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2 things should be checked:
1) Go to the View -> Options menu and select line Tolerance in the opened window. Make sure that the Tolerance value is entered as 0.01 inches (or 0.001 meters). If this value is much higher or entered as 0, change it to 0.01.
2) Open the Structure Wizard and go to File -> Select Units. Make sure that selected units are the same as in the main STAAD.Pro model.
*Note: in order to change the Tolerance value, make sure that you have full read/write privileges to the file StaadPro20070.ini which is located in (for STAAD.Pro SELECTseries 4):
Windows XP OS: C:\Documents and Settings\All Users\Application Data\Bentley\Engineering\STAAD.Pro V8i SS4\
Windows 7/8 OS: C:\ProgramData\Bentley\Engineering\STAAD.Pro V8i SS4\
This file can be located in different folder for older STAAD.Pro versions.
When one defines a plate, the actual thickness of the diaphragm is modeled through plate thickness definition. So the true stiffness of the slab is considered in the analysis and diaphragm shears are distributed accordingly. If the thickness is small, the diaphragm would behave more like a flexible diaphragm and similarly as thickness is increased, the slab would tend to behave like a rigid diaphragm.
The software does not idealize the diaphragm as rigid or flexible. However you can always compare the maximum lateral deflection of the diaphragm to the average lateral drift of the adjacent vertical elements and thereby classify it, if you need to.
You need to go to the top menu and choose View > Structural Tool Tip options and you will find a number of check boxes using which you can turn on the items that you want to be displayed.
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.