Dear Engineers,
Im designing Square Steel water tank using STAAD. I have few doubt. pls. clarify if u have could... Thanks in advance.
1) say the size is 3m x 3m x 2m
Hence volume = 18m3
Weight of water =18*1000 = 18000kg
Pressure on bottom of the tank will be 2000kg/m2
How to calculate the pressure on side wall of the tank
2) When there are so many stress result is shown in post-processing . Which stress do we need to consider for design. Is max Absolute ok?
Lateral pressure can be calculated by multiplying the Gamma ( density ) by the depth. You can use the Hydrostatic plate load option in STAAD.Pro and it would apply the pressure appropriately on the walls.
Regarding your question on which stress to look at, it depends on what you are trying to do. Reinforcements can be designed based on the MX and MY moments. If you are looking for axial stress in the walls you will be looking at SX or SY. If you are looking for out of plane shear stresses you can check the SQX, SQY. Max Von Mises stress is a good measure of total stress as it combines axial, bending and in plane shear.