BAB IV Perencanaan Kuda-Kuda Baja

(1)

BAB IV

PERENCANAAN KUDA-KUDA

4.1

4.1 PerencanPerencanaan aan PembebanaPembebanann 4.

4.1.1.11 PPerereennccananaaaan Ben Bebbaan Mn Matatii

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

Data :

-- PPaannjjaanng g BBaattaanng g 11 = = 11,,774444! ! mm -- PaPanjnjanang g BaBatatang ng 28 28 = = 1,1,42428181! ! mm -- BBee""aat t PP""oo##iil l $$%%dda a & & $$%%ddaa = = '',,''! ! (())**mm -- JaJa"a"a( ( AAntnta" a" $$%%da da - - $%$%da da = = + + mm

-- BeBe"a"at t P"P"o#o#il il oo"d"dining g = = ',','+'+1 1 ()()*m*m -- BBee""aat t eenntteenngg = = '',,! ! (())**mm -- BBee""aat t PPllaa##oonn = = '',,1188(())**mm -- ..%%aa/ / PPeenn%%tt%%p p AAttaap p JJooiinnt t AA = != !,,22  mm -- ..%%aa/ / PPllaa##oon n JJooiinnt t AA = = 44,,22884 4 mm Ditan0a(an :

Ditan0a(an :

-- BBee""aat Pt P""oo#i#il l eennddii""ii -- BBee""aat Pt Peenn%%tt%%p ap attaapp -- BBee""aat t oo""ddiinngg

-- BeBe"a"at Bt Bebeban an MaMati ti ootatall Pen0ele/aian :

Pen0ele/aian : 1.

1. PerhPerhitungitungan Bean Berat Prat Proroi! "eni! "en#iri $ B#iri $ Beraerat Rant Rang%a &g%a &

= Be"at P"o#il $%da - $%da 3  ',! 3 P5Batang 1 6 ',! 3 P5Batang 28  32 = Be"at P"o#il $%da - $%da 3  ',! 3 P5Batang 1 6 ',! 3 P5Batang 28  32 =  ','! 3 

=  ','! 3  ',! 3 1,744! 6 ',! 3 1,4281!  3 ',! 3 1,744! 6 ',! 3 1,4281!  3 22 =

= ',1!8! ',1!8! ()() '.

'. PerhPerhitungitungan Beran Berat "eat "en#iri Kn#iri Ku#a ( Ku#a ( Ku#a $ Bu#a $ Berat "erat "ambuambungan &ngan & = 1'  3 Be"at 9ang(a = 1'  3 Be"at 9ang(a = 1'  3 ',1!8! = 1'  3 ',1!8! = ','1!8! () = ','1!8! () ).

). PerPerhithitungungan Bean Berat Prat Penuenutu* tu* AtAta*a* = Be"at enteng 3

= Be"at enteng 3 .%a/ A"ea Pen%t%p A.%a/ A"ea Pen%t%p Atap Joint Atap Joint A = ',! 3 !,2

= ',! 3 !,2 = 2,+1! () = 2,+1! () 4.

4. PerPerhithitungungan an BerBerat at P!aP!aonon = Be"at Pla#on 3

= Be"at Pla#on 3 .%a/ A"ea Pla#on Joint A.%a/ A"ea Pla#on Joint A = ',18 3 4,284

= ',18 3 4,284

$elompo(  * B 2'14 ; < - 1 $elompo(  * B 2'14 ; < - 1

(2)

= ',771 () = ',771 () +.

+. PerPerhithitungungan an BerBerat at ,or,or#in#ingg

= Be"at P"o#il o"ding 3 Ja"a( Anta" $%da - $%da = Be"at P"o#il o"ding 3 Ja"a( Anta" $%da - $%da

= ','+1 3 + = ','+1 3 + = ',+78 () = ',+78 () .

. PerhPerhitungitungan an BeraBerat Bt Beban eban Mati Mati oota!ta! = Be"at 9ang(a 6

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

(3)

amba" 4

amba" 45151 5151 Pe"leta(an Beban Pe"leta(an Beban Mati pada Mati pada AP AP 2''' 2'''  at%an  at%an ()*m()*m

4.

