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Jumat, 01 Maret 2013

CONTOH PERHITUNGAN PENULANGAN TANGGA

Contoh hasil analisa dari ETABS didapat :

Pada pelat tangga :

M11 = -311,6979 Kgm = -3116979 Nmm

M22 = -1582,6438 Kgm = -15826438 Nmm

Pada bordes :

M11 = -879,6493 Kgm = -8796493 Nmm

M22 = 1863,7989 Kgm = 18637989 Nmm

Tebal pelat t = 15 cm = 150 mm

PADA PELAT TANGGAARAH 1-1

d = 150 -25 = 125 mm

As = 86,58 mm2

As min = 0,0020 x b x d = 0,0020 x 1000 x 125 = 250 mm2

250 mm2 > 86,58 mm2

Maka As perlu = 250 mm2

Pakai tulangan diameter 8 mm

A = x x d2 = x x 82 = 50,265 mm2

A = 50,265 x 5 = 253,125 mm2

Jarak tulangan 1000/5 = 200 mm maka 8-200 mm

a = 4,765

Mn = x As x fy x (d-a/2) = 0,8 x 253,125 x 400 x (125-(4,765/2))

= 9932017,5 Nmm

Mn > Mu

9932017,5 Nmm > 3116979 Nmm ..(OK)

Maka dipakai tulangan pembagi 8-200 (arah pendek)

ARAH 2-2

d = 150 -25 = 125 mm

As = 439,62 mm2

As min = 0,0020 x b x d = 0,0020 x 2500 x 125 =

625 mm2 625 mm2 > 439,62 mm2

Maka As perlu = 625 mm2

Pakai tulangan diameter 8 mm

A = x x d2 = x x 82 = 50,265 mm2

A = 50,265 x 13 = 653,445 mm2

Jarak tulangan 2500/13 = 192 mm maka 8-192 mm

a = 4,920

Mn = x As x fy x (d-a/2) = 0,8 x 653,445x 400 x (125-(4,920/2))

= 25623408,1 Nmm

Mn > Mu

25623408,1 Nmm > 15826438 Nmm ..(OK)

Maka dipakai tulangan pembagi 8-192 (arah panjang)

PADA PELAT BORDESARAH 1-1

d = 150 -25 = 125 mm

As = 244,347 mm2

As min = 0,0020 x b x d = 0,0020 x 1000 x 125 = 250 mm2 250 mm2 > 244,347 mm2

Maka As perlu = 250 mm2

Pakai tulangan diameter 8 mm

A = x x d2 = x x 82 = 50,265 mm2

A = 50,265 x 5 = 253,125 mm2

Jarak tulangan 1000/5 = 200 mm maka 8-200 mm

a = 4,765

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Mn = x As x fy x (d-a/2) = 0,8 x 253,125x 400 x (125-(4,765/2))

= 9932017,5 Nmm

Mn > Mu

9932017,5 1 Nmm > 8796493 Nmm ..(OK)

Maka dipakai tulangan pembagi 8-200 (arah pendek)

ARAH 2-2

d = 150 -25 = 125 mm

As = 517,722 mm2

As min = 0,0020 x b x d = 0,0020 x 1000 x 125 = 250 mm2

517,722 mm2 > 250 mm2

Maka As perlu = 517,722 mm2

Pakai tulangan diameter 8 mm

A = x x d2 = x x 82 = 50,265 mm2

A = 50,265 x 11 = 552,915 mm2

Jarak tulangan 1000/11 = 90,909 mm 90 mm maka 8-90 mm

a = 10,408

Mn = x As x fy x (d-a/2) = 0,8 x 552,915x 400 x (125-(10,408/2))

= 21195841,71 Nmm

Mn > Mu 21195841,71 Nmm > 18637989 Nmm

Maka dipakai tulangan pembagi 8-90 (arah panjang)

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