BAB IV Perencanaan Kuda-Kuda Baja

`Laporan Praktikum Kerja Struktur Baja | 2016

BAB IV PERENCANAAN KUDA-KUDA

4.1 Perencanaan Perencanaan Pembebanan Pembebanan 4.1. 4.1.1 1 Pere erencana anaan Beb Beban Mat Matii

Mengambil contoh pada Joint A, Batang 1 dan Batang 28 Data : -

Panjang Batang 1 Panj Panjan ang g Bata Batang ng 28 Be"at P"o#il $%da & $%da Ja"a Ja"a( ( Anta" nta" $%da - $%da $%da Be"a Be"att P"o# P"o#il il o"d o"din ing g Be"at enteng Be"at Pla#on .%a/ Pen%t%p Atap Joint A .%a/ Pla#on Joint A

= 1,744! m = 1,42 1,4281 81! !m = ','! ()*m =+m = ','+ ','+1 1 ()*m ()*m = ',! ()*m = ',18()*m = !,2 m = 4,284 m

Ditan0a(an : -

Be"at Be"at Be"at Be"a Be"att

P" P"o#il #il e endi"i Pe Pen%t%p at atap o o"ding Beb Beban an Mati Mati otal tal

Pen0ele/aian : 1. Perhitung Perhitungan an Berat Berat Pro Proi! i! "en#iri "en#iri $ Bera Beratt Rang%a Rang%a &

= Be"at P"o#il $%da - $%da 3  ',! 3 P5Batang 1 6 ',! 3 P5Batang 28  32 =  ','! 3  ',! 3 1,744! 6 ',! 3 1,4281!  3 2 = ',1!8! () '. Perhitung Perhitungan an Berat Berat "en#iri "en#iri Ku#a Ku#a ( Ku#a Ku#a $ Berat Berat "ambu "ambungan ngan &

= 1'  3 Be"at 9ang(a = 1'  3 ',1!8! = ','1!8! ()

). Perhit Perhitung ungan an Berat Berat Penu Penutu* tu* Ata* Ata*

= Be"at enteng 3 .%a/ A"ea Pen%t%p Atap Atap Joint A = ',! 3 !,2 = 2,+1! () 4. Perhit Perhitung ungan an Ber Berat at P!aon P!aon = Be"at Pla#on 3 .%a/ A"ea Pla#on Joint A = ',18 3 4,284

$elompo(  * B 2'14 ; < - 1


= ',771 () +. Perhit Perhitung ungan an Ber Berat at ,or#in ,or#ing g

= Be"at P"o#il o"ding 3 Ja"a( Anta" $%da - $%da = ','+1 3 + = ',+78 () . Perhitung Perhitungan an Berat Berat Beban Beban Mati ota!

= Be"at 9ang(a 6 Be"at amb%ngan amb%ngan 6 Be"at Pen%t%p Pen%t%p Atap Atap 6 Be"at Pla#on 6 Be"at o"ding = ',1!8! 6 ','1!8! ','1!8! 6 2,+1! 6 ',771 6 ',+78 = ,28 ()

abel 45151 9e(ap Beban Mati otal otal >ang >ang Dig%na(an Dig%na(a n $elompo(  * B 2'14 ; < - 2


amba" 45151 45151 Pe"leta(an Beban Mati pada AP 2'''  at%an ()*m

4.1. 4.1.' '

Per Perenca encana naan an Be Beba ban n /i#u /i#u* *

Mengambil contoh pada Joint A, Batang 1dan Batang 28 Data -

:

Panjang Batang 1 = 1,744! m Panjang Batang 28 = 1,4281! m Be"at ?"ang = 1 () Ja"a( Anta" $%da & $%da = 2,2! m Be/a" %d%t $emi"ingan @ = !  .%a/ .%a/ A"ea "ea Ata Atap p Joi Joint nt A= !,2 !,2 m

Pen0ele/aian : 1. h

=  4' - ',8 3 @  =  4' - ',8 3 !  = 12 (g*m

Pe"hit%ngan Be"at Ai" C%jan = Beban C%jan 3 .%a/ A"ea Atap Atap Joint A = 12 3 !,2 = ',+27+ ()

$elompo(  * B 2'14 ; < - 


'.

Perhitungan Beban /i#u* ota!