4.1.1.'' PePerrenencacananaan an BeBebaban n /i/i#u#u**

Mengambil contoh pada Joint A, Batang 1dan Batang 28 Mengambil contoh pada Joint A, Batang 1dan Batang 28 D

Daatta a ::

-- PPaannjjaanng g BBaattaanng g 11 = = 11,,774444! ! mm -- PPaannjjaanng g BBaattaanng g 2288 = = 11,,44228811! ! mm -- BBee""aat t ??""aanngg = = 1 1 (())

-- JJaa""aa( ( AAnnttaa" " $$%%dda a & & $$%%ddaa = = 22,,22! ! mm -- BBee//aa" " %%dd%%t t $$eemmii""iinnggaan n @@ = = ! !  -- .%.%a/ a/ AA"e"ea Aa Atatap Jp Joioint nt A= A= !,!,2 2 mm Pen0ele/aian : Pen0ele/aian : 1. 1. h h = =   4' 4' - - ',8 ',8 3 3 @ @  =  4' - ',8 3 !  =  4' - ',8 3 !  = 12 (g*m = 12 (g*m

Pe"hit%ngan Be"at Ai" C%jan Pe"hit%ngan Be"at Ai" C%jan

= Beban C%jan 3

= Beban C%jan 3 .%a/ A"ea A.%a/ A"ea Atap Joint Atap Joint A = 12 3 !,2 = 12 3 !,2 = ',+27+ () = ',+27+ () $elompo(  * B 2'14 ; < -  $elompo(  * B 2'14 ; < - 

(4)

'

'.. PPeerrhhiittuunnggaan n BBeebbaan n //ii##uu* * oottaa!! = Be"at ?"ang = Be"at ?"ang = 1 ()

= 1 ()

abel

abel 45152 9e(ap Beban Cid%p >45152 9e(ap Beban Cid%p >ang ang Dig%na(aDig%na(ann $ete"angan :

$ete"angan :

Beban hid%p 0ang dig%na(an diambil da"i beban te"be/a" anta"a beban h%jan dan Beban hid%p 0ang dig%na(an diambil da"i beban te"be/a" anta"a beban h%jan dan beban o"ang5

beban o"ang5

amba" 45152 Pe"leta(an Beban Cid%p pada

(5)

4.

4.1.1.)) PePerrenencacananaan an BeBebaban n AAngnginin 1.

1. BebaBeban An Angin ngin ee%an #a%an #ari Kirri Kiri #an /ii #an /i0a* #a0a* #ari Kanari Kanann Mengambil contoh pada Joint A dan Joint $

Mengambil contoh pada Joint A dan Joint $ Data :

Data : -

- ..%%aa/ / AA""eea a JJooiinnt t AA = = !!,,22' ' mm -

- ..%%aa/ / AA""eea a JJooiinnt t $$ = = !!,,22' ' mm -- ee(a(annan an AAngngin in  P PPP<< 1 187 87  = '= ',,2! 2! ()()*m*m -

- $$eemmii""iinnggaan n AAttaap p @@ = = ! !  -

- $$ooee##ii//iieen n ee((aann = =   '',,''2 2 3 3 @ @ - - '',,4 4  -

- $$ooee##ii//iieen n CCii//aapp = = --'',,44

Ditan0a(an : Ditan0a(an :

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

Pen0ele/aian : Pen0ele/aian :

a5

a5 Pe"hPe"hit%it%ngangan nt%n nt%( A( Angingin n e(e(an Bagan Bagian $iian $i"i :"i : Beban angin te(an

Beban angin te(an joint A :joint A : = .%a/an atap

= .%a/an atap joint A joint A 3 e3 e(anan angin 3  ','2 3 (anan angin 3  ','2 3 @ & ',4 @ & ',4  = !,2 3 ',2! 3  ','2 3 ! - ',4 

