The elevated tank pictured here is the largest prestressed concrete tank in the United States. Design elements include a mat foundation, pedestal, transition from pedestal to inner floor cone to outer cone, inner floor cone, outer cone wall, top cylindrical wall and free span dome.
Due to the complicated interfaces between the various elements, finite-element analysis was used as the principal analysis tool. However, initial member sizes were estimated using classical analysis methods. Also, where applicable, classical method calculations were used to verify finite-element results.
STAAD.Pro was used for the finite element analysis, both static and dynamic. The results provided by STAAD.Pro correlated closely to classical analysis in those areas of the structure where such analysis could be used. In addition, the finite element analysis by STAAD.Pro provided the results required to design the interfaces between each of the classical shell elements. STAAD.Pro was also invaluable in analysing and designing the circumferential and meridional prestressing strands by an iterative process.
STAAD.Pro dynamic response spectrum analysis was also used in designing the elevated structure for seismic loadings.
For more information contact Bentley Systems SA, 011 462 5811.