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PERENCANA

PERENCANAAN AN JEMBATAN PRATEGANGJEMBATAN PRATEGANG

PERENCANAAN JEMBATAN PRATEGANG PERENCANAAN JEMBATAN PRATEGANG Data Teknis P

Data Teknis Perencanaaerencanaan Jembatann Jembatan a. Jembatan

a. Jembatan Kelas

Kelas jalan jalan : : Kelas Kelas 11 Jumlah

Jumlah jalur jalur : : 2 2 jalurjalur Panjang

Panjang jembatan jembatan : : 40 40 metermeter Lebar

Lebar jembatan jembatan : : 9 9 metermeter Lebar

Lebar lantai lantai kendaraan kendaraan : : 7 7 metermeter Tipe

Tipe gelagar gelagar : : Balok Balok II Tebal

Tebal Perkerasan Perkerasan : : 5 5 cmcm

Gambar Bentang Jembatan

Gambar Bentang Jembatan

b. Trotoir b. Trotoir Jenis

Jenis konstruksi konstruksi : : Beton Beton bertulangbertulang Pipa

Pipa sandaran sandaran : : Circular Circular Hollow Hollow Sections Sections D D 60.5 60.5 mmmm Dimensi

Dimensi tiang tiang sandaran sandaran : : 20/15 20/15 cmcm Jarak

Jarak antar antar tiang tiang : : 2 2 mm Mutu beton, f‟c

Mutu beton, f‟c : 30 Mpa: 30 Mpa

Mutu

Mutu baja baja tulangan, tulangan, fy fy : : 240 240 Mpa Mpa (polos)(polos) Mutu

Mutu baja baja pipa pipa sandaran sandaran : : 1600 1600 MpaMpa Lebar

Lebar trotoir trotoir : : 100 100 cmcm Tebal

Tebal trotoir trotoir : : 25 25 cmcm Balok

Balok kerb kerb : : 20/25 20/25 cmcm Jenis

Jenis plat plat trotoir trotoir : : Beton Beton TumbukTumbuk c. Plat lantai kendaraan

c. Plat lantai kendaraan Tebal

Tebal plat plat : : 20 20 cmcm Mutu beton, f‟c

Mutu beton, f‟c : 30 Mpa: 30 Mpa

Mutu

Mutu baja baja tulangan, tulangan, fy fy : : 350 350 Mpa Mpa (ulir)(ulir) d. Gelagar

d. Gelagar Jenis

Jenis konstruksi konstruksi : : Beton Beton prategang prategang tipe tipe balok balok II Mutu beton, f‟c

Mutu beton, f‟c : 50 Mpa: 50 Mpa

Mutu

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Tipe

Tipe tendon tendon & & angkur angkur : : Angker Angker hidup hidup VSL VSL tipe tipe ScSc e. Abutment

e. Abutment Tinggi

Tinggi Abutment Abutment : : 6 6 metermeter Lebar

Lebar Abutment Abutment : : 11.6 11.6 metermeter Tipe

Tipe Abutment Abutment : : Type Type KantileverKantilever Mutu beton, f‟c

Mutu beton, f‟c : 30 Mpa: 30 Mpa

Mutu

Mutu baja baja tulangan, tulangan, fy fy : : 240 240 Mpa Mpa (polos)(polos) Mutu

Mutu baja baja tulangan, tulangan, fy fy : : 350 350 Mpa Mpa (ulir)(ulir)

Gambar Abutment

Gambar Abutment

Tegangan Yang Diijinkan (SNI 03

Tegangan Yang Diijinkan (SNI 03 – –28472847 – – 2002)2002) Tegangan Ijin Beton

Tegangan Ijin Beton PrategangPrategang

Mutu beton prategang (f‟c) 50 Mpa. Tegangan ijin sesuai dengan kondisi gaya pratekan dan

Mutu beton prategang (f‟c) 50 Mpa. Tegangan ijin sesuai dengan kondisi gaya pratekan dan

tegangan beton pada tahap beban kerja, tidak boleh melampaui nilai berikut: tegangan beton pada tahap beban kerja, tidak boleh melampaui nilai berikut: 1.

1. Keadaan awal, sesaat sesudah penyaluran gaya prategang (sebelum terjadinya kehilanganKeadaan awal, sesaat sesudah penyaluran gaya prategang (sebelum terjadinya kehilangan tegangan) (pasal 20.4.1)

tegangan) (pasal 20.4.1) 2.

2. Tegangan serat tekan terluarTegangan serat tekan terluar Untuk

Untuk Gelagar Gelagar ~Untuk ~Untuk PlatPlat f‟

f‟bb= 0.6 f‟= 0.6 f‟ccf‟f‟b‟b‟= 0.6 f‟c‟= 0.6 f‟c‟

= 0.6

= 0.6 x x 50 50 = = 0.60.6x x 3030 =

= 30 30 Mpa Mpa = = 18 18 MpaMpa ~Untuk

~Untuk Gelagar Gelagar ~Untuk ~Untuk PlatPlat 1. 1. fftt= ¼ = ¼ fft‟t‟= ¼= ¼ = ¼ = ¼x x  = ¼ = ¼x x  =

= 1.768 1.768 Mpa Mpa = = 1.369 1.369 MpaMpa 2.