= !,2 3 ',2! 3  ','2 3 ! - ',4  = ',22! ()

= ',22! ()

b5

b5 Pe"hit%ngan nt%( Pe"hit%ngan nt%( Angin Ci/ap Bagian $Angin Ci/ap Bagian $anan :anan : Beban angina hi/ap joint $ :

Beban angina hi/ap joint $ : = .%a/an atap

= .%a/an atap joint $ 3 e(anan angin 3  -',4 joint $ 3 e(anan angin 3  -',4  = !,2 3 ',2! 3  -',4 

= !,2 3 ',2! 3  -',4 

$elompo(  * B 2'14 ; < - ! $elompo(  * B 2'14 ; < - !

(6)

= -',!2 () = -',!2 ()

(7)

'.

'. BebaBeban An Angin ngin ee%an #a%an #ari Kanri Kanan #an /an #an /i0a* #i0a* #ari Kirari Kirii Mengambil contoh pada Joint $

Mengambil contoh pada Joint $ dan Joint Adan Joint A Data :

Data : -

- ..%%aa/ / AA""eea a JJooiinnt t $$ = = !!,,22' ' mm -

- ..%%aa/ / AA""eea a JJooiinnt t AA = = !!,,22' ' mm - 

- ee(a(ananan n AAngngin in  P PP<P<  1187 87  = '= ',2,2! ! ()()*m*m -

- $$eemmii""iinnggaan n AAttaap p @@ = = ! !  -

- $$ooee##ii//iieen n ee((aann = =   '',,''2 2 3 3 @ @ - - '',,4 4  -

- $$ooee##ii//iieen n CCii//aapp = = --'',,44

Ditan0a(an : Ditan0a(an :

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

Pen0ele/aian : Pen0ele/aian :

a5

a5 Pe"hitPe"hit%ngan %ngan nt%nt%( ( AngAngin in e(ae(an Bagn Bagian $ian $anan anan :: Beban angina te(an joint $ :

Beban angina te(an joint $ : = .%a/an atap

= .%a/an atap joint $ 3 e(anan angin 3  ','2 3 @ -',4 joint $ 3 e(anan angin 3  ','2 3 @ -',4  = !,2 3 ',2! 3  ','2 3 ! & ',4 

= !,2 3 ',2! 3  ','2 3 ! & ',4  = ',22! ()

= ',22! ()

b5

b5 Pe"hit%ngan nt%( Pe"hit%ngan nt%( Angin Ci/ap Bagian $Angin Ci/ap Bagian $i"i :i"i : Beban angin hi/ap

Beban angin hi/ap joint A :joint A : = .%a/an

= .%a/an atap joint A 3 atap joint A 3 e(anan angin 3  e(anan angin 3  -',4 -',4  = !,2 3 ',2! 3  -',4  = !,2 3 ',2! 3  -',4  = -',!2 () = -',!2 () $elompo(  * B 2'14 ; < - 7 $elompo(  * B 2'14 ; < - 7

(8)

abel 4515 9e(ap Beban Angin >ang Dig%na(an 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" 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 amba" 45154 Pe"leta(an Beban Angin $anan pada AP 2'''  at%an ()*m

(9)

4.'

4.' Ana!i0a Kombina0i Ana!i0a Kombina0i Beban "AP Beban "AP '' 15

15 $o$ombmbinina/a/i 1  1i 1  1,4 D,4 Dead ead .o.oad ad 

amba"

amba" 45251 45251 ?%tp%t ?%tp%t a0a a0a A3ial A3ial Eo"ce Eo"ce $ombina/i $ombina/i 1 1   at%an at%an ()*m ()*m 

25

25 $om$ombinbina/i 2  1a/i 2  1,2 De,2 Dead .oad .oad 6 1,ad 6 1,+ .iF+ .iFe .oae .oad d 

amba" 45252 ?%tp%t a0a A3ial Eo"ce $ombina/i 2 

amba" 45252 ?%tp%t a0a A3ial Eo"ce $ombina/i 2  at%an ()*m at%an ()*m 

5

5 $omb$ombina/i  ina/i   1,2  1,2 Dead .Dead .oad 6 1oad 6 1,+ .i,+ .iFe .oaFe .oad 6 ',8 d 6 ',8 .e#t G.e#t Gind ind 

