Dear Richard,

Thanks for your mail.

Problem 5 has Av=0. I have been unable to get this condition anywhere in TANK as TANK makes some internal calculations and assigns a non zero value to Av. Kindly elucidate how this can be brought about as this has great impact on stsability and stresses.


Pl find herebelow output of Problem 6. I have tweaked the input to get the relevent parameters in line with the example values.D=100ft, H=40ft, G=0.7. Only Ai is slightly off. The Code result is around 15000psi while in this output the result exceeds 38000psi, hence declared "unsafe" while not so. My hand calculations agree with Code results. These are in a state of dribble and shall be mailed to your tech support after tidying.



TANK, API-650/653 Analysis COADE, Inc. @1994-2008 Page
Licensed To: MOTT MACDONALD CONSULTANTS PVT LTD I
Job: APItrlAY Date: 03/03/11 Time: 11:45:17
SEISMIC EVALUATION RESULTS - Appendix E
API-650 11th Edition, June 2007

Site-Specific Ground Motion
Design Fluid Weight (lb.) 0.13715E+08
Sp -design level peak accel for nonASCE 0.00000
Ss -MCE at period of 0.2 seconds 1.0300
S0 -MCE at period of 0.0 seconds 0.28000
S1 -MCD at period of 1.0 seconds 0.42000
SDS-design spectral accel parameter 0.89000
FA -acceleration based site coefficient 1.0880
FV -velocity based site coefficient 1.5800
TS - FvS1 / FaSs 0.59216
TC -convective sloshing period (sec) 6.0928
Ac -convective spectral accel parameter 0.54015E-01
Ai -impulsive spectral accel parameter 0.25429
Wc -effective convective fluid weight(lb. ) 0.70914E+07
Wi -effective impulsive fluid weight (lb. ) 0.61704E+07
Vc -convective liquid base shear (lb. ) 0.38304E+06
Vi -impulsive liquid base shear (lb. ) 0.16533E+07
V -total design base shear (lb. ) 0.16971E+07
VS -shear resistance (lb. ) 0.53387E+07
Xc -ring wall convective moment arm (ft. ) 22.956
Xi -ring wall impulsive moment arm (ft. ) 15.000
XCS-slab convective moment arm (ft. ) 35.380
XIS-slab impulsive moment arm (ft. ) 39.449
WS -shell+appurtenances weight (lb. ) 0.24383E+06
Wrs-roof, framing 10% snow weight (lb. ) 0.00000
Mrw-ringwall overturning moment (ft.lb. ) 0.26170E+08
Ms -slab overturning moment (ft.lb. ) 0.64451E+08
AV -vertical acceleration parameter 0.12460
Ge -effective specific gravity 0.66511
wa -resisting annulus force (lb./in.) 147.04
wt -tank + roof weight at shell base (lb./in.) 64.678
J -the anchorage ratio 1.0460
L -reqd min annular plate projection (ft. ) 0.00000
Wab-Minimum anchorage resistance (lb./in.) 0.00000
N -number of anchor bolts required 0



TANK, API-650/653 Analysis COADE, Inc. @1994-2008 Page
Licensed To: MOTT MACDONALD CONSULTANTS PVT LTD I
Job: APItrlAY Date: 03/03/11 Time: 11:45:17
Pab-anchor seismic design load (lb. ) 0.00000
Sc -shell compressive stress (lb./sq.in.) 866.12
Sa -shell allowable stress (lb./sq.in.) 4506.7
Height of sloshing wave (ft. ) 2.4419
Required Freeboard (ft. ) 1.7093
Course Hoop Stress Hoop Allowable
(lb./sq.in.) (lb./sq.in.)
1 38370. 26600.
2 27450. 26600.
3 19294. 26600.
4 30193. 26600.
5 18420. 26600.
6 8467.9 26600.
7 9942.9 26600.
Seismic Evaluation Summary.
Seismic shell stress check passed.
Base shear within limits.
Hoop stress exceeds allowable.



Regards,