2. Keadaan akhir, setelah kehilangan gaya prategang (pasal 20.4.2)Keadaan akhir, setelah kehilangan gaya prategang (pasal 20.4.2) 1.

1.Tegangan serat tekan terluarTegangan serat tekan terluar ~Untuk

~Untuk Gelagar Gelagar ~Untuk ~Untuk PlatPlat f‟

f‟bb= 0.45 f‟= 0.45 f‟cc f‟f‟b‟b‟= 0.45 f‟= 0.45 f‟c‟c‟

= 0.45

= 0.45 x x 50 50 = = 0.450.45x x 3030 =

= 22.5 22.5 Mpa Mpa = = 13.5 13.5 MpaMpa 2.

2. Tegangan serat tarik terluarTegangan serat tarik terluar ~Untuk

~Untuk Gelagar Gelagar ~Untuk ~Untuk PlatPlat f

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=

= 3.536 3.536 Mpa Mpa = = 2.739 2.739 MpaMpa 3.

3. Mutu beton pada saat peneganganMutu beton pada saat penegangan f‟ f‟cici= 0.8 f‟= 0.8 f‟cc = 0.8 = 0.8 x x 5050 = 40 Mpa = 40 Mpa

Modulus elastisitas beton Modulus elastisitas beton 1.

1. Beton prategang f‟Beton prategang f‟cc= 50 Mpa= 50 Mpa

E Ecc= 4700= 4700 = 4700 = 4700x x  = 33234.02 Mpa = 33234.02 Mpa 2.

2. Beton konvensional f‟Beton konvensional f‟c‟c‟= 30 Mpa= 30 Mpa

E Ec‟c‟= 4700= 4700 = 4700 = 4700x x  = 25742.96 Mpa = 25742.96 Mpa Dimana: E

Dimana: Ecc= modulus elastisitas beton prategang (Mpa)= modulus elastisitas beton prategang (Mpa)

E

Ec‟c‟= modulus elastisitas beton konvensional (Mpa)= modulus elastisitas beton konvensional (Mpa)

f‟

f‟cc= mutu beton prategang (Mpa)= mutu beton prategang (Mpa)

f‟

f‟c‟c‟= mutu beton konvensional (Mpa)= mutu beton konvensional (Mpa)

1.

1. Tegangan Ijin Tendon Tegangan Ijin Tendon PrategangPrategang

Digunakan tendon VSL dengan sifat-sifat: Digunakan tendon VSL dengan sifat-sifat:

 Diameter Diameter nominal nominal = = 12.5 12.5 mmmm 

 Luas Luas tampang tampang nominal nominal = = 98.7 98.7 mmmm22 

 Beban Beban putus putus minimum minimum = = 18.75 18.75 tonton = 18750 kg = 18750 kg = (18750 = (18750x x 9.81) N9.81) N = 183937.5 N = 183937.5 N 

 Beban Beban leleh leleh (20%) (20%) = = 1875018750x x 0.80.8 = 15000 kg = 15000 kg = (15000 = (15000x x 9.81) N9.81) N = 147150 N = 147150 N

Tegangan putus minimum (f

Tegangan putus minimum (fpupu) ) ==

= 1863.6 Mpa = 1863.6 Mpa Tegangan leleh (f Tegangan leleh (fpypy) ) == = 1490.88 Mpa = 1490.88 Mpa Modulus elastisitas (E

Modulus elastisitas (Ess) ) = = 200000 200000 MpaMpa

Tegangan tarik pada tendon prategang tidak boleh melampaui: Tegangan tarik pada tendon prategang tidak boleh melampaui: 1. Akibat gaya pengangkuran tendon

1. Akibat gaya pengangkuran tendon f

fpp = 0.94 f= 0.94 fpypy

= 0.94

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2. Sesaat setelah penyaluran gaya prategang 2. Sesaat setelah penyaluran gaya prategang f fpp = 0.82 f= 0.82 fpypy = 0.82 = 0.82 x x 1490.881490.88 = 1222.52 Mpa = 1222.52 Mpa

Tetapi tidak lebih dari Tetapi tidak lebih dari f fpp = 0.74 f= 0.74 fpupu = 0.74 = 0.74 x x 1863.61863.6 = 1379.06 Mpa = 1379.06 Mpa

3. Tendon pasca tarik, pada daerah angkur dan sambungan, segera setelah penyaluran gaya 3. Tendon pasca tarik, pada daerah angkur dan sambungan, segera setelah penyaluran gaya f fpp = 0.70 f= 0.70 fpupu = 0.70 = 0.70 x x 1863.61863.6 = 1304.52 Mpa = 1304.52 Mpa

Perencanaan Trotoir dan Plat Lantai Perencanaan Trotoir dan Plat Lantai Perencanaan Trotoir

