PERENCANAAN SLOOF MEMANJANG
Perencanaan sloof 300 x 500 ( dari hasil E-TABS) M tumpuan : 25429,41 Nm = 2542,94 kgm M lapangan : 18836,62 Nm = 1883,66 kgm Perhitungan tulangan tumpuan : Mu = 25429,41 Nm = 2542,94 kgm h = 500 mm b = 300 mm f’c = 25 Mpa fy = 240 Mpa selimut beton = 40 mm tulangan pokok = 16 mm tulangan sengkang = 10 mm direncanakan menggunakan tulangan utama = 16 mm d = h – sb – s – ½ tu = 500 – 40 – 10 – 8 = 442 mm Mu 25429410 Mn = Ø = 0,8 = 31786762,5 Nmm Ø . Mn : b .d 2 . fc ' =
0,8.31786762,5 300 . 4422 .25
=
25429410 1465230000
= 0,17
δ = 0,25 ω = 0,022…..dari tabel momen berfaktor
ω = ρ . (fy/fc) 0,022 = ρ . (240 / 25) ρ = 0,0023
ρ min =
1,4 fy
ρ max = 0,75 .
=
[
1,4 240
= 0,0058
0,85 . fc . ß fy
] [ .
600 600+ fy
]
= 0,75 .
[
0,85 .25 .0,85 240
] [ .
600 600+240
]
= 0,04 ρ < ρ min , maka dipakai ρ = 0,0058 As = ρ . b . d = 0,0058 . 300 . 442 = 769,08 mm2 Dipasang tulangan 4 Ø 16 As terpasang = 803,84 mm2 As’ = As Dipasang tulangan 4 Ø 16 As terpasang = 803,84 mm2 Cek lebar perlu : 2 . sb + 2 . Øs + n . Ø TU + (n – 1) Ø TU < b 2 . 40 + 2 .10 + 4 . 16 + 3 . 16 < 300 mm 212 < 300 mm Perhitungan tulangan lapangan : Mu = 18836,62 Nm = 1883,66 kgm h = 500 mm b = 300 mm f’c = 25 Mpa fy = 240 Mpa selimut beton = 40 mm tulangan pokok = 16 mm tulangan sengkang = 10 mm direncanakan menggunakan tulangan utama = 16 mm d = h – sb – s – ½ tu = 500 – 40 – 10 – 8 = 442 mm Mu 18836620 Mn = Ø = 0,8 = 23545775 Nmm Ø . Mn : b .d 2 . fc ' =
0,8.23545775 300 . 4422 .25
=
25429410 1465230000
= 0,128 ω = ρ . (fy/fc) 0,017 = ρ . (240 / 25) ρ = 0,00177
δ = 0,25 ω = 0,017…..dari tabel momen berfaktor
ρ min =
1,4 fy
ρ max = 0,75 . = 0,75 .
=
[ [
1,4 240
= 0,0058
0,85 . fc . ß fy
] [ ] ] [ ]
0,85 .25 .0,85 240
600 600+ fy
.
.
600 600+240
= 0,04 maka dipakai ρ = 0,0058 As = ρ . b . d = 0,0058 . 300 . 442 = 769,08 mm2 Dipasang tulangan 4 Ø 16 As terpasang = 803,84 mm2 As’ = As Dipasang tulangan 4 Ø 16 As terpasang = 803,84 mm2 Cek lebar perlu : 2 . sb + 2 . Øs + n . Ø TU + (n – 1) Ø TU < b 2 . 40 + 2 .10 + 4 . 16 + 3 . 16 < 300 mm 212 < 300 mm