$elompo(  * B 2'14 ; < -  $elompo(  * B 2'14 ; < - 

(10)

amba"

amba" 4525 4525 ?%tp%t ?%tp%t a0a a0a A3ial A3ial Eo"ce Eo"ce $ombina/i $ombina/i     at%an at%an ()*m ()*m  45

45 $omb$ombina/i 4 ina/i 4  1,2  1,2 Dead .Dead .oad 6 1oad 6 1,+ .i,+ .iFe .oaFe .oad 6 ',8 d 6 ',8 9ight 9ight GiGind nd  amba"

amba" 45254 45254 ?%tp%t ?%tp%t a0a a0a A3ial A3ial Eo"ce Eo"ce $ombina/i $ombina/i 4 4   at%an at%an ()*m ()*m 

!5

(11)

amba"

amba" 4525! 4525! ?%tp%t ?%tp%t a0a a0a A3ial A3ial Eo"ce Eo"ce $ombina/i $ombina/i ! !   at%an at%an ()*m ()*m  +5

+5 $omb$ombina/i + ina/i +  ',  ', Dead .Dead .oad 6 oad 6 1, 91, 9ight ight GiGind nd  amba"

amba" 4525+ 4525+ ?%tp%t ?%tp%t a0a a0a A3ial A3ial Eo"ce Eo"ce $ombina/i $ombina/i + +   at%an at%an ()*m ()*m 

$elompo(  * B 2'14 ; < - 11 $elompo(  * B 2'14 ; < - 11

(12)

a

(13)

4.)

4.) Ana!i0a Ana!i0a Penam*ang Penam*ang Ku#a-Ku#aKu#a-Ku#a 15

15 $on$ont"ot"ol Pe"l Pe"hithit%ng%ngan Ban Batanatang Ag Ata/ta/



 _e(an_e(an

amba" 4551 .eta( Batang + amba" 4551 .eta( Batang + Data :

Data : )% 

)% e(ane(an : 7',!+ (): 7',!+ () P

Paannjjaanng g BBaattaanngg ::22444411,,!!! ! mmmm Dig%na(an m%t% baja 7

Dig%na(an m%t% baja 7  EE%% : : 77' ' MMppaa E

E00 : : 2244' ' MMppaa H

H : : 22''''''''' ' MMppaa a5

a5 DiDicocobba a pp"o"o#i#ill Double A Double Angle 65.65.5ngle 65.65.5 Data p"o#il : Data p"o#il : A Agg// = = ++++,,7 7 mmmm <<33 = = 22!!''''' ' mmmm⁴⁴ < < mmiinn = = 2 2 3 3 <<33 = 2 3 2!''' = 2 3 2!''' = !'+''' mm = !'+''' mm⁴⁴ A Agg = = 2 2 3 3 AAgg// = 2 3 ++,7 = 2 3 ++,7 = 127,4 mm = 127,4 mm

"

minmin ==

√√

Imin Imin Ag Ag = =

√√

506000 506000 1273,4 1273,4 = 1, mm = 1, mm b5 Pe"hit%ngan Batang b5 Pe"hit%ngan Batang

- Ie( $elang/ingan dipa(ai ( = 1 - Ie( $elang/ingan dipa(ai ( = 1

Lk Lk rmin rmin 2''2'' 2441,55 2441,55 x x11 19,93 19,93   2''2'' 1 12222,,!!1 1   22'''' KK2K 2K -- Ie( $apa/ita/ P"o#ilIe( $apa/ita/ P"o#il