Perencanaan Trotoir

Gambar Rencana Trotoir

Gambar Rencana Trotoir

Pendimensian Sandaran Pendimensian Sandaran

Sandaran direncanakan menumpu pada tiang sandaran dengan bentang 2 m, yang di Sandaran direncanakan menumpu pada tiang sandaran dengan bentang 2 m, yang di rencanakan menahan beban merata vertikal sebesar 0.75 kN/m. Direncanakan Sandaran rencanakan menahan beban merata vertikal sebesar 0.75 kN/m. Direncanakan Sandaran dengan penampang pipa bulat, data sebagai berikut:

dengan penampang pipa bulat, data sebagai berikut:   D D (diameter) (diameter) = = 60.5 60.5 mmmm   t t (tebal) (tebal) = = 3.2 3.2 mmmm   G G (berat) (berat) = = 4.52 4.52 kg/mkg/m 

 W W (momen (momen tahanan) tahanan) = = 7.84 7.84 cmcm33 

σ

σ

(tegangan (tegangan ijin) ijin) = = 1600 1600 kg/cmkg/cm22 Pembebanan: Pembebanan: ~ beban mati (qd) = 4.52 kg/m ~ beban mati (qd) = 4.52 kg/m beban ultimate qd beban ultimate qduu= 4.52= 4.52x x 1.1 1.1 = = 5 5 kg/mkg/m ~ beban hidup (ql) = 0.75 kN/m = 75 kg/m ~ beban hidup (ql) = 0.75 kN/m = 75 kg/m beban ultimate ql beban ultimate qluu= 75= 75 x x 2 2 = = 150 150 kg/mkg/m ~

~ beban beban ultimate ultimate (qu) (qu) = = qdqduu + ql+ qluu = 5 + 150

= 5 + 150 Qu = 155 kg/m Qu = 155 kg/m

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Dari hasi analisa statika dengan mengunakan program STAAD PRO, diperoleh momen Dari hasi analisa statika dengan mengunakan program STAAD PRO, diperoleh momen maksimum , yaitu sebesar 0.642 kNm.

maksimum , yaitu sebesar 0.642 kNm.   MMmaxmax= 0.642 kNm= 0.642 kNm = 6420 kgcm = 6420 kgcm  

σ

σ

== = = = 818.878 kg/cm = 818.878 kg/cm22 <<

σ =

σ =

1600 kg/cm1600 kg/cm22

Jadi, dipakai pipa baja diameter 60.5 mm sebagai sandaran. Jadi, dipakai pipa baja diameter 60.5 mm sebagai sandaran. Perencanaan Tiang Sandaran

Perencanaan Tiang Sandaran

Tiang sandaran direncanakan menerima beban terpusat dari sandaran sebesar w

Tiang sandaran direncanakan menerima beban terpusat dari sandaran sebesar wx x L, yangL, yang bekerja horisontal pada ketinggian 0.9 m dari permukaan trotoir. Direncanakan dimensi tiang bekerja horisontal pada ketinggian 0.9 m dari permukaan trotoir. Direncanakan dimensi tiang sandaran dengan lebar 15 cm, dan tinggi 20 cm, dengan asumsi tiang sandaran sebagai balok sandaran dengan lebar 15 cm, dan tinggi 20 cm, dengan asumsi tiang sandaran sebagai balok kantilever.

kantilever.

Gaya Yang Bekerja Pada Tiang Sandaran

Gaya Yang Bekerja Pada Tiang Sandaran

Pembebanan Pembebanan ~ beban mati (pd) ~ beban mati (pd) 

 berat sendiri tiang (atas/pdberat sendiri tiang (atas/pd11) = 0.15) = 0.15x x 0.20.2x x 0.650.65x x 24 24 = = 0.468 0.468 kNkN beban

beban ultimate ultimate pdpd11uu = 46.8= 46.8 x x 1.3 1.3 = = 0.6084 0.6084 kNkN

 berat sendiri tiang (bawah/pdberat sendiri tiang (bawah/pd22) = 0.15) = 0.15x x 0.20.2 x x 0.380.38x x 24 = 0.274 kN24 = 0.274 kN beban

beban ultimate ultimate pdpd22uu = 27.4= 27.4 x x 1.3 1.3 = = 0.3562 0.3562 kNkN

 berat 1 pipa sandaran (pdberat 1 pipa sandaran (pd33) = 0.0452) = 0.0452x x 2 = 0.0904 kN2 = 0.0904 kN beban

beban ultimate ultimate pdpd33uu = 0.0904= 0.0904x x 1.1 1.1 = = 0.0995 0.0995 kNkN

~

~ beban beban hidup hidup (pl) (pl) = = 0.75 0.75 kNkN beban ultimate pl

beban ultimate pluu= 0.75= 0.75 x x 2 = 1.5 kN2 = 1.5 kN Momen yang terjadi

Momen yang terjadi   MMmaxmax= pd= pd11uu x  x XX22 – – pdpd22uu x  x XX11+ pd+ pd33uu x  x XX22+ pl+ pluu x  x 90 + pl90 + pluu x  x 4545 = 0.6084 = 0.6084 x x 55 0.3562 0.3562 3.63.6

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Start Free Trial Cancel Anytime. = 2 = 2 x x 1.5 kN = 3000 N1.5 kN = 3000 N Perhitungan penulangan Perhitungan penulangan Data perencanaan: Data perencanaan: b b = = 150 150 mmmm h h = = 200 200 mmmm f‟c f‟c = 30 Mpa= 30 Mpa fy fy = = 240 240 MpaMpa

