30
Kontrol atau Check defleksi
Defleksi jangka panjang total
................................................................... (2.28)
Defleksi total
....................................................................... (2.29)
2.8.2
Perencanaan Berdasarkan Batas Kekuatan Terfaktor (PBKT)
Menentukan Sifat Penampang Komposit
Rasio Modulus (nc)
=
…………………………...(2.30)
Lebar sayap transform (b
e
)
=ncxb
pl
……………………………(2.33)
Luas Penampang Komposit ( A
ck
) = Ac + (b
e
h
slab
)……….....(2.32)
Momen Inersia Penampang Komposit
…
……………………………………………………… (2.33)
.................................................................................... (2.34)
.......................................................................……….(2.35)
....................................................................................(2.36)
...................................................................................(2.37)
Garis berat bawah komposit
.............................. (2.38)
................................................................ (2.39)
Menghitung Momen Kapasitas
...........................................................
(2.40)
..........................................
(2.41)
Nilai ?
p
=
....................................................................... (2.42)
?
p
: 0,55 bila fpy/fpu
= 0,8
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