$elompo(  * B 2'14 ; < - 1 $elompo(  * B 2'14 ; < - 1

(14)

 c =c = 1 1 π π xx Lk Lk rmin rmin xx

√√

fy fy E E  c =c = 1 1 3,14 3,14 x x122,51122,51 x x

√√

240 240 200000 200000  c = 1,!c = 1,! c L 1,2!c L 1,2! Ma Ma((a a ""%m%m%%/ /  == 1,251,25× λ× λ cc22 = 1,2! = 1,2! ×× 1,351,3522 = 2,28 = 2,28 )n )n  N)nN)n 7 7'',,!!+ + (())  0,850,85 x Ag x Ag xx f fyy ω ω 7 7'',,!!+ + (())  0,850,85 x x1273,41273,4 x x 240 240 2,28 2,28 7 7'',,!!+ + (())  1111,,4 4 (() ) KK AmanAman Jadi,

Jadi, profil 2L profil 2L 65.65.5 aman d65.65.5 aman digunakan pada bigunakan pada batang atang atasatas -- IIee( ( 99aattiioo

e

egangan te(an gangan te(an te"jadite"jadi O O == Nu Nu Ag Ag = = 70560 70560 1273,4 1273,4 = !!,41 )*mm = !!,41 )*mm e

egangan te(an gangan te(an "encana"encana O O == 0,850,85 x x fy fy ω ω = = 0,850,85 x x 240 240 2,28 2,28 = 8,47 )*mm = 8,47 )*mm 9 9aattiioo == 55,41 55,41 89,47 89,47 = ',+2  1 K5 = ',+2  1 K5 2K 2K Jadi

Jadi33 Profil 2L 65.65.5 efisien untuk digunakan. Profil 2L 65.65.5 efisien untuk digunakan.



(15)

amba" 4552

amba" 4552 .eta( Batang .eta( Batang 22 Data :

Data : )% 

)% a"i(a"i( : 21,44 (): 21,44 () P

Paannjjaanng g BBaattaanngg : 1: 17744,,44! ! mmmm Dig%na(an m%t% baja 7

Dig%na(an m%t% baja 7  E% : 7' MPaE% : 7' MPa E0 : 24' MPa E0 : 24' MPa H

H : : 2''''' 2''''' MpaMpa aa55 DDiiccoobba pa p""oo##iill Double Angle 40.40.4 Double Angle 40.40.4

Data p"o#il : Data p"o#il : A Agg// = = 22,,+ + mmmm <<33 = = !!''' ' mmmm⁴⁴ A Agg = = 2 2 3 3 AAgg// = 2 3 2,+ = 2 3 2,+ = 4+7,2 mm = 4+7,2 mm A Aee = = AAgg5 5  = 8!5Ag 3 ', K = 8!5Ag 3 ', K )< '-172-2''2)< '-172-2''2 = ',7+!Ag = ',7+!Ag = !7,4'8 mm = !7,4'8 mm b5

b5 Pe"hit%ngan BatangPe"hit%ngan Batang -- IIee( ( $$aappaa//iittoo" "

1 155 NN))nn = = '',,  3 3 AAg g 3 3 ##00 N N))nn = = '',,  3 3 44++77,,2 2 3 3 2244'' N N))nn = = 11''''11!!,,2 2 )) N N))nn = = 11'''',,2 2 (()) )% )%  N)nN)n 2 211,,4444  11'''',,2 2 KK5 5 ??$ $ 2 255 NN))nn = = '',,77! ! 3 3 AAe e 3 3 ##%% N N)n)n = '= ',7,7! 3 ! 3 !7!7,4,4''8 8 3 3 77'' N N))nn = = 1188'',,772 2 )) N N))nn = = ,,118 8 (()) )% )%  N)nN)n )% )%  ,18 K5 ?$ ,18 K5 ?$ -- IIee( ( $$eellaanngg//iinnggaann

$elompo(  * B 2'14 ; < - 1! $elompo(  * B 2'14 ; < - 1!

