278 Vs =
s d
fy Av
× ×
= 150
5 ,
659 400
13 4
1
2
× ×
× ×
π = 233431,853 N
= 23,343185 T V
U
= Vc + Vs = 24,73125 + 23,343185
= 47,074435 T
d. Gelagar melintang diatas abutment
¾ Pada daerah tumpuan
b = 16 hf + bw
¼ L =
450 300
16 +
× ¼ 3400
= 5250 mm 850 mm
b = 850 mm
= 0,85 m A As fy
= 400
2946 4419
× +
= 2946000 B
hf b
RI ×
× =
300 850
25 85
, ×
× ×
= 5418750 A B, sehingga dihitung seperti penampang persegi
h = 0,75
m b =
0,45 m
Gambar 5.33 Penampang gelagar melintang diatas abutment di daerah tumpuan
d = h – t.selimut – Ø sengkang – ½ Ø tul. Utama
= 750 – 40 - 13 – ½ .25 =
684,5 mm
279 d’
= h – d + jarak min antar baris tulangan = 750 – 684,5 + 25
= 90,5
mm
Kapasitas Momen Penampang
As =
2
25 4
1 6
× ×
× π
= 2946 mm
2
As’ =
2
25 4
1 9
× ×
× π
= 4419 mm
2
f’c = 25 Mpa
fy = 400 Mpa
ρ = d
x b
As
= 5
, 684
450 2946
x =
0,01 ρ =
d x
b As
= 5
, 684
450 4419
x =
0,015 ρ min =
fy 4
, 1
= 400
4 ,
1 =
0,0035 ρ min ρ ........berarti penampang mencukupi
F = c
f x
fy x
85 ,
ρ
= 25
85 ,
400 01
, x
x =
0,188235
280 K =
⎟ ⎠
⎞ ⎜
⎝ ⎛ −
2 1
F x
F =
⎟ ⎠
⎞ ⎜
⎝ ⎛ −
2 188235
, 1
188235 ,
x =
0,170519 M
U
= c
f x
x d
x b
x K
85 ,
2
= 25
85 ,
5 ,
684 450
170519 ,
2
x x
x x
= 763996079,9 Nmm = 76,399608 Tm
Kapasitas Geser Penampang
Vc = d
b ×
× ×
25 6
1 =
5 ,
684 450
25 6
1 ×
× ×
= 256687,5 N =
25,66875 T
Vs = s
d fy
Av ×
× =
150 5
, 684
400 13
4 1
2
× ×
× ×
π = 242280,673 N
= 24,228067 T V
U
= Vc + Vs = 25,66875 + 24,228067
= 49,896817 T
281
¾ Pada daerah lapangan
h = 0,75
m b =
0,45 m
Gambar 5.34 Penampang gelagar melintang diatas abutment di daerah lapangan
d = h – t.selimut – Ø sengkang – ½ Ø tul. Utama – jarak min tulangan
= 750 – 40 - 13 – ½ .25 - 25 =
659,5 mm
d’ = h – d - jarak min antar baris tulangan
= 750 – 659,5 - 25 =
65,5 mm
Kapasitas Momen Penampang
As =
2
25 4
1 9
× ×
× π
= 4419 mm
2
As’ =
2
25 4
1 6
× ×
× π
= 2946 mm
2
f’c = 25 Mpa
fy = 400 Mpa
ρ = d
x b
As
= 5
, 659
450 4419
x =
0,015
282 ρ =
d x
b As
= 5
, 659
450 2946
x =
0,01 ρ min =
fy 4
, 1
= 400
4 ,
1 =
0,0035 ρ min ρ ........berarti penampang mencukupi
F = c
f x
fy x
85 ,
ρ
= 25
85 ,
400 015
, x
x =
0,282535 K =
⎟ ⎠
⎞ ⎜
⎝ ⎛ −
2 1
F x
F =
⎟ ⎠
⎞ ⎜
⎝ ⎛ −
2 282535
, 1
282535 ,
x =
0,242491 M
U
= c
f x
x d
x b
x K
85 ,
2
= 25
85 ,
5 ,
659 450
242491 ,
2
x x
x x
= 1008548232 Nmm = 100,8548232 Tm
Kapasitas Geser Penampang
Vc = d
b ×
× ×
25 6
1 =
5 ,
659 450
25 6
1 ×
× ×
= 247312,5 N = 24,73125 T
283 Vs =
s d
fy Av
× ×
= 150
5 ,
659 400
13 4
1
2
× ×
× ×
π = 233431,853 N
= 23,343185 T V
U
= Vc + Vs = 24,73125 + 23,343185
= 47,074435 T
e. Gelagar melintang anak
