These groups are very helpful when looking at the stress tables in STAAD.Pro post-processing mode. This problem can be easily rectified using the reference point command in STAAD.Pro.įigure 2: Stress distribution diagram Once all the loads have been applied, the engineer may create groups of plates and assign variable steel plate thickness to them. When the in-fill plates command is used, it is very likely that the z-axis for some plates is pointing towards the center and some are pointing away from the center. z-axis) for all plates must be pointing towards the center of the tank or away from the center of the tank. The orientation of the plate local coordinate axis (i.e. In STAAD.Pro, pressure loads on plate elements can be applied with respect to the global and local co-ordinate axis. In order to define the direction of the water pressure loading on the plates, the user must use the plate local coordinate axis as the reference. displacement, acceleration, and velocity graphs will be available to the user for each and every node in the model.įigure 1: Steel Tank geometry in STAAD.Pro Figure 1 also shows the local co-ordinate axis of all the plates in the graphics. ground acceleration) from a past earthquake and STAAD.Pro will be able to calculate the maximum base shears for the support nodes. The seismic time history analysis could be based on ground motion data (i.e.
WATER TANK DESIGN IN STAAD PRO FULL
An engineer has the option of doing a code based seismic analysis or a full seismic time history analysis on tank structures. The modes shapes will be plotted in the STAAD.Pro user interface as illustrated in Figure 3. An engineer may easily find out the various modes and associated frequencies of a steel tank using the MODAL CALCULATION REQUESTED command in STAAD.Pro. STAAD.pro also provides the user with dynamic analysis capabilities. Using a combination of the filter tools and plate grouping options discussed above, one could easily obtain these results and compare them with the allowable stress values. For example, one may only be interested in the results for the combination load cases for plates connected to the foundation. The results in the FEA results tables can be filtered.
The engineer can simply click on a high stress zone in the graphics and STAAD.Pro will pin-point the FEA results for the corresponding plate in the results table. The stress distribution diagrams shown in Figure 2 are displayed with a color legend and the finite element analysis (FEA) results. The deflection diagrams can be exaggerated to verify if there are any connectivity/instability issues in the model. The commands such as perform circular repeat, create in-fill plates were very helpful in generating the geometry.ĭiagrams and deflection diagrams.
The geometry of this tank was drawn using the STAAD interface. Figure 1 shows a steel tank that has been modeled using STAAD.Pro V8i. STAAD.Pro V8i can be used to analyze and design water tanks. Structural Analysis and Design of Tank Structures in STAAD.Pro V8i