I have been designing an RHS with a base plate and gusset stiffeners. I've used master-slave command for the location of my loads and used Plate Mat Support as supports. The error was always "ERROR IN SUPPORT INPUT OR THERE IS NO SUPPORT INPUT. ANALYSIS WILL NOT BE PERFORMED. DATA-CHECK MODE ENTERED." even though the support command is clearly present in STAAD Command Editor, and acccordingly arranged with SLAVE command. What must be the error and solution for this?Alternatively, I used plain pin supports located at every node of the plate of my model base plate. No error was found with this said model. How reliable is this compared to using Plate Mat Support? Thank you in advance!Note: I'll post my model files after the shift. Local network has been locked for now.
From the description it seems there is some issue in the plate mat support specification in the model. We will wait for the model to check and provide a solution.
Base Plate with Stiffener FEM 07 (Success, Pin Support-Double Stiffener).STDBase Plate with Stiffener FEM 07 (Plate Support).STDGood day! I have uploaded two models, same specification and stuff, but only differ in the assigned support. One has nodal pin support while the other has the Plate Support command, which always leads to an error, mentioned in the first post. Any review or suggestion would be appreciated! Thank you!
Thanks for sharing the file. Here I think the value of subgrade modulus is creating the problem. You have used 200 kN/m2/m value which is kind of soft support and hence may be the displacement is so high the program is unable to find a solution. I would request you to review that part and use a higher value if possible. When as a trial I use 500 instead of 200 the file run without any error. One more point is that you have defined compression only springs which is causing some more issues in the model. If you change it to none most of the warnings will be solved.
Answer Verified By: Lake Osnaznara
I see. So that's where the problem is coming from. Thank you for such answer! I would like to add a follow up question. What if the base plates are attached to a Steel I-beam, is the plate mat support still applicable? If not, what support specification is recommended for such case? I am self-studying for this case.Thank you for your prompt response! Well appreciated!
Hello,
This is a very hard question to answer as there is no specific rule for that. You can use this method as well but the question here will be the value of modulus subgrade. Instead of that you can use some spring support too but gain the value of spring constant you need to find out.
A method could be using P/X as spring constant where, P is the maximum allowable load and Z is the allowable deflection of that supporting beam. But this will be subjected to some kind of R&D and you may study some paper if available to get better modelling methods.
Thank you for your insights! Your reply is verry much helpful!