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7.5
4
15 15
3 3 3
= 0
- RB 12 - 15 3 + 6 + 9 +
RB = 270 + 45 + 15
RB = 330
12
RB = 27.5 Ton
Dengan cara ritter melalui pot. ! "apat "i cari #e$arn%a #atang &B
12 = 0
3 - 27.5 3 =
= '2.5
3
= 27.5 Ton
R#
pa"a #atang &B #e(er)a ga%a tari( ter*a(tor Tu $e#e$ar
T, = 1.2 0.2 27.5 + 1.6 0.' 27.5
= 6.6 + 35.2
= 41.' Ton
pa"a $%arat (elang$ingan #atang tari(
Σ c
Σ D
BD
BD BD
BD
&B
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λ = / = 300 = 141.5 < 240
r min 2.12
(on"i$i lele
= φ *%
= 0.9 240 2 940
= 40.61 Ton
(on"i$i *a(tur
= 2 940 - 7 21 = 1733
&m#il , = 0.'5
= φ *%
= 0.75 370 0.'5 1733
= 40.'' Ton
)a"i = 40.'' Ton > 40.61 Ton mantap pak bad
φ Tu &g
&g mm2
φ Tu &g
φ Tu
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15
15
3
7.5 6 + 15 4 = 0
0
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r!!
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' Ton
3.5 m
13 Ton 13 Ton
2.5 m 2.5 m 2.5 m
= 0
- RB 10 - 15 2.5 + 5 + 7.5 +
RB = 225 + 40 + 15
RB = 2'0
10
RB = 2' Ton
Dengan cara ritter melalui pot. ! "apat "i cari #e$arn%a #atang &B
10 = 0
2.5 - 2' 2.5 =
= 70
2.5
= 2' Ton
R#
pa"a #atang &B #e(er)a ga%a tari( ter*a(tor Tu $e#e$ar
T, = 1.2 0.2 2' + 1.6 0.' 2'
= 6.72 + 35.'4
= 42.56 Ton
pa"a $%arat (elang$ingan #atang tari(
Σ c
Σ D
BD
BD BD
BD
&B
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λ = / = 300 = 141.5 < 240
r min 2.12
(on"i$i lele
= φ *%
= 0.9 240 2 940
= 40.61 Ton
(on"i$i *a(tur
= 2 940 - 7 21 = 1733
&m#il , = 0.'5
= φ *%
= 0.75 370 0.'5 1733
= 40.'' Ton
)a"i = 40.'' Ton > 40.61 Ton
φ Tu &g
&g mm2
φ Tu &g
φ Tu
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13 Ton
13 Ton
2.5 m
' 5 + 15 3.5 = 0
0
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CONTOH SOAL
e#ua Batang Tari( Dengan rol i(u 60 6 Tunggal "engan utu B 41 i(a Bau
itung taan tari( rencana "ari #atang ter$e#ut
a%a Tari( = 2665.39
/e#ar rol #8 = 60 mm
Te#al rol t8 = 6 mm
Tinggi Total rol g8 = 114 mm
rmin = 11.7 mm
/ua$&g8 = 691 mm
an)ang #atang /8 = 10'7.30167 mm2
% = 250 pa
*u = 410 pa
: = 200000 pa
Diameter #aut = 12.7 mm
lang(a pertiungan
a. menentukan faktor kelangsingan
λ = ≤ 300
r min
λ = 10'7.3 = 92.931' < 300
11.7
b. menghitung besarnya nilai Nu :
- n = &g %
= 691 250
= 172750
u = ϕ n
= 0.9 172750
= 155475
n = &e u
n = &n , u
&n = n t
&n = 114 - 12.7 +
= 595.'00
, = 1 - (arena
/ =
, = 0.9
n = 595.'00 0.9
n = 219'50
u = ϕ n
u = 0.75 219'50.2
u = 164'''
Diguna(an nilai u = 164''7.65
c. cek kekuatan
/.; <
mm
2
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u ≤ ϕ n
2665.39 ≤ 164''' → $%arat (e(uatan terpenui
d. cek terhadap luas bersih
/ua$ netto ≥ '5 lua$ prol
114 - 12.7 + 2 te#al >
595.' >
595.' >
e#ua #atang tari( #erupa pelat 2 158 cm "i$am#ung(an (e pelat #eru(uran 2
la$ meman)ang $epan)ang 20 cm pa"a (e"ua $i$in%a!
*% = 2400 (g>cm2
*u = 4000 (g>cm2
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#erapa #e#an rencana u %ang "apat "ipi(ul #e#an tari( ?
(arena (e"ua pelat %ang "i $am#ung ter#uat "ari #aan %ang $ama! ma(a #e#an r
ole (uat tari( plat %ang le#i (ecil lua$ penampangn%a! %aitu plat 215
(riteria "e$ain u ≤
(e(uatan platn n "itentu(an "ari (on"i$i #ata$ lele "an *ra(tur
a. plat lele
u = = 0.9 *% &g
= 0.9 2400 (g>m2
= 64.' ton
#. plat *ra(tur
u = = 0.75 *u &e
"imana
& = &g = 2 15
= 30 cm2
/>@ = 20
15
= 1.33
)a"i , "iam#il = 0.75
&e = & , 0.75
= 30 0.75
= 22.5 cm2
u = 0.75 4000 22.5
= 67.5 ton
Dari (e"ua nilai (uat rencana! u %ang menentu(an a"ala nilai %ang le#i (ecil
ga%a %ang "ipi(ul #atang tari( $epan)ang 10 meter a"ala
#e#an mati " = 50 ton
#e#an iu"up i = 40 ton
rencana(an penampang #atang tari( %ang ter#uat "ari penampang "engan
*% = 2400 (g>cm2
*u = 4000 (g>cm2
"engan (om#ina$i #e#an
1.4 "
1.2 " + 1.6 l
&@&B
mengitung #e#an
#e#an rencana u
u1 = 1.4 "
= 1.4 50
= 70 ton
u2 = 1.2 " + 1.6 l
= 1.2 50 + 1.6 40
φ n
φ n
φ n
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= 124 ton
u2 menentu(an
mengitung &g minimum
;on"i$i lele
u ≤
&g min = 124 = 57.41 cm2
0.9 24000 ton>m2
;on"i$i *ra(tur
u ≤ =
&n ≥ 124
0.75 400 100 0.9
&n ≥ 45.9259 cm2
φ Fy Ag
φ Fy Ae φ Fu An U
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t %ang "iguna(an #er"iameter 12.7
o(
2 6
era"a pa"a titi( #erat prol ma(a "iam#il
0.9 $%arat minimum 8
410
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'5 691
5'7.4
5'7.4→ $%arat lua$ terpenui
308 cm "engan
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ncana a(an "itentu(an
2 15 cm2
cm2
A 67.5 ton
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