Posted by: judge
WIND OVERTURNING STABILITY CHECK - 06/27/12 07:28 AM
Dears,
for 41m diameter, 8m height, design liquid level 7m, annular plate thickness 10mm and CA 2mm
As I understand
1- From API650 (5.11.2)The liquid weight (wL)shall be the lesser of 14.8HD for SI Units and wL = 59tb sqrt(FbyH)
by calculations 14.8*41*7= 4247.6
and 59*8*aqrt(250*7)= 19745 N/m
from software report
wa = 154.92 N/cm = 15492 N/m
why is this big difference between 14.8HD (4247.6)(lesser)and 15492 by the software ?
2- overturning moment from horizontal wind pressure= 0.86(160/190)^2*d*h*h/2= 803 kN.m
overturning moment from vertical wind pressure=
1.44(160/190)^2*roof area(1320)*d/2 = 27736 kN.m
from software report
Mw - moment due to wind (hor+ver) press = 779.1 kN.m
can anyone help me what's wrong in my calculations
thank you
for 41m diameter, 8m height, design liquid level 7m, annular plate thickness 10mm and CA 2mm
As I understand
1- From API650 (5.11.2)The liquid weight (wL)shall be the lesser of 14.8HD for SI Units and wL = 59tb sqrt(FbyH)
by calculations 14.8*41*7= 4247.6
and 59*8*aqrt(250*7)= 19745 N/m
from software report
wa = 154.92 N/cm = 15492 N/m
why is this big difference between 14.8HD (4247.6)(lesser)and 15492 by the software ?
2- overturning moment from horizontal wind pressure= 0.86(160/190)^2*d*h*h/2= 803 kN.m
overturning moment from vertical wind pressure=
1.44(160/190)^2*roof area(1320)*d/2 = 27736 kN.m
from software report
Mw - moment due to wind (hor+ver) press = 779.1 kN.m
can anyone help me what's wrong in my calculations
thank you