Direncanakan tulangan pokok Ø 10, sengkang Ø 6 Direncanakan tulangan pokok Ø 10, sengkang Ø 6 d

d = h= h – – selimut betonselimut beton – –ØØ sengkang

sengkang – –(½(½x x Ø Tul. Tarik)Ø Tul. Tarik) = 200 = 200 – –2020 – –66 – –(½(½x x 10)10) = 169 mm = 169 mm A. Penulangan lentur A. Penulangan lentur   Mu Mu = = 205.255 205.255 kNcm kNcm = = 205.255205.255x x 101044NmmNmm   Mn Mn = = = = 256.569256.569 x x 101044 NmmNmm   Rn Rn = = = = 0.59888 0.59888 MpaMpa   m m = = = = 9.4129.412

Rasio penulangan keseimbangan (ρb);

Rasio penulangan keseimbangan (ρb);

  ρρbb == = = = 0.0645 = 0.0645   ρρmaxmax= 0.75= 0.75x x ρρbb = 0.75 = 0.75 x x 0.0645 = 0.0483750.0645 = 0.048375   ρρminmin= = = = = = 0.0058340.005834 Rasio penulangan perlu Rasio penulangan perlu

  ρρ == = = = 0.002525 = 0.002525 ρ < ρ

ρ < ρminmin 0.002525 < 0.005834 (digunakan ρ0.002525 < 0.005834 (digunakan ρminmin))

 AsAsperluperlu= ρ= ρminmin

x bbx x dd = 0.005834

(12)

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 bbminmin= 2= 2 x x selimut beton + 2selimut beton + 2 x x ØØsengkang + nsengkang + nx x D Tul. Tarik + (nD Tul. Tarik + (n – –1)1) x x 2525 = 2

= 2 x x 40 + 240 + 2x x 6 + 26 + 2x 10 + ( 2x 10 + ( 2 – –1 )1 )x x 2525 = 137 mm < b

= 137 mm < b = 150 mm ………….( O.K )= 150 mm ………….( O.K )

  As‟ As‟tekantekan= 20 %= 20 %x x AsAsperluperlu = 0.2

= 0.2 x x 131.265 = 26.253 mm131.265 = 26.253 mm22 Dipakai tulangan 2 Ø 10 mm Dipakai tulangan 2 Ø 10 mm 

  As‟ As‟adaada= 2= 2 x x ( ¼( ¼x x ππx x ØØ22 )) = 2

= 2 x x ( ¼( ¼x x ππx x 101022 )) = 157.08 mm

= 157.08 mm22 > As‟> As‟tekantekan= 26.253 mm= 26.253 mm22………….( O.K )………….( O.K )

B. Penulangan geser B. Penulangan geser   Vc Vc = = 1/61/6x x  x  x bbx x dd = 1/6 = 1/6 x x  x  x 150150 x x 149149 = 20402.67 N = 20402.67 N   ½½

ø 

ø 

Vc Vc = = ½½x x 0.60.6x x 20402.6720402.67

= 6120.8 N > Vu = 1500 N (tidak diperlukan tulangan geser) = 6120.8 N > Vu = 1500 N (tidak diperlukan tulangan geser) Cukup dipasang sengkang praktis. Digunakan Ø 6

Cukup dipasang sengkang praktis. Digunakan Ø 6 – –150 mm yang dipasang disepanjang tiang.150 mm yang dipasang disepanjang tiang.

Gambar Penulangan Tiang Sandaran Gambar Penulangan Tiang Sandaran Perencanaan Kerb

Perencanaan Kerb

Kerb direncanakan untuk menahan beban tumbukan arah menyilang sebesar 100 kN, yang Kerb direncanakan untuk menahan beban tumbukan arah menyilang sebesar 100 kN, yang bekerja sebagai beban titik. Direncanakan kerb terbuat dari beton bertulang, dengan dimensi bekerja sebagai beban titik. Direncanakan kerb terbuat dari beton bertulang, dengan dimensi lebar 20 cm dan

lebar 20 cm dan tinggi 25 cm, menggunakan beton dengan mutu f‟c 30 Mpa, tulangan baja mututinggi 25 cm, menggunakan beton dengan mutu f‟c 30 Mpa, tulangan baja mutu

fy 240 Mpa, yang dipasang 2 Ø 10 pada masing-masing sisinya, dan sengkang Ø 6

fy 240 Mpa, yang dipasang 2 Ø 10 pada masing-masing sisinya, dan sengkang Ø 6 – –200 mm200 mm sepanjang kerb.

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Beban merata Beban merata ~

~ berat berat plat plat lantai lantai = = 0.200.20x 1x 1 x x 24 24 = = 4.8 4.8 kN/mkN/m beban

beban ultimate ultimate = = 4.84.8 x x 1.3 1.3 = = 6.24 6.24 kN/mkN/m ~

~ berat berat plat plat lantai lantai trotoir trotoir = = 0.250.25x x 11 x x 23 = 5.75 kN/m23 = 5.75 kN/m beban

beban ultimate ultimate = = 5.755.75 x x 1.3 1.3 = = 7.475 7.475 kN/mkN/m ~

~ berat berat air air hujan hujan = = 0.050.05x 1x 1 x x 10 10 = = 0.5 0.5 kN/mkN/m Beban

Beban ultimate ultimate = = 0.50.5 x x 1.2 1.2 = = 0.6 0.6 kN/m kN/m ++ qd qd11uu = = 14.315 14.315 kN/mkN/m Beban terpusat Beban terpusat pd pduu= pd= pd11uu+ pd+ pd22uu + 2.pd+ 2.pd33uu = 0.6084 + 0.3562 = 0.6084 + 0.3562 + (2 + (2 x x 0.0995)0.0995) = 1.1636 kN = 1.1636 kN 1.

