 = 0sin 26,57 + 500 = 0 d d 1 1sin 26,57 = 500sin 26,57 = 500 d d 1 1= = 1117 1117 kg kg (tekan)(tekan) ∑M ∑M II= 0= 0 RHv . (1) + a RHv . (1) + a 1 1. (0,5) - p. (0,5) - p11. (1) = 0. (1) = 0 700 . (1) + 0,5a 700 . (1) + 0,5a 1 1- 200) . (1) = 0- 200) . (1) = 0 0,5a 0,5a 1 1+ 500 = 0+ 500 = 0 0,5a 0,5a 1 1= -500= -500 a a 1 1= -= -1000 1000 kg kg (tekan)(tekan) POT. I – I POT. I – I POT. II – II POT. II – II
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TUGAS DESAIN DAN
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5 5 ∑M ∑M A A= 0= 0 p p 2 2. (1) + v. (1) + v22. (1) – b. (1) – b11. (0,5) = 0. (0,5) = 0 200 . (1) + v 200 . (1) + v 2 2+ 0,05 = 0+ 0,05 = 0 200 + v 200 + v 2 2= 0= 0 v v 2 2= = -200 -200 kg kg (tekan)(tekan) ∑M ∑M II= 0= 0 RHv . (1) + p RHv . (1) + p 1 1. (1) – a. (1) – a 22. (0,5) = 0. (0,5) = 0 700 . (1) + 200 . (1) + 0,5a 700 . (1) + 200 . (1) + 0,5a 2 2= 0= 0 700 – 200 + 0,5a 700 – 200 + 0,5a 2 2 = 0= 0 500 + 0,5a 500 + 0,5a 2 2= 0= 0 a a 2 2= = -1000 -1000 kg kg (tekan)(tekan)
POT. III – III POT. III – III
∑M ∑M C C= 0= 0 RHv . (2) - p RHv . (2) - p 1 1. (2) - p. (2) - p22. (1) + d. (1) + d3v3v. (1) – d. (1) – d3h3h. (0,5) = 0. (0,5) = 0 700 . (2) - 200. (2 700 . (2) - 200. (2) - 200) - 200. (1) + d. (1) + d 3
3sin26,57 . (1) – dsin26,57 . (1) – d33cos26,57 . (0,5) = 0cos26,57 . (0,5) = 0 1400 – 400 - 200 – 0.45 d 1400 – 400 - 200 – 0.45 d 3 3– 0,89d– 0,89d33. (0,5) = 0. (0,5) = 0 800 – 0,895d 800 – 0,895d 3 3= 0= 0 d d 3 3= 893,85 kg (tarik)= 893,85 kg (tarik) ∑M ∑M j j= 0= 0 RHv . (2) – p RHv . (2) – p 1 1. (2) - 200. (2) - 200 . (1) – a. (1) – a22. (1) + d. (1) + d2v2v. (1) + d. (1) + d2h2h. (0,5) = 0. (0,5) = 0 700 . (2) – 200. (2)
700 . (2) – 200. (2) – 200– 200 . (1) – 1000. (1) . (1) – 1000. (1) + d+ d sin26,57 . (1) + dsin26,57 . (1) + d cos26,57 . (0,5) = 0cos26,57 . (0,5) = 0
POT. IV – IV POT. IV – IV
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TUGAS DESAIN DAN
TUGAS DESAIN DAN ANALISA STRUKTUR JEMBAANALISA STRUKTUR JEMBATAN KAYU TAN KAYU 20092009
6 6 ∑M ∑M C C= 0= 0 RHv . (2) - p RHv . (2) - p 1 1. (2) - p. (2) - p22. (1) – b. (1) – b22. (1) = 0. (1) = 0 700 . (2) - 200. (2) - 200 700 . (2) - 200. (2) - 200 . (1) – 200 . (1) . (1) – 200 . (1) – b– b 2 2= 0= 0 1400 – 400 - 200 1400 – 400 - 200 – b– b 2 2= 0= 0 800 – b 800 – b 2 2= 0= 0 b b 2 2= 800 kg (tarik)= 800 kg (tarik) ∑M ∑M II= 0= 0 RHv . (1) - p RHv . (1) - p 1 1. (1) – v. (1) – v33. (1) – b. (1) – b22. (0,5) + a. (0,5) + a22. (0,5) = 0. (0,5) = 0 700 . (1) - 200. (1) 700 . (1) - 200. (1) - v- v 3 3– 800 . (0,5) – 1000 . – 800 . (0,5) – 1000 . (0,5) = 0(0,5) = 0 500 – v 500 – v 3 3– 400 – 400 – – 500 = 0500 = 0 – v – v 3 3– 400 = 0– 400 = 0 v v 3
3= - = - 400 400 kg (tekkg (tekan)an)
POT. V – V POT. V – V
