Pondasi Evi
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Tugas Pondasi | EVI KRISTIANINGRUM
Diketahui
P= 55 ton
Pu= 1,4 x 55
= 77 ton
B= 1,75 m
L= 1,75 m
th= 0,5 m
X= -0,68 m
Y= 0,44 m
Mx= P x y
=55 x (0,44)
= 24,2 ton m
My= P x x
= 55 x -0,68
= -37,4 ton m
Menghitung d
Mx P( - ) = 0
24,2 55 ( QUOTE 2 - )= 0
24,2 48,125 - = 0
= 23,925
dx= 1,305 m
My P ( - ) = 0
-37,4 55 ( QUOTE 2 - )= 0
-37,4 48,125 - = 0
= 85,525
dy= 4,665 m Menghitung tegangan yang terjadi
Kedalaman pondasi telapak 1m
qc = 400 kg/cm2qa =
=
= 10 kg/cm2q= x dx x B
55= x 1,305 x 1,75
qx= 48,166 ton/m2q= x dy x B
55= x 4,665 x 1,75
qy= 13,474 ton/m2 Pengecekan Terhadap Geser PonsDiketahui :
fc
= 25 Mpa = 250 kg/cm2 = 0,75B= 1,75 m
bkolom= 0,3 m = 30 cm
L= 1,75 m
Lkolom= 0,3 m =30 cm
Dtulangan = 16 mm = 1,6 cm
Cv= 5 cm
th= 0,5 m = 5 cm
d
= th cv (0,5 x )
= 50 5 (0,5 x 0,75)
= 44,2 cm
Apondasi= B x L
= 1,75 x 1,75
= 30625 cm2Akolom= 56,6 x 74,2
= 4199,72 cm2Apons= Apondasi - Akolom
= 30625 4199,72
= 26425,28 cm2 bo (keliling kritis pons)
bo= 2 x [(bkolom + d)+( bkolom + d)]
= 2 x ( 74,2 + 56,6)
= 261,6 cm
Vc= x bo x d
= x 261,6 x 44,2
= 105552,7 kg/cm Vc= 0,75 x 105552,7
= 79164,532 kg/cm u=
=
= 2,514 kg/cm2 Vu ponds= u x Apons
= 2,514 x 26425,28
= 66440,7 kg/cm
Vu Vc maka tebal pondasi cukup Pengecekan Terhadap Geser LenturAlentur= 175 x 93, 96
= 16443 cm2Vu= u x Alentur
= 2,514 x 16443
= 41342,4 kg/cm2Vc= x B x d x 10
= x 175 x 44,2 x = 20791,19 kg/cm Vc= x Vc= 0,75 x 20791,19
= 49310.625 kg/cmVu Vc maka tebal pelat pondasi dapat menahan geser lentur. Perhitungan Penulangan Menghitung momen arah x
Mux= Pu x (1 x 1,165)
= 77000 x (1 x 1,165)
= 89705 kgm
= 8970500 kgcm
Menghitung momen arah y
Muy= Pu x (1 x 1,405)
= 77000 x ( 1 x 1,405)
= 108185 kgm
= 10818500 kgcm
Menghitung tulangan arah x Mencari nilai 1Jika fc 300 kg/cm2 maka 1 = 0,85Nilai fc = 250 kg/cm2 (fc 300 kg/cm2 maka 1 = 0,85) Mn=
=
= 13523125 kgcm
K=
=
= 0.1861 F= 1-
= 1- = 0.2077 Fmax= = = 0.3864
F Fmax maka Tulangan Tunggal As= = = 87.54108 cm2 min = 0,0025 (nilai min untuk plat)Asmin= min x B x d
= 0,0025 x 175 x 44,2
= 19.3375 cm2Digunakan As > Asmin dipasang diameter tulangan D16 dengan jumlah tulanganA22=
=
= 3.7994 cm2 Jumlah tulangan = = = 23,04 23 D 22 Untuk Tulangan Atas (As) = 0,15 % x B x d
= 0,15 % x 175 x 44,2
= 11,6025 (23 D 16)