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Generally these can happen due to modeling issues. Some of the common modeling problems arise from improper connectivity between members/elements or from application of releases/truss specifications which in turn leads to zero stiffness/instabilities.
To view documents related to connectivity issues between elements and how to fix these, please click here. To find out more on Zero stiffness and Instabilities in the model please click here.
Here are the steps to scale the model
Close the STAAD model and create a new model.
Go to Geometry > Run Structure Wizard to bring up the Structure Wizard program. Change the model type to Import CAD Models.
Double click on the STAAD.Pro logo and browse to the original STAAD file that you want to scale.
Click on Open.
Once the model comes in, go to the top menu inside StWizard and choose Edit > Scale.
In the box provide appropriate factors for XScale, YScale and ZScale and click on Ok.
Go to File menu inside StWizard and choose Merge Model With STAAD.Pro model.
Choose the appropriate X, Y and Z location where to place the model inside the new STAAD.Pro file
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Couple of comments:
Q. How do I stop the Auto Save screen from appearing over and over again in Staad.Pro?
Proposed "solution" is not an answer to the question. The users want to know how to stop the Auto Save screen popping-up endlessly, not how to turn off auto safe feature.
Q. How do I merge 2 staad models?
First of all - suggested technique does not work - error message "Multiple entities cannot be copied on the clipboard" appears after Edit/Copy. Second - the question is quite clear - "How do I merge 2 staad models", not "How do I merge geometry". Model is much more that just geometry and includes specifications, loads, load combinations, units, groups, etc.