= Be"at ?"ang = 1 ()

abel 45152 9e(ap Beban Cid%p >ang >ang Dig%na(an Dig%na(a n $ete"angan : Beban hid%p 0ang dig%na(an diambil da"i beban te"be/a" anta"a beban h%jan dan beban o"ang5

amba" 45152 Pe"leta(an Beban Cid%p pada AP 2'''  at%an ()*m 

$elompo(  * B 2'14 ; < - 4


4.1. 4.1.) )

Per Perenca encana naan an Be Beba ban n Angin ngin

1. Beban Beban Angin Angin e e%an #ari #ari Kiri Kiri #an /i0a* /i0a* #ari #ari Kanan Kanan

Mengambil contoh pada Joint A dan Joint $ Data

:

- .%a/ A"ea Joint A

= !,2' m

- .%a/ A"ea Joint $

= !,2' m

(anan Angin ngin  PP PP< < 1 187  - e(an

= ', ',2! ()*m ()*m

- $emi"ingan Atap @

= ! 

- $oe#i/ien e(an

=  ','2 3 @ - ',4 

- $oe#i/ien Ci/ap

= -',4

Ditan0a(an : - Beban Angin $i"i e(an - Beban Angin $i"i Ci/ap

Pen0ele/aian : a5 Pe"hit% Pe"hit%nga ngan n nt%( nt%( Angi Angin n e( e(an an Bagian Bagian $i"i $i"i : Beban angin te(an joint A : = .%a/an atap joint A 3 e(anan e(anan angin 3  ','2 3 @ & ',4  = !,2 3 ',2! 3  ','2 3 ! - ',4  = ',22! ()

b5 Pe"hit%ngan nt%( Angin Ci/ap Bagian $anan $anan : Beban angina hi/ap joint $ : = .%a/an atap joint $ 3 e(anan angin 3  -',4  = !,2 3 ',2! 3  -',4  $elompo(  * B 2'14 ; < - !


= -',!2 ()

$elompo(  * B 2'14 ; < - +


'. Beban Beban Angin Angin e e%an #ari #ari Kanan Kanan #an /i0a* /i0a* #ari #ari Kiri Kiri

Mengambil contoh pada Joint $ dan Joint A Data

:

- .%a/ A"ea Joint $

= !,2' m

- .%a/ A"ea Joint A

= !,2' m

- e e(ana (anan n Angin ngin  PP< PP<  187 187 

= ',2 ',2! ! ()*m ()*m

- $emi"ingan Atap @

= ! 

- $oe#i/ien e(an

=  ','2 3 @ - ',4 

- $oe#i/ien Ci/ap

= -',4

Ditan0a(an : - Beban Angin $anan e(an - Beban Angin $anan Ci/ap

Pen0ele/aian : a5 Pe"hit%ngan Pe"hit%ngan nt%( nt%( Angin Angin e(a e(an n Bagian Bagian $anan $anan : Beban angina te(an joint $ : = .%a/an atap joint $ 3 e(anan angin 3  ','2 3 @ -',4  = !,2 3 ',2! 3  ','2 3 ! & ',4  = ',22! ()

b5 Pe"hit%ngan nt%( Angin Ci/ap Bagian $i"i $i"i : Beban angin hi/ap joint A : = .%a/an atap joint A 3 e(anan e(anan angin 3  -',4  = !,2 3 ',2! 3  -',4  = -',!2 ()

$elompo(  * B 2'14 ; < - 7


abel 4515 9e(ap Beban Angin >ang Dig%na(an

amba" 4515 Pe"leta(an Beban Angin $i"i pada AP 2'''  at%an ()*m 

amba" 45154 Pe"leta(an Beban Angin $anan pada AP 2'''  at%an ()*m

$elompo(  * B 2'14 ; < - 8


4.' Ana!i0a Kombina0i Beban "AP ' 15 $omb $ombin ina/ a/ii 1  1,4 1,4 Dead Dead .oad .oad 

amba" 45251 ?%tp%t a0a A3ial Eo"ce $ombina/i 1  at%an ()*m  25 $ombin $ombina/i a/i 2  1,2 1,2 Dead Dead .oad .oad 6 1,+ 1,+ .iFe .iFe .oad .oad  amba" 45252 ?%tp%t a0a A3ial Eo"ce $ombina/i 2  at%an ()*m 

5 $ombina/i $ombina/i   1,2 Dead .oad .oad 6 1,+ 1,+ .iFe .iFe .oad .oad 6 ',8 .e#t Gind Gind 

$elompo(  * B 2'14 ; < - 


amba" 4525 ?%tp%t a0a A3ial Eo"ce $ombina/i   at%an ()*m  45 $ombina/i $ombina/i 4  1,2 Dead .oad .oad 6 1,+ 1,+ .iFe .iFe .oad .oad 6 ',8 9ight Gind Gind  amba" 45254 ?%tp%t a0a A3ial Eo"ce $ombina/i 4  at%an ()*m 

