asistensi _1_ Perencanaan balok anak.pdf
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Transcript of asistensi _1_ Perencanaan balok anak.pdf
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Sumber Lain :
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Lx
Ly
Lx
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A B C D
1
2
3
4
L1 L1 L1
P1
P1
P1
DENAH BANGUNAN
Perencanaan Balok Anak Pada Pelat Atap
Lx = L = 5 m
Ly = P = 6 m
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Pembebanan Balok Anak Pada Pelat Atap
1. Beban Mati Pelat beton tebal 10 cm = 0,1 cm x 2400 kg/m3 = 240 kg/m2 Penggantung langit langit = 7 kg/m2 Plafond eternit (4 mm) = 11 kg/m2 Finishing pada atap (1cm) = 0,01 cm x 2200 kg/m3 = 22 kg/m2 Aspal pada atap (1cm) = 0,01 cm x 1400 kg/m3 = 14 kg/m2 Pasir (1 cm) = 0,01 cm x 1600 kg/m3 = 16 kg/m2 Total = 310 kg/m2
2. Beban Hidup Beban Hidup lantai Atap = 100 kg/m2
Total = 100 kg/m2
3. Kombinasi beban q =U = 1,2 Dl + 1,6 LL = 1,2 x 310 + 1,6 x 100 = 532kg/m2
U = 532 kg/m2
4. Beban merata q ekivalen qek = 3,842 x q = 3,842x 532 kg/m2 = 2043,944 kg/m
Catatan : beban air hujan ≤ 20 kg /cm2 belum dimasukkan
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Suatu balok diatas dua tumpuan sederhana didisain dari profil WF BJ 37
6 m
q = 2043,944 kg/m = 20,44 kg/cm
1. Kontrol lendutan
terhadap beban tetap yang terdiri dari beban mati dan beban hidup.
Lendutan ijin = yizin = L/360 = 600/360 = 1,67 cm ..... Tabel 6.4.1 SNI
Perhitungan Balok Anak Pada Pelat Atap
2. Ix perlu
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3. Mmax dan Vmax Mu = 1/8 x 20,44 kg/cm x (600 cm) 2 = 919800 kg cm Vu = ½ q l = ½ x 20,44 kg/cm x 600 cm = 6132 kg
4. Kontrol Kekuatan Lentur Mu = ø Mn .............. Ø = 0,9 Mn = fy x Z........................(asumsi pelat beton sebagai penahan lateral Lb = 0
dan Penampang Kompak
919800 kg cm ≤ 0,9 x 2400 kg/cm2 x Z Z ≥ 425,833 cm3
Coba WF 350 x 175 x 6 x 9
d = 346 mm b = 174 mm r = 14 cm W = 41,1 kg/m Ix = 11100 cm4 > 10327,0958 cm4 Z = 641 cm3 > 425,833 cm3
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5. Mmax dan Vmax Mu = 919800 kg cm + 1/8 x 0,414 kg/cm x (600 cm) 2 = 938430 kg cm Vu = 6132 kg + 0,4140 kg/cm x 600 cm = 6380 kg
6. Kontrol Lendutan qek’ = qek + berat profil WF = 20,44 kg/cm + 0,414 kg/cm = 20,854 kg/cm
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7. Kontrol Mn dan Vn Mu = 938430 kg cm Vu = 6380 kg ø Mn = 0,9 x fy x Z ø Mn = 0,9 x 2400 kg/cm2 x 641 cm3 = 1384560 kg cm > Mu ..oke ø Vn = 0,9 x 0,6 x fy x Aw (Aw = luas kotor pelat badan) ø Vn = 0,9 x 0,6 x 2400 kg/cm2 x 0,6 cm x 34,6 cm = 26905 kg > Vu ..oke 8. Kontrol Penampang Kompak atau tidak h = 346 – 2 (9+14) = 300 mm
<
<
Kompak
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Vu = 6380 kg
WF 350 x 175 x 6 x 9
WF 350 x 175 x 6 x 9
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6380 kg 1,7
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Vu = 6380 kg Vu = 6380 kg