(16)

<<33gg = = 2 2 3 3 <<33 = 2 3 !'' = 2 3 !'' = 7'+'' mm = 7'+'' mm⁴⁴ 9

9mmiinn ==

√√

Imin Imin_Ag_Ag = =

√√

70600 70600 467,2 467,2 = 12,2 mm = 12,2 mm   == _Rmin_Rmin L L ≤≤ 224400 = = 1743,45 1743,45 12,29 12,29 ≤≤ 224400 = = 114411,,8866 ≤≤ 22440 0 ……... . OOK K Jadi,

Jadi, profil 2L profil 2L 40.40.4 A40.40.4 Aman digunakan man digunakan ..

-- IIee( ( 99aattiioo e

egangan te(an gangan te(an te"jadite"jadi O O == Nu Nu Ag Ag = = 21440 21440 467,2 467,2 = 4!,8 )*mm = 4!,8 )*mm e

egangan te(an gangan te(an "encana"encana O O = = Q Q 3 3 ##00 = ', 3 24' = ', 3 24' = 21+ )*mm = 21+ )*mm 9 9aattiioo == 45,89 45,89 216 216 = ',21  1 K5 = ',21  1 K5 2K 2K 25

25 $on$ont"ot"ol Pe"hl Pe"hit%it%ngangan Batan Batang ng enengahgah



amba"

(17)

Data : Data : )% 

)% e(ane(an : !2,+ (): !2,+ () P

Paannjjaanng g BBaattaanngg ::22''''' ' mmmm Dig%na(an m%t% baja 7

Dig%na(an m%t% baja 7  EE%% : : 77' ' MMppaa E

E00 : : 2244' ' MMppaa H

H : : 22''''''''' ' MMppaa b5

b5 Dicoba p"o#ilDicoba p"o#il Double A Double Angle 50.50.4ngle 50.50.4 Data p"o#il : Data p"o#il : A Agg// = = 88!!,,2 2 mmmm <<33 = = ''++''' ' mmmm⁴⁴ < < mmiinn = = 2 2 3 3 <<33 = 2 3 '+'' = 2 3 '+'' = 1812'' mm = 1812'' mm⁴⁴ A Agg = = 2 2 3 3 AAgg// = 2 3 8!,2 = 2 3 8!,2 = 77',4 mm = 77',4 mm

"

minmin ==

√√

Imin Imin Ag Ag = =

√√

181200 181200 770 770,,44 = 1!,4 mm = 1!,4 mm b5 Pe"hit%ngan Batang b5 Pe"hit%ngan Batang

Lk Lk rmin rmin 2''2'' 2000 2000 x x11 15,34 15,34   2''2'' 1 1'',,8 8   22'''' KK2K 2K -- Ie( $apa/ita/ P"o#ilIe( $apa/ita/ P"o#il

√√

fy fy E E  c =c = 1 1 3,14 3,14 x x11 3030,,3838 x x

√√

240 240 200000 200000  c = 1,44c = 1,44 c L 1,2!c L 1,2! Ma Ma((a a ""%m%m%%/ /  == 1,251,25× λ× λ cc22 = 1,2! = 1,2! ×× 1,441,4422 = 2,! = 2,! )n )n  N)nN)n $elompo(  * B 2'14 ; < - 17 $elompo(  * B 2'14 ; < - 17

(18)

! !22,,++  (())  0,850,85 x Ag x Ag xx f fyy ω ω ! !22,,++  (())  0,850,85 x x770,4770,4 x x 240 240 2,59 2,59 ! !22,,++  (())  ++'',,++8 8 (() ) KK AmanAman Jadi,

Jadi, profil 2L profil 2L 50.50.4 aman d50.50.4 aman digunakan pada bigunakan pada batang tengahatang tengah -- IIee( ( 99aattiioo

e

egangan te(an gangan te(an te"jadite"jadi O O == Nu Nu Ag Ag = = 52690 52690 770,4 770,4 = +8, )*mm = +8, )*mm e

egangan te(an gangan te(an "encana"encana O O == 0,850,85 x x fy fy ω ω = = 0,850,85 x x 240 240 2,59 2,59 = 78,7+ )*mm = 78,7+ )*mm 9 9aattiioo == 68,39 68,39 78,76 78,76 = ',87  1 K5 = ',87  1 K5 2K 2K Jadi

