Staad modeling plates

[morfeuss]

Hello to everyone, im new here, and ew with staad.
im actually making a model in staad for a prefabicated building, i would like to know how do i do to make it such that the vertical plates whoch lies on the horizontal plate transfers only fertical forces and no moment.

or is it such in staad if i make a vertical plate just on a horizontal plate, it is not considered as connected? as when i run an analysis, no fores are transfered at all to the horizontal, as i applied forces only on vertical plate//// see attachment for the model if anyone could help i would appreciate.

thnaks

 

[morfeuss]

sorry for the double post, but i guess this attachment is the one, well i hope

 

[structuresguy]

OK, I see your problem right away. I have a saying (actually not mine, it came from a friend) that applies here:

No Node = No Load

Whenever you want to connect a plate to anything (other plates, beams, columns, supports, etc), there needs to be a common node defined in both items, or they are not connected at all. Loads will only transfer (in staad) at a node. Staad is VERY strick here, and your results will be garbage if you are not extremely careful in how you mesh everything.

In your case, you have one flat horizontal plate across the entire structure. THis is only connected at the four corners of the plate. No where else. You will need to mesh this down so that you have nodes at each location where you want to transfer forces.

Same thing applies along the joint between your vertical plates running in the X and Z directions. They do not appear to be connected, as there are multiple nodes at what should be the connection point. You will need to remesh these so that you have one common node only at each point of connection.

Etabs is more forgiving here than Staad, though my saying above still applies. But Etabs will automesh along commong lines where plates intersect each other, using a function called "auto line constaints".

 

[morfeuss]

Thanks for the tip, it was very helpfull... i already switched to feat 200 for my modelling already, it makes automatic connections and its more or less simpl and i can get deflection isolines.