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TUGAS DESAIN DAN
TUGAS DESAIN DAN ANALISA STRUKTUR JEMBAANALISA STRUKTUR JEMBATAN KAYU TAN KAYU 20092009
∑M ∑M D D= 0= 0 RHv . (3) – p RHv . (3) – p 1 1. (3) – p. (3) – p22. (2) – d. (2) – d4v4v. (1) + b. (1) + b22. (1) = 0. (1) = 0 700 . (3) – 200. (3 700 . (3) – 200. (3) – 200) – 200 . (2) – 200. (1) + d. (2) – 200. (1) + d sin45 . (1) – 800 . (1sin45 . (1) – 800 . (1) = 0) = 0 ∑M ∑M k k= 0= 0 RHv . (3) – p RHv . (3) – p 1 1. (3) – p. (3) – p22. (2) – p. (2) – p11. (1) – a. (1) – a33. (1) = 0. (1) = 0 700 . (3) – 200. (3) – 400 700 . (3) – 200. (3) – 400 . (2) – 200 . (1) – a. (2) – 200 . (1) – a 3 3= 0= 0 2100 – 600 – 400 – 200 2100 – 600 – 400 – 200 – a– a 3 3= 0= 0 900 – a 900 – a 3 3= 0= 0 a a 3 3= -900 kg (tekan)= -900 kg (tekan) POT. VI – VI POT. VI – VI
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TUGAS DESAIN DAN
TUGAS DESAIN DAN ANALISA STRUKTUR JEMBAANALISA STRUKTUR JEMBATAN KAYU TAN KAYU 20092009
∑M ∑M k k= 0= 0 RHv . (3) – p RHv . (3) – p 1 1. (3) – p. (3) – p22. (2) – p. (2) – p33. (1) – a. (1) – a44. (1) = 0. (1) = 0 700 . (3) – 200. (3) – 200 700 . (3) – 200. (3) – 200 . (2) – 200 . (1) . (2) – 200 . (1) – a– a 4 4= 0= 0 2100 – 600 – 400 2100 – 600 – 400 – 200 – a– 200 – a 4 4= 0= 0 900 – a 900 – a 4 4= 0= 0 a a 4 4= -900 kg (tekan)= -900 kg (tekan) POT. VI – VI POT. VI – VI ∑M ∑M cc= 0= 0 RHv . (2) – p RHv . (2) – p 1 1. (2) – p. (2) – p22. (1) + p. (1) + p44. (1) – v. (1) – v44. (1) – b. (1) – b22. (1 ) = 0. (1 ) = 0 700 . (2) – 200. ( 700 . (2) – 200. (2) – 2002) – 200 . (1) + 200 . (1) – v. (1) + 200 . (1) – v 4 4 – 800 . (1) = 0– 800 . (1) = 0 1400 – 400 – 200 – 1400 – 400 – 200 – 200 + v200 + v 4 4= 0= 0 200 + v 200 + v 4 4= 0= 0 v v 4 4= -200 kg (tekan)= -200 kg (tekan)
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TUGAS DESAIN DAN
TUGAS DESAIN DAN ANALISA STRUKTUR JEMBAANALISA STRUKTUR JEMBATAN KAYU TAN KAYU 20092009
NO
NO BATANG BATANG PANJANGPANJANG (m) (m)
GAYA BATANG (KG) GAYA BATANG (KG) TARIK
TARIK (+) (+) TEKAN TEKAN (-)(-) 1 1 1 1 10001000 2 2 1 1 10001000 3 3 1 1 900900 4 4 1 1 900900 5 5 1 1 10001000 6 6 1 1 10001000 7 7 0,5 0,5 700700 8 8 0,5 0,5 200200 9 9 1 1 400400 10 10 1 1 200200 11 11 1 1 400400 12 12 0,5 0,5 200200 13 13 0,5 0,5 700700 14 14 1,12 1,12 1117,84011117,8401 15 15 1,12 1,12 223,46223,46 16 16 1,12 1,12 893,85893,85 17 17 1,41 1,41 141,42141,42 18 18 1,41 1,41 141,42141,42
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TUGAS DESAIN DAN
TUGAS DESAIN DAN ANALISA STRUKTUR JEMBAANALISA STRUKTUR JEMBATAN KAYU TAN KAYU 20092009
PERENCANAAN DIMENSI PERENCANAAN DIMENSI
Jembatan direncanakan dengan spesifikasi sebagai berikut : Jembatan direncanakan dengan spesifikasi sebagai berikut : 1.
