Jumlah tulangan n n =
2
. .
4 1
d As
=
2
10 .
14 ,
3 .
4 1
5 ,
237
= 3,025 = 4 bh
Jarak tulangan s =
n b
= 4
1000 = 250
240 mm
Jarak maksimum s = 2 x h = 2 x 120 = 240 mm
As yang timbul = 4 x ¼ x 3,14 x 10
2
= 314 As ………ok
Jadi digunakan 10
– 240 mm
b. Penulangan Lapangan Arah Y
b = 1000 mm, d = 85 mm
Mu = Mly = 409,292 kg m = 409,292.10
4
N.mm
Mn =
8 .
10 292
, 409
4
x Mu
= 511,615. 10
4
Rn =
2
.d b
Mn
=
2 4
85 1000
10 615
, 511
x x
= 0,708 Nmm
2
m = 294
, 11
25 .
85 ,
240 .
85 ,
c f
fy
perlu
=
fy m
Rn x
m .
. 2
1 1
1
=
240 708
, .
294 ,
11 .
2 1
1 294
, 11
1 x
= 0,003
perlu
min
digunakan
perlu
= 0,003
As = . b . d
= 0,003 . 1000 . 85 = 255 mm
2
Jumlah tulangan n n =
2
. .
4 1
d As
=
2
10 .
14 ,
3 .
4 1
255
= 3,24 4 bh
Jarak tulangan 1 m
2
s = n
b
= 4
1000 = 250
240 mm
Jarak maksimum s = 2 x h = 2 x 120 = 240 mm
As yang timbul = 4 x 14 x 3,14 x 10
2
= 314 As ………ok
Jadi digunakan 10
– 240 mm
c. Penulangan Tumpuan Arah X Tumpuan Tengah
b = 1000 mm, d = 95 mm
Mu = Mtx = 789,350 kg m = 789,350.10
4
N.mm
Mn =
8 .
10 350
, 789
4
x Mu
= 986,687.10
4
Rn =
2
.d b
Mn
=
2 4
95 1000
10 986,687.
x = 1,093 Nmm
2
m = 294
, 11
25 .
85 ,
240 .
85 ,
c f
fy
perlu
=
fy m
Rn x
m .
. 2
1 1
1
=
240 294
, 11
. 093
, 1
. 2
1 1
294 ,
11 1
x
= 0,0046
perlu
min
digunakan
perlu
= 0,0046
As = . b . d
= 0,0046 . 1000 . 95 = 437 mm
2
Jumlah tulangan n n =
2
. .
4 1
d As
=
2
10 .
14 ,
3 .
4 1
437
= 5,56 6 bh
Jarak tulangan s =
n b
= 6
1000 = 166
160 mm
Jarak maksimum s = 2 x h = 2 x 120 = 200 mm
As yang timbul = 6 x ¼ x 3,14 x 10
2
= 471 As ………ok
Jadi digunakan 10
– 160 mm
d. Penulangan Tumpuan Arah Y Tumpuan Tengah
b = 1000 mm, d = 85 mm
Mu = Mty = 877,056 kg m = 877,056.10
4
N.mm
Mn =
8 .
10 056
, 877
4
x Mu
= 1096,32.10
4
Rn =
2
.d b
Mn
=
2 4
85 1000
10 1096,32.
x = 1,517 Nmm
2
m = 294
, 11
25 .
85 ,
240 .
85 ,
c f
fy
perlu
=
fy
m Rn
x m
. .
2 1
1 1
=
240
294 ,
11 .
517 ,
1 .
2 1
1 294
, 11
1 x
= 0,0065