1. Beban pada plat lantai kendaraanBeban pada plat lantai kendaraan ~

~ berat berat plat plat lantai lantai = = 0.200.20x 1x 1 x x 24 24 = = 4.8 4.8 kN/mkN/m beban

beban ultimate ultimate = = 4.84.8 x x 1.3 1.3 = = 6.24 6.24 kN/mkN/m ~

~ berat berat aspal aspal = = 0.050.05x x 11 x x 22 = 1.1 kN/m22 = 1.1 kN/m beban

beban ultimate ultimate = = 1.11.1 x x 1.2 1.2 = = 1.32 1.32 kN/mkN/m ~

~ berat berat air air hujan hujan = = 0.10.1x 1x 1 x x 10 10 = = 1 1 kN/mkN/m beban

beban ultimate ultimate = = 11 x x 1.2 1.2 = = 1 1 kN/m kN/m ++ qd

qd22uu = = 8.56 8.56 kN/mkN/m

1.

1. Beban mati tambahanBeban mati tambahan

Beban mati tambahan berupa pelapisan ulang lapisan aspal dengan tebal 50 mm Beban mati tambahan berupa pelapisan ulang lapisan aspal dengan tebal 50 mm ~

~ berat berat aspal aspal = = 0.050.05x x 11 x x 22 = 1.1 kN/m22 = 1.1 kN/m beban ultimate qd

beban ultimate qd33uu = 1.1= 1.1x x 2 2 = = 2.2 2.2 kN/mkN/m

 Beban hidupBeban hidup 

 Beban pada plat trotoirBeban pada plat trotoir Beban merata

Beban merata ~

~ beban beban pejalan pejalan kaki kaki = = 5 5 kPakPax x 1 m = 5 kN/m1 m = 5 kN/m beban ultimate ql beban ultimate ql11uu = 5= 5x x 2 2 = = 10 10 kN/mkN/m Beban terpusat Beban terpusat pl pluu = 1.5 kN= 1.5 kN 

 Beban pada plat lantai kendaraanBeban pada plat lantai kendaraan #

# Faktor Faktor beban beban dinamis dinamis (DLA)(DLA) K = 1 + DLA ,

K = 1 + DLA ,

Faktor beban dinamis untuk truk adalah 0.3 (BMS ‟92, hal

Faktor beban dinamis untuk truk adalah 0.3 (BMS ‟92, hal2-20)2-20) maka K = 1 + 0.3 = 1.3

maka K = 1 + 0.3 = 1.3 #

# Beban truk “T”Beban truk “T”

Beban truk “T” sebesar 200 kN, maka

Beban truk “T” sebesar 200 kN, maka tekanan untuk satu roda:tekanan untuk satu roda:

P Puu ==

(16)

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Gambar Skema Pembebanan Kondisi II

Gambar Skema Pembebanan Kondisi II

 Kondisi IIIKondisi III

Gambar Skema Pembebanan Kondisi III

Gambar Skema Pembebanan Kondisi III

 Kondisi IVKondisi IV

Gambar Skema Pembebanan

Gambar Skema Pembebanan

Kondisi IV

Kondisi IV

 Kondisi VKondisi V

Gambar Skema Pembebanan Kondisi V

Gambar Skema Pembebanan Kondisi V

 Kondisi VIKondisi VI

Gambar Skema Pembebanan

Gambar Skema Pembebanan

Kondisi VI

Kondisi VI

Penulangan Plat Lantai

Penulangan Plat Lantai KendaraanKendaraan

Dari hasi analisa statika dengan mengunakan program STAAD PRO, diperoleh momen Dari hasi analisa statika dengan mengunakan program STAAD PRO, diperoleh momen maksimum pada kondisi II, yaitu:

maksimum pada kondisi II, yaitu: 

 MMmaxmaxtumpuan tumpuan = = 77.976 77.976 kNmkNm 

 MMmaxmaxlapangan lapangan = = 71.471 71.471 kNmkNm Data perencanaan: Data perencanaan: f‟c f‟c = 30 Mpa= 30 Mpa fy fy = = 350 350 MpaMpa Tebal

(18)

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 m m = = = = 13.725513.7255 Rasio penulangan keseimbangan (ρb);

Rasio penulangan keseimbangan (ρb);

  ρρbb == = = = 0.0391128 = 0.0391128   ρρmaxmax= 0.75= 0.75x x ρρbb = 0.75 = 0.75 x x 0.0391128 = 0.029334590.0391128 = 0.02933459   ρρminmin= = = = = = 0.0040.004 Rasio penulangan perlu Rasio penulangan perlu

