|
|
||
|
|
|
|
The loading is seismic horizontal base excitation
FROM:
Mahmoud R. Maheri and A. Abdollahi (Department of Civil Engineering, Shiraz University, Iran),
“Corrosion effects on the buckling of steel tanks under seismic loading”, 15 WCEE, Lisbon, 2012
SUMMARY: A numerical program is carried out to investigate the effects of internal shell corrosion on the dynamic buckling of three cone roof ground-based, steel cylindrical tanks having different height/diameter ratios subjected to horizontal seismic base excitations. Detailed numerical models of the tank-liquid systems at different stages of corrosion degradation are subjected to two representing accelerograms, and for each model the critical peak ground acceleration (PGA) for dynamic buckling of the shell and its associated mode of failure are evaluated. It is found that in all three tanks, the critical PGA is markedly reduced with thinning of the shell, irrespective of the type of ground input. The effects of corrosion degradation on the critical buckling load of the tanks was found to be such that after 20 years of thinning due to corrosion, the static loading alone was responsible for the elephant foot buckling of the shell.
Page 415 / 444