Jadi33 Profil 2L 50.50.4 efisien untuk digunakan Profil 2L 50.50.4 efisien untuk digunakan 5

5 $on$ont"ot"ol Pel Pe"hi"hit%nt%ngan gan BatBatang ang BaRBaRahah



amba"

amba" 4554 4554 .eta( .eta( Batang Batang '' Data :

Data : )% 

)% e(ane(an : 2!,2+ (): 2!,2+ () P

Paannjjaanng g BBaattaanngg ::22444411,,!!! ! mmmm Dig%na(an m%t% baja 7

(19)

c5

c5 DiDicocobba a pp"o"o#i#ill Double A Double Angle 45.45.4ngle 45.45.4 Data p"o#il : Data p"o#il : A Agg// = = 44,,2 2 mmmm <<33 = = ++!!''''' ' mmmm⁴⁴ < < mmiinn = = 2 2 3 3 <<33 = 2 3 +!''' = 2 3 +!''' = 1'''' mm = 1'''' mm⁴⁴ A Agg = = 2 2 3 3 AAgg// = 2 3 4,2 = 2 3 4,2 = +8,4 mm = +8,4 mm

"

minmin ==

√√

Imin Imin Ag Ag = =

√√

130000 130000 698,4 698,4 = 1,+4 mm = 1,+4 mm b5 Pe"hit%ngan Batang b5 Pe"hit%ngan Batang

Lk Lk rmin rmin 2''2'' 2441,55 2441,55 x x11 13,64 13,64   2''2'' 1 17788,,    22'''' KK2K 2K -- Ie( $apa/ita/ P"o#ilIe( $apa/ita/ P"o#il

√√

fy fy E E  c =c = _3,14_3,1411 x x178,99178,99 x x

√√

₂₀₀₀₀₀₂₀₀₀₀₀240240  c = 1,7c = 1,7 c L 1,2!c L 1,2! Ma Ma((a a ""%m%m%%/ /  == 1,251,25× λ× λ cc22 = 1,2! = 1,2! ×× 1,971,9722 = 4,8! = 4,8! )n )n  N)nN)n 2 2!!,,22+ + (())  0,850,85 x Ag x Ag xx f fyy ω ω 2 2!!,,22+ + (())  0,850,85 x x698,4698,4 x x 240 240 4,85 4,85 $elompo(  * B 2'14 ; < - 1 $elompo(  * B 2'14 ; < - 1

(20)

2

2!!,,22+ + (())  22,,8 8 (() ) KK AmanAman Jadi,

Jadi, profil 2L profil 2L 65.65.5 aman d65.65.5 aman digunakan pada bigunakan pada batang bawahatang bawah -- IIee( ( 99aattiioo

e

egangan te(an gangan te(an te"jadite"jadi O O == Nu Nu Ag Ag = = 25260 25260 698,4 698,4 = +,17 )*mm = +,17 )*mm e

egangan te(an gangan te(an "encana"encana O O == 0,850,85 x x fy fy ω ω = = 0,850,85 x x 240 240 4,85 4,85 = 42,'+ )*mm = 42,'+ )*mm 9 9aattiioo == 36,17 36,17 42,06 42,06 = ',8+  1 K5 = ',8+  1 K5 2K 2K Jadi

Jadi33 Profil 2L 45.45.4 efisien untuk digunakan. Profil 2L 45.45.4 efisien untuk digunakan. 4.4 Kontro! De!e%0i

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

(21)

amba" 45452

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

$ont"ol de#le(/i 0ang te"jadi

¿ ¿_δ_δ<< LL 240 240 ¿ ¿_9,99_9,99<<1200012000 240 240 ¿ ¿_9,99_9,99<<₅₀₅₀ Aman Aman SS P"o#il Aman te"hadap de#le(/i 0ang te"jadi5 P"o#il Aman te"hadap de#le(/i 0ang te"jadi5

$elompo(  * B 2'14 ; < - 21 $elompo(  * B 2'14 ; < - 21