  ρρ == = = = 0.010115 = 0.010115 ρ > ρ

ρ > ρminmin 0.010115 > 0.004 (digunakan ρ)0.010115 > 0.004 (digunakan ρ)

  AsAsperluperlu= ρ= ρx x bb x x dd = 0.010115 = 0.010115x x 10001000 x x 172172 = 1739.78 mm = 1739.78 mm22

Digunakan tulangan pokok D 16 mm Digunakan tulangan pokok D 16 mm Perhitungan jarak (S) dan As

Perhitungan jarak (S) dan Asadaada

  As As = = ¼¼x x ππx x DD22 = ¼ = ¼x x ππx x 161622 = 201.06 mm = 201.06 mm22   S S == = 115.5 mm ≈ 100 mm= 115.5 mm ≈ 100 mm   AsAsadaada= = = = 2010.6 2010.6 mmmm22 Diperoleh As

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Diperoleh As

Diperoleh Asadaada> As> Asperluperlu, maka dipakai tulangan bagi Ø 10, maka dipakai tulangan bagi Ø 10 – –200200

Gambar Penulangan Plat Lantai Kendaraan

Gambar Penulangan Plat Lantai Kendaraan

Perencanaan Struktur Gelagar Perencanaan Struktur Gelagar

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Gambar Penampang Balok Prategang

Gambar Penampang Balok Prategang

Perhitungan

Perhitungan Section Properties Section Properties  Penampang Balok Tengah

Penampang Balok Tengah

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Start Free Trial Cancel Anytime.   = = = = 2891.94 2891.94 cmcm22   = = = = 35.05 35.05 cmcm   = = = = 35.05 35.05 cmcm 

 Setelah kompositSetelah komposit

Jarak efektif antar gelagar sebesar 175 cm. Karena mutu beton plat dan balok berbeda, maka Jarak efektif antar gelagar sebesar 175 cm. Karena mutu beton plat dan balok berbeda, maka lebar efektif plat komposit dengan balok prategang adalah:

lebar efektif plat komposit dengan balok prategang adalah: b

beffeff

x n (n adalah rasio perbandingan antara mutu beton, n = 0.77)n (n adalah rasio perbandingan antara mutu beton, n = 0.77) 175

175 x x 0.77 = 134.75 cm0.77 = 134.75 cm

Tabel

Tabel PerhitunganPerhitunganSection Properties Section Properties Balok Tengah Setelah KompositBalok Tengah Setelah Komposit

Bag. Bag. AA (cm (cm22)) y y (cm) (cm) A A x xyy (cm (cm33)) Momen

Momen Inersia ‘I’Inersia ‘I’ (cm

(cm44))

3

(26)

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 = = = = 45.91 45.91 cmcm Penampang Balok Ujung

Penampang Balok Ujung 1.

1. Sebelum kompositSebelum komposit

  AApp = b= bx x h h = 80= 80x x 165 165 = = 13200 13200 cmcm22   IIpp = 1/12= 1/12x x bb x x hh33 = 1/12= 1/12x x 8080 x x 16516533= 29947500 cm= 29947500 cm44   = = = = 82.5 82.5 cmcm   = 165= 165 – –82.5 82.5 = = 82.5 82.5 cmcm 1.

(28)

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Start Free Trial Cancel Anytime. Bj Bj beton beton = = 24 24 kN/mkN/m33 Bj Bj aspal aspal = = 22 22 kN/mkN/m33 Bj Bj air air = = 10 10 kN/mkN/m33

Jarak efektif antar gelagar = 175 cm = 1.75 m Jarak efektif antar gelagar = 175 cm = 1.75 m Tebal plat = 20 cm = 0.2 m Tebal plat = 20 cm = 0.2 m Tebal aspal = 5 cm = 0.05 m Tebal aspal = 5 cm = 0.05 m Tebal air = 10 cm = 0.1 m Tebal air = 10 cm = 0.1 m Luas penampang plat (A

Luas penampang plat (A11) = 1.75) = 1.75x x 0.2 = 0.35 m0.2 = 0.35 m22

Luas penampang aspal (A

Luas penampang aspal (A22) = 1.75) = 1.75x x 0.05 = 0.0875 m0.05 = 0.0875 m22

Luas penampang air (A

Luas penampang air (A33) = 1.75) = 1.75 x x 0.1 = 0.175 m0.1 = 0.175 m22

qd

qd22= Bj beton= Bj beton x x AA33+ Bj aspal+ Bj aspal x x AA22+ Bj air+ Bj airx x AA33

= 24

= 24 x x 0.35 + 220.35 + 22x x 0.0875 + 100.0875 + 10x x 0.1750.175 = 12.075 kN/m

= 12.075 kN/m 

 Akibat diafragmaAkibat diafragma Bj

Bj beton beton = = 25 25 kN/mkN/m33

Tebal diafragma (t) = 15 cm = 0.15 m Tebal diafragma (t) = 15 cm = 0.15 m

Gambar Penampang Diafragma Gambar Penampang Diafragma Luas

Luas penampang penampang (A) (A) = = (135(135x x 105)105) – –(2(2 x x (A(AIVIV+ A+ AVV))))

= 13975 cm

(30)

