Mulai

𝐻/𝑡𝑤>2550/𝑓𝑦 Hitung Balok Biasa

menghitungSx,Iy,A,rT=√(𝐼𝑦/𝐴)

Menghitung Mn𝞴𝐺=𝐿/𝑟𝑇𝞴𝑝=1,76.√(𝐸/𝑓𝑦)

ke = 4/√(ℎ/𝑡𝑤)𝞴𝑟=1,35.√((𝑘𝑒. )/ )𝐸 𝑓𝑦

B

Hitung Vn

𝞴𝑔<𝞴𝑝fcr= fy

𝞴𝑝<𝞴𝑔<𝞴𝑟 𝞴𝑟<𝞴𝑔

Cb =(12,5 𝑀𝑚𝑎𝑥)/(2,5 𝑀𝑚𝑎𝑥+3𝑀𝐴+4𝑀𝑏+3𝑀𝑐) <2,3

Fcr = Cb.Fy.(1-(𝞴𝑔−𝞴𝑝)/(2(𝞴𝑟−𝞴𝑝)) < fy

ditentukan torsi lateralFc = (𝐶𝑏.𝑓𝑦)/2<𝑓𝑦ditentukan olehtekuk lokal

Fc = 𝐹 /2𝑦

1

1

𝞴𝑔<𝞴𝑝

𝞴𝑔 = 𝑏𝑓/2𝑡𝑓𝞴𝑔=0,38.√(𝐸/𝑓𝑦)

fcr=fyar=𝐴𝑤/𝐴𝑓Kg=1-(𝑎𝑟/(1200+300.𝑎𝑟))(ℎ/𝑡𝑤 − 2500/√𝑓𝑐𝑟)<1

Mn = Kg.S.fcrϕMn=0,9.Mn

Hitung Vn

B