!5 $ombin $ombina/i a/i !  ', ', Dead Dead .oad .oad 6 1, 1, .e#t .e#t Gind Gind 

$elompo(  * B 2'14 ; < - 1'


amba" 4525! ?%tp%t a0a A3ial Eo"ce $ombina/i !  at%an ()*m  +5 $ombina/i $ombina/i +  ', Dead .oad .oad 6 1, 9ight 9ight Gind Gind  amba" 4525+ ?%tp%t a0a A3ial Eo"ce $ombina/i +  at%an ()*m 

$elompo(  * B 2'14 ; < - 11


abel abel 45257 9e(ap a 0a A3ial etiap $ombina/i

$elompo(  * B 2'14 ; < - 12


4.) Ana!i0a Penam*ang Ku#a-Ku#a 15 $ont"o $ont"oll Pe"hit Pe"hit%ng %ngan an Batan Batang g Ata/ Ata/  e(an

amba" 4551 .eta( Batang + Data : )% e(an e(an : 7',!+ () Panjang Batang :2441,!! mm Dig%na(an m%t% baja 7  E% : 7' Mpa E0 : 24' Mpa H : 2''''' Mpa Angle 65.65.5 a5 Dico Dicob ba p"o#i "o#ill Double Angle

Data p"o#il : Ag/ = ++,7 mm <3 = 2!''' mm⁴ < min = 2 3 <3 = 2 3 2!''' = !'+''' mm ⁴ Ag = 2 3 Ag/ = 2 3 ++,7 = 127,4 mm Imin " min = min Ag =

√ √

506000 1273,4

= 1, mm

b5 Pe"hit%ngan Batang - Ie( $elang/ingan dipa(ai ( = 1 Lk 2'' rmin 2441,55 x 1 19,93

 2''

122,!1  2'' K 2K - Ie( $apa/ita/ P"o#il

$elompo(  * B 2'14 ; < - 1


c =

c =

√

Lk fy x π rmin E 1

x

1 3,14

x 122,51 x

√

240 200000

c = 1,!  c L 1,2! Ma( Ma(a "%m% %m%/  =

1,25 × λ c

2

×

= 1,2!

1,35

2

= 2,28 )n



N)n

7',!+ ()



7',!+ ()



7',!+ ()



fy f y ω

0,85 x Ag x

0,85 x 1273,4 x

240 2,28

11,4 () K Aman

digunakan pada batang batang atas Jadi, profil 2L 65.65.5 aman digunakan

-

Ie( 9atio egangan egangan te(an te"jadi Nu O = Ag 70560

=

1273,4

= !!,41 )*mm egangan egangan te(an "encana fy 0,85 x O = ω =

0,85 x

240 2,28

= 8,47 )*mm 55,41

9atio

=

89,47

= ',+2  1 K5 2K Jadi3 Profil 2L 65.65.5 efisien untuk digunakan.  a"i(

$elompo(  * B 2'14 ; < - 14


amba" 4552 .eta( Batang 2 Data : )% a"i( a"i( : 21,44 () Panjang Batang : 174,4! mm Dig%na(an m%t% baja 7  E% : 7' MPa E0 : 24' MPa H : 2''''' Mpa a5 Dicoba p" p"o#il Double Angle 40.40.4 Data p"o#il : Ag / = 2,+ mm <3 = !'' mm ⁴ Ag = 2 3 Ag/ = 2 3 2,+ = 4+7,2 mm Ae = Ag5  = 8!5Ag 3 ', K )< '-172-2''2 = ',7+!Ag = !7,4'8 mm b5 Pe"hit%ngan Batang - Ie( $apa/ito" 15 N)n N)n N)n N)n )% 21,44 25 N)n N)n N)n N)n )% )% -

= ', 3 Ag 3 #0 = ', 3 4+7,2 3 24' = 1''1!,2 ) = 1'',2 ()  N)n  1'',2 K5 ?$ = ',7! 3 Ae 3 #% = ',7 ',7! ! 3 !7,4 !7,4' '8 3 7' 7' = 18',72 ) = ,18 ()  N)n  ,18 K5 ?$

Ie( $elang/ingan $elompo(  * B 2'14 ; < - 1!