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Gambar Beban Yang Bekerja Pada Arah Melintang Jembatan

Gambar Beban Yang Bekerja Pada Arah Melintang Jembatan

a.

a. Besarnya beban Besarnya beban terbagi rterbagi rata (ata (UDL) UDL) tergantung pada tergantung pada panjang total panjang total yang dibebani yang dibebani (L).(L). L = 40 m > 30 m, maka: L = 40 m > 30 m, maka: q q == = = = 7 kPa = 7 kPa

Jarak efektif antar gelagar = 175 cm = 1.75 m, maka beban merata yang bekerja di sepanjang Jarak efektif antar gelagar = 175 cm = 1.75 m, maka beban merata yang bekerja di sepanjang gelagar adalah: gelagar adalah: ql ql11 = 1.75= 1.75x x qq = 1.75 = 1.75 x x 77 = 12.25 kNm = 12.25 kNm b.

b. Beban terpusat Beban terpusat P yang P yang ditempatkan tegak ditempatkan tegak lurus lurus arah lalu arah lalu lintas pada lintas pada jembatan adalahjembatan adalah sebesarnya 44.0 kN/m.

sebesarnya 44.0 kN/m.

Faktor Beban Dinamik untuk “KEL” lajur

Faktor Beban Dinamik untuk “KEL” lajur “D”“D”, untuk bentang (L, untuk bentang (LEE) = 40 m, nilai DLA = 0.4.) = 40 m, nilai DLA = 0.4.

Maka:

Maka: K K = = 1 1 + + DLADLA K = 1 + 0.4 = 1.4 K = 1 + 0.4 = 1.4

(32)

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Dimana:

Dimana: Vw Vw = = kecepatan kecepatan angin angin rencana rencana = = 30 30 m/detm/det Cw

Cw = = koefisien koefisien Seret Seret = = 1.21.2 T TEWEW = 0.0012= 0.0012x x 1.21.2 x x 303022 = 1.296 kN/m = 1.296 kN/m Analisa Statika Analisa Statika Beban Tetap Beban Tetap

Gambar Diagram Momen dan Gaya Lintang Akibat Berat Sendiri Gambar Diagram Momen dan Gaya Lintang Akibat Berat Sendiri 1.

(34)

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VA

VA =241,5 =241,5 kN kN VB VB = = 241,5 241,5 kNkN Gambar Diagram Momen dan Gaya Lintang Akibat Beban Mati

Gambar Diagram Momen dan Gaya Lintang Akibat Beban Mati

Reaksi tumpuan: Reaksi tumpuan: R RAA= R= RBB= ½= ½x x qq x x LL = ½ = ½x x 12.07512.075x x 4040 = 241.5 kN = 241.5 kN

Momen & Gaya Lintang pada setiap titik: Momen & Gaya Lintang pada setiap titik:

Momen pada titik X dengan jarak setiap 2.0 m; Momen pada titik X dengan jarak setiap 2.0 m; M

Mxx= (R= (RAA

x X)X) – –(½(½x x qqx x XX22))

Gaya Lintang pada titik X dengan jarak setiap 2.0 m; Gaya Lintang pada titik X dengan jarak setiap 2.0 m;

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Gambar Diagram Momen dan Gaya Lintang Akibat Diafragma Gambar Diagram Momen dan Gaya Lintang Akibat Diafragma 1.

1. Akibat diafragmaAkibat diafragma Reaksi tumpuan: Reaksi tumpuan: R RAA= R= RBB= ½= ½x x ∑ P∑ P = ½ = ½x x 5.245.24x x 1111 = 28.823 kN = 28.823 kN

Momen & Gaya Lintang pada setiap titik: Momen & Gaya Lintang pada setiap titik:

Momen pada titik X dengan jarak setiap 2.0 m; Momen pada titik X dengan jarak setiap 2.0 m;

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Start Free Trial Cancel Anytime. Titik 7, X = 14 m Titik 7, X = 14 m M M77= (28. 823= (28. 823x x 14)14) – –(5.24(5.24x x 14)14) – –(5.24(5.24x x 10)10) – –(5.24(5.24x 6)x 6) – –(5.24(5.24x x 2)2) = = 235.828 235.828 kNmkNm V V77 = V= V66= = 13.102 13.102 kNkN Titik 8, X = 16 m Titik 8, X = 16 m M M88= (28. 823= (28. 823x x 16)16) – –(5.24(5.24x x 16)16) – –(5.24(5.24x x 12)12) – –(5.24(5.24x x   – –(5.24(5.24 x x 4)4) = = 251.55 251.55 kNmkNm V V88 = 13.102= 13.102 – –5.245.24 = = 7.861 7.861 kNkN Titik 9, X = 18 m Titik 9, X = 18 m M M99= (28. 823= (28. 823x x 18)18) – –(5.24(5.24x x 18)18) – –(5.24(5.24x x 14)14) – –(5.24(5.24x x 10)10) – –(5.24(5.24 x x 6)6) – –(5.21(5.21x x 2)2) = = 256.791 256.791 kNmkNm V V99 = V= V88= = 7.861 7.861 kNkN Titik 10, X = 20 m Titik 10, X = 20 m M M1010= (28. 823= (28. 823 x x 20)20) – –(5.24(5.24 x x 20)20) – –(5.24(5.24 x x 16)16) – –(5.24(5.24 x x 12)12) – –(5.24(5.24 x x   – –(5.21(5.21 x x 4)4) = = 262.031 262.031 kNmkNm V V1010= 7.861= 7.861 – –5.245.24 = = 2.62 2.62 kNkN