1. Menggunakan Kayu JatiMenggunakan Kayu Jati
Kelas II mutu A Kelas II mutu A (PKKI 1961 Lampiran I )(PKKI 1961 Lampiran I )
BJ = 0,7 gr/cmBJ = 0,7 gr/cm33(PKKI 1961 Lampiran I )(PKKI 1961 Lampiran I )
Elastisitas = 100.000 kg/cmElastisitas = 100.000 kg/cm22( PKKI 1961 Daftar I )( PKKI 1961 Daftar I )
Tegangan yang diperkenankan ( PKKI 1961 Daftar II )Tegangan yang diperkenankan ( PKKI 1961 Daftar II ) σσltlt= 130 kg/cm= 130 kg/cm22 σσtk tk II = σII = σ trtrII = 110 kg/cmII = 110 kg/cm22 σσtk tk IL = 30 kg/cmIL = 30 kg/cm22 τ II = 15 kg/cmτ II = 15 kg/cm22 2.
2. Direncanakan menahan beban tetap dan tidak tetapDirencanakan menahan beban tetap dan tidak tetap Faktor reduksi (
Faktor reduksi ( γγ) = 5/4 ( PKKI Pasal 6 ayat 1b )) = 5/4 ( PKKI Pasal 6 ayat 1b ) 3.
3. Jenis struktur rangka batang tak terJenis struktur rangka batang tak terlindungilindungi
Faktor reduksi ( β ) = 5/6
Faktor reduksi ( β ) = 5/6 ( PKKI Pasal 6 ayat 2b )( PKKI Pasal 6 ayat 2b )
MENGHITUNG TEGANGAN – TEGANGAN IJIN MENGHITUNG TEGANGAN – TEGANGAN IJIN
= 130
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TUGAS DESAIN DAN ANALISA STRUKTUR JEMBATAN KAYU
TUGAS DESAIN DAN ANALISA STRUKTUR JEMBATAN KAYU 20092009
MENGHITUNG DIMENSI
MENGHITUNG DIMENSI
P = - 1000 kg P = - 1000 kg h = 2b h = 2b lk = 1m lk = 1m IIminmin= 50 P= 50 Ptk tk . lk . lk 22 ω = 1,854ω = 1,854 Kontrol tegangan Kontrol tegangan TARIK TARIK P = 1117,8401 kg P = 1117,8401 kgThe world’s largest digital library
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TUGAS DESAIN DAN
TUGAS DESAIN DAN ANALISA STRUKTUR JEMBAANALISA STRUKTUR JEMBATAN KAYU TAN KAYU 20092009
NO
NO BATANG BATANG PANJANGPANJANG
(m)
(m)
GAYA
GAYA BATANG BATANG (KG) (KG) DIMENSIDIMENSI
TARIK
TARIK (+) (+) TEKAN TEKAN (-)(-)
1 1 1 1 10001000 2 2 1 1 10001000 3 3 1 1 900900 4 4 1 1 900900 5 5 1 1 10001000 6 6 1 1 10001000 7 7 0,5 0,5 700700 8 8 0,5 0,5 200200 9 9 1 1 400400 10 10 1 1 200200 11 11 1 1 400400 12 12 0,5 0,5 200200
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TUGAS DESAIN DAN
TUGAS DESAIN DAN ANALISA STRUKTUR JEMBAANALISA STRUKTUR JEMBATAN KAYU TAN KAYU 20092009 LENDUTAN
LENDUTAN MENGHITUNG LENDUTAN
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TUGAS DESAIN DAN
TUGAS DESAIN DAN ANALISA STRUKTUR JEMBAANALISA STRUKTUR JEMBATAN KAYU TAN KAYU 20092009
= 416,67 cm = 416,67 cm44 Batang b2 Batang b2 A = 5 . 10 = 50 cm A = 5 . 10 = 50 cm22 II11= = b hb h33+ A . y+ A . y22 = = . . 5 5 . . 101033+ 50 . 50+ 50 . 5022 = 416,67 + 125000 = 416,67 + 125000 = 125416,67 cm = 125416,67 cm44 IItotaltotal= 251250 cm= 251250 cm44
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TUGAS DESAIN DAN
TUGAS DESAIN DAN ANALISA STRUKTUR JEMBAANALISA STRUKTUR JEMBATAN KAYU TAN KAYU 20092009
Bidang momen akibat P2 Bidang momen akibat P2 A
A33= = . . P2 P2 . . XX22. X. X22
=
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TUGAS DESAIN DAN
TUGAS DESAIN DAN ANALISA STRUKTUR JEMBAANALISA STRUKTUR JEMBATAN KAYU TAN KAYU 20092009
f f ijinijin= 1/700 L= 1/700 L f f ijinijin= 1/700(600)= 1/700(600) f f ijinijin= 0,857 cm= 0,857 cm
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TUGAS DESAIN DAN ANALISA STRUKTUR JEMBAANALISA STRUKTUR JEMBATAN KAYU TAN KAYU 20092009 SAMBUNGAN
SAMBUNGAN
Direncanakan menggunakan sambungan baut dengan menggunakan pelat simpul dari Direncanakan menggunakan sambungan baut dengan menggunakan pelat simpul dari baja ( S
baja ( Sambungambungan tampang dua ).an tampang dua ).