<3g

= 2 3 <3 = 2 3 !'' = 7'+'' mm ⁴ Imin 9min = Ag

√ √

70600

=



467,2

= 12,2 mm L = Rmin

≤

240

1743,45

=

≤

12,29

= 141,86

≤

240

240 ….. OK

Aman digunakan . Jadi, profil 2L 40.40.4 Aman

-


=

467,2

= 4!,8 )*mm egangan egangan te(an "encana O = Q 3 #0 = ', 3 24' = 21+ )*mm 45,89

9atio

=

216

= ',21  1 K5 2K 25 $ont"o $ont"oll Pe"hit% Pe"hit%nga ngan n Batang Batang en engah gah  e(an amba" 4552 .eta( Batang 1

$elompo(  * B 2'14 ; < - 1+


Data : )% e(an e(an : !2,+ () Panjang Batang :2''' mm Dig%na(an m%t% baja 7  E% E0 H

: 7' Mpa : 24' Mpa : 2''''' Mpa

Angle 50.50.4 b5 Dicoba p"o#il Double Angle

Data p"o#il : Ag/ = 8!,2 mm <3 = '+'' mm ⁴ < min = 2 3 <3 = 2 3 '+'' = 1812'' mm ⁴ Ag = 2 3 Ag/ = 2 3 8!,2 = 77',4 mm Imin " min = min Ag

√ √

=

181200 770 , 4

= 1!,4 mm

b5 Pe"hit%ngan Batang - Ie( $elang/ingan dipa(ai ( = 1 Lk 2'' rmin 2000 x 1

 2''

15,34

1',8  2'' K 2K - Ie( $apa/ita/ P"o#il

c =

c =

√

Lk fy x π rmin E 1

x

1 3,14

x 1 30 , 38 x

√

240 200000

c = 1,44  c L 1,2! Ma( Ma(a "%m% %m%/  =

1,25 × λ c

= 1,2!

×

2

1,44

2

= 2,! )n



N)n $elompo(  * B 2'14 ; < - 17


!2,+ ()



!2,+ ()



!2,+ ()



fy f y ω

0,85 x Ag x

0,85 x 770,4 x

240 2,59

+',+8 () K Aman

digunakan pada batang batang tengah Jadi, profil 2L 50.50.4 aman digunakan

-


=

770,4

= +8, )*mm egangan egangan te(an "encana fy 0,85 x O = ω =

0,85 x

240 2,59

= 78,7+ )*mm 68,39

9atio

=

78,76

= ',87  1 K5 2K Jadi3 Profil 2L 50.50.4 efisien untuk digunakan 5 $ont"o $ont"oll Pe"hi Pe"hit%n t%ngan gan Batang Batang BaRah BaRah  e(an

amba" 4554 .eta( Batang ' Data : )% e(an e(an : 2!,2+ () Panjang Batang :2441,!! mm Dig%na(an m%t% baja 7  E% : 7' Mpa E0 : 24' Mpa H : 2''''' Mpa

$elompo(  * B 2'14 ; < - 18


c5 Dico Dicob ba p"o#i "o#ill Double Angle Angle 45.45.4 Data p"o#il : Ag/ = 4,2 mm <3 = +!''' mm ⁴ < min = 2 3 <3 = 2 3 +!''' = 1'''' mm ⁴ Ag = 2 3 Ag/ = 2 3 4,2 = +8,4 mm Imin " min = min Ag

√ √

=

130000 698,4

= 1,+4 mm

b5 Pe"hit%ngan Batang - Ie( $elang/ingan dipa(ai ( = 1 Lk 2'' rmin 2441,55 x 1

 2''

13,64

178,  2'' K 2K - Ie( $apa/ita/ P"o#il

c =

c =

√

Lk fy x π rmin E 1

x

1 3,14

x 178,99 x

√

240 200000

c = 1,7  c L 1,2! Ma( Ma(a "%m% %m%/  =

1,25 × λ c

= 1,2!

×

2

2

1,97

= 4,8! )n



2!,2+ ()



0,85 x Ag x



0,85 x 698,4 x

2!,2+ ()

N)n

fy f y ω 240 4,85

$elompo(  * B 2'14 ; < - 1


2!,2+ ()



2,8 () K Aman

Jadi, profil 2L 65.65.5 aman digunakan digunakan pada batang batang bawah -


=

698,4

= +,17 )*mm egangan egangan te(an "encana fy 0,85 x O = ω =

0,85 x

240 4,85

= 42,'+ )*mm 36,17

9atio

=

42,06

= ',8+  1 K5 2K Jadi3 Profil 2L 45.45.4 efisien untuk digunakan. 4.4 Kontro! De!e%0i

De#le(/i te"be/a" te"jadi pada (ombina/i 7 di Joint P /ebe/a" ,!+7 mm5

amba" 45451 De#le(/i e"be/a" Pada $ombina/i 7

$elompo(  * B 2'14 ; < - 2'


amba" 45452 Be/a"n0a De#le(/i >ang >ang e"jadi e"jadi  mm  $ont"ol de#le(/i 0ang te"jadi ¿ δ <

L 240

¿ 9,99 <

¿ 9,99 < 50

12000 240

Aman S

P"o#il Aman te"hadap de#le(/i 0ang te"jadi5

$elompo(  * B 2'14 ; < - 21

BAB IV Perencanaan Kuda-Kuda Baja

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