Beban Lalu Lintas Beban Lalu Lintas

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Start Free Trial Cancel Anytime. Titik Titik 3, 3, X X = = 6 6 m m YY33 = = = = 5.1 5.1 mm A A33 = ½= ½x x 5.15.1x 40 x 40 = = 102 102 mm22 Titik Titik 4, 4, X X = = 8 8 m m YY44 = = = = 6.4 6.4 mm A A44 = ½= ½x x 6.46.4x 40 x 40 = = 128 128 mm22 Titik Titik 5, 5, X X = = 10 10 m m YY55= = = = 7.5 7.5 mm A A55 = ½= ½x x 7.57.5x 40 x 40 = = 150 150 mm22 Titik Titik 6, 6, X X = = 12 12 m m YY66= = = = 8.4 8.4 mm A A66 = ½= ½x x 8.48.4x 40 x 40 = = 168 168 mm22 Titik Titik 7, 7, X X = = 14 14 m m YY77= = = = 9.1 9.1 mm A A77 = ½= ½x x 9.19.1x 40 x 40 = = 182 182 mm22 Titik Titik 8, 8, X X = = 16 16 m m YY = = = = 9.6 9.6 mm

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Start Free Trial Cancel Anytime. V V99 = = 132.3 132.3 kNkN Titik Titik 10, 10, X X = = 20 20 m m MM1010= = 3528 3528 kNmkNm V V1010= = 107.8 107.8 kNkN 

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Start Free Trial Cancel Anytime. V VAA= = 25.92 25.92 kNkN Titik Titik 1, 1, X X = = 2 2 m m MM11 = = 49.248 49.248 kNmkNm V V11 = = 23.328 23.328 kNkN Titik Titik 2, 2, X X = = 4 4 m m MM22 = = 93.312 93.312 kNmkNm V V22 = = 20.736 20.736 kNkN Titik Titik 3, 3, X X = = 6 6 m m MM33 = = 132.192 132.192 kNmkNm V V33 = = 18.144 18.144 kNkN Titik Titik 4, 4, X X = = 8 8 m m MM44 = = 165.888 165.888 kNmkNm V V44 = = 15.552 15.552 kNkN Titik Titik 5, 5, X X = = 10 10 m m MM55 = = 194.4 194.4 kNmkNm V V55 = = 12.96 12.96 kNkN

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Start Free Trial Cancel Anytime. 1 1 2 2 3 3 4 4 5 5 6 6 77 Mo Mo MMGG MMTT 8 9 10 8 9 10 (2+3+ (2+3+ 4) 4) (5+6+7 (5+6+7 +9) +9) (kNm) (kNm) (kNm) (kNm) (kNm) (kNm) (kNm) (kNm) (kNm)(kNm) (kNm(kNm ) ) (kNm) (kNm) (kNm) (kNm) (kNm)(kNm) M MAA 0 0 0 0 0 0 0 0 653.857 653.857 0 0 0 0 00 653.85653.85 7 7

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 Tebal karet dalam = 18 mmTebal karet dalam = 18 mm 

 Tinggi keseluruhan = 92 mmTinggi keseluruhan = 92 mm 

 Beban ternilai pada perputaran nol, pada geser maksimum = 7353 kNBeban ternilai pada perputaran nol, pada geser maksimum = 7353 kN 

 Beban ternilai pada perputaran maksimum, pada geser maksimum = 3377 kNBeban ternilai pada perputaran maksimum, pada geser maksimum = 3377 kN Gaya lintang maksimum yang terjadi pada satu gelagar

Gaya lintang maksimum yang terjadi pada satu gelagar V

VUU= 1718.824 kN < V= 1718.824 kN < Vperletakanperletakan= 3377 kN ………(O.K)= 3377 kN ………(O.K)

Perencanaan Abutment Perencanaan Abutment

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Panjang

Panjang bentang bentang jembatan jembatan = = 40 40 mm Bj

Bj beton beton prategang prategang = = 25 25 kN/mkN/m33 A

App = 9200 cm= 9200 cm22 = 0.92 m= 0.92 m22

~

~ berat berat gelagar gelagar = = 55x x (40(40x x 0.920.92 x x 25) Pd25) Pd44= = 4600 4600 kNkN

3.

3. Beban diafragmaBeban diafragma Panjang

Panjang bentang bentang jembatan jembatan = = 40 40 mm Jarak

Jarak antar antar diafragma diafragma = = 4 4 mm Bj

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Gambar

Gambar Bentang JembatanGambar Bentang Jembatan b. Trotoir
Gambar AbutmentGambar Abutment
Gambar Penulangan Tiang SandaranGambar Penulangan Tiang Sandaran Perencanaan Kerb
Gambar Skema Pembebanan Kondisi IIGambar Skema Pembebanan Kondisi II
+7

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