Sambungan bertampang dua golongan II ( PKKI 1961 Pasal 14 a
Sambungan bertampang dua golongan II ( PKKI 1961 Pasal 14 a yayat 5 t 5 )) λ λ bb= 4.3= 4.3 S = 100db S = 100db33( 1 –( 1 –0.6 sin α )0.6 sin α ) S = 200db S = 200db11( 1 –( 1 –0.6 sin α )0.6 sin α )
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S S 1 1 = 100 d b= 100 d b33= (1 – 0,6 sin 90= (1 – 0,6 sin 90 o o )) S S 1
1 = 100 (1) (5) (0,45) = 200 = 100 (1) (5) (0,45) = 200 kgkg(diambil S (diambil S yang terkecilyang terkecil)) S S 3 3 = 430 d= 430 d 2 2 = (1 – 0,35 sin 90 = (1 – 0,35 sin 90oo)) S S 3 3 = 430 (1)= 430 (1) 2 2 (0,65) = 279,5 kg (0,65) = 279,5 kg S S rr = = 1,25 1,25 . . S S . . .. S S rr = = 1,25 1,25 . . 200 200 . . .. S S rr= 260,4167 kg= 260,4167 kg
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SAMBUNGAN – B SAMBUNGAN – B batang a batang a 1 1 & a& a22= -1000 kg= -1000 kg S S 1 1 = 100 d b= 100 d b33= (1 – 0,6 sin 0= (1 – 0,6 sin 0 o o )) S S 1 1 = 100 (1) (5) = 500 = 100 (1) (5) = 500 kgkg S S 3 3 = 430 d= 430 d 2 2 = (1 – 0,35 sin 0 = (1 – 0,35 sin 0oo)) S S 3 3 = 430 (1)= 430 (1) 2
2= 430 kg= 430 kg (diambil S yang terkecil)(diambil S yang terkecil)
S
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3d = 3 . (1) = 3 3d = 3 . (1) = 3 44 5d = 5 . (1) = 5 5d = 5 . (1) = 5 7d = 7 . (1) = 7 7d = 7 . (1) = 7 ≈ 10≈ 10 3,5d = 3,5 . (1) = 3,5 3,5d = 3,5 . (1) = 3,5 ≈ 4≈ 4 SAMBUNGAN – C SAMBUNGAN – C batang a batang a 2 2 = -1000 kg= -1000 kg aa 3 3 = -900 kg= -900 kg S S = 100 d b= 100 d b = (1 – 0,6 sin 0= (1 – 0,6 sin 0oo))
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TUGAS DESAIN DAN
TUGAS DESAIN DAN ANALISA STRUKTUR JEMBAANALISA STRUKTUR JEMBATAN KAYU TAN KAYU 20092009 S S rr= 260,4167 kg= 260,4167 kg 4 Baut4 Baut batang d batang d 2 2= 223,46 kg= 223,46 kg S S 1 1 = 100 d b= 100 d b33= (1 – 0= (1 – 0,6 sin 26,57,6 sin 26,57 o o)) S S 1 1 = 100 (1) (5) (0,73) = 365 = 100 (1) (5) (0,73) = 365 kgkg S S 3 3 = 430 d= 430 d 2 2 = (1 – 0,35 sin 26,57 = (1 – 0,35 sin 26,57oo)) S
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Jarak – jarak baut Jarak – jarak baut 2d = 2 . (1) = 2 2d = 2 . (1) = 2 33 3d = 3 . (1) = 3 3d = 3 . (1) = 3 44
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S S rr = = 1,25 1,25 . . S S . . .. S S rr = = 1,25 1,25 . . 200 200 . . .. S S = 260,4167 kg= 260,4167 kg
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TUGAS DESAIN DAN
TUGAS DESAIN DAN ANALISA STRUKTUR JEMBAANALISA STRUKTUR JEMBATAN KAYU TAN KAYU 20092009 Jarak – jarak baut
Jarak – jarak baut 2d = 2 . (1) = 2 2d = 2 . (1) = 2 33 3d = 3 . (1) = 3 3d = 3 . (1) = 3 44 5d = 5 . (1) = 5 5d = 5 . (1) = 5
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S S rr = = 1,25 1,25 . . 200 200 . . .. S S rr= 260,4167 kg= 260,4167 kg
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TUGAS DESAIN DAN ANALISA STRUKTUR JEMBAANALISA STRUKTUR JEMBATAN KAYU TAN KAYU 20092009
SAMBUNGAN – J SAMBUNGAN – J batang d batang d 3 3= 893,85 kg= 893,85 kg
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