Laserfiche WebLink
Structural <br />Engineering & Design Inc. <br />Bob S <br />Airborne <br />CITY OF SANTA ANA <br />Planning and Building Agency <br />Approved <br />FOR PERMIT ISSUANCE <br />Ma lb":25-0221-14 <br />BEAM Contiguration: Type A Selective Rack I uaie: <br />A) Check compression flange for local bucklina (B2.1 <br />w= c - 2*t -2*r <br />= 1.75 in - 2*0.057 in - 2*0.057 in <br />= 1.522 in <br />w/t= 26.7 <br />1=lambda= [1.052/(k)^0.5] * (w/t) * (Fy/E)^0.5 <br />= [1.052/(4)^0.5] * 26.7 * (55/29500)^0.5 <br />= 0.606 < 0.673, Flange is fully effective <br />B) check web for local buckling per section b2 3 <br />fi(comp)= Fy*(y3/y2)= 50.53 ksi <br />f2(tension)= Fy*(y1/y2)= 102.29 ksi <br />Y= f2/f1 Eq. B2.3-5 <br />= -2.024 <br />k= 4 + 2*(1-Y)-3 + 2*(1-Y) Eq. B2.3-4 <br />= 65.35 <br />flat depth=w= y1+y3 <br />= 3.897 in w/t= 68.36842105 <br />1=lambda= [1.052/(k)^0.51 * (w/t) * (f1/E)^0.5 <br />= [1.052/(65.35)^0.5] * 3.897 * (50.53/29500)^0.5 <br />= 0.368 < 0.673 <br />be=w= 3.897 in b2= be/2 <br />b1= be(3-Y) = 1.95 in <br />= 0.776 <br />b1+b2= 2.726 in > 1.2885 in, Web is fully effective <br />Determine effect of cold working on steel yield point (Fya) per section A7 2 <br />Fya= C*Fyc + (1-C)*Fy (EQ A7.2-1) <br />Lcorner=Lc= (p/2) * (r + t/2) <br />0.134 in C= 2*Lc/(Lf+2*Lc) <br />Lflange-top=Lf= 1.522 in = 0.150 in <br />m= 0.192*(Fu/Fy) - 0.068 (EQ A7.2-4) <br />= 0.1590 <br />Bc= 3.69*(Fu/Fy) - 0.819*(Fu/Fy)^2 - 1.79 <br />= 1.427 <br />since fu/Fv= 1.18 < 1.2 <br />and r/t= 1 < 7 OK <br />then Fyc= Bc * Fy/(R/t)^m (EQ A7.2-2) <br />= 78.485 ksi <br />Thus, Fya-top= 58.52 ksi (tension stress at top) <br />Fya-bottom= Fya*Ycg/(depth -Ycg) <br />= 113.59 ksi (tension stress at bottom) <br />Check allowable tension stress for bottom flange <br />Lflange-bot=Lfb= Lbottom - 2*r*-2*t <br />= 2.522 in <br />Cbottom=Cb= 2*Lc/(Lfb+2*Lc) <br />= 0.096 <br />Fy-bottom=Fyb= Cb*Fyc + (I-Cb)*Fyf <br />= 57.2V ksi <br />Fya= (Fya-top)*(Fyb/Fya-bottom) <br />= 29.50 ksi <br />75 in v <br />Eq. B2.1-4 <br />4.125 in <br />Eq. B2.1-1 <br />Beam= HMH 41160/4_]: <br />X3 <br />Eq B2.3-2 <br />(EQ A7.2-3) <br />if F= 0.95 Then F*Mn=F*Fya*Sx= 20.73 in-k <br />depth <br />1.625 in <br />0.057 in <br />Ix= 1.617 in <br />Sx= 0.740 in <br />Ycg 2.723 in <br />t= 0.057 in <br />Bend Radius=r= 0.057 in <br />Fy=Fyv= 55.00 k: <br />Fu=Fuv= 65.00 ks <br />E= 29500 k! <br />top Flange=b= 1.750 in <br />bottom flange= 2.750 in <br />Web depth= 4.' '1z t^ <br />Fy <br />Me mo) <br />y1= Ycg-t-r= 2.609 in <br />y2= depth-Ycg= 1.403 In <br />y3= y2-t-r= 1.289 in <br />