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Here is the update on above problem, for the benefit of others that might be interested in knowing how to go about this type of error. The solution of above 'Data Saving Error 0' was obtained luckily soon, using following procedure. By intuition, I imported the problematic model in ETABS 2016 to see what happens. Surprisingly, the import indicated just one warning message about ignoring of a certain data line in the input file being imported. The analysis however followed & completed successfully by Etabs 2016. From here, I got an idea about what might be the real problem area that ETABS v9 was unable to handle. So, I opened the problematic ETABS v9 text input file (.$ET) in notepad, searched for the data line ignored by ETABS 2016 while analysing, and deleted the whole block. Resaved the file with new name & imported it now into ETABS v9. This trick really worked, and model was analyzed properly this time by ETABS v9. By the way, the data line which was causing problem, was related to Structural Steel specifications, and actually no structural steel elements were present in the said software model. Regards

AA. Following documents provide basic technical knowledge regarding design of tunnels. These include design examples as well:- 1. Guidelines for the Design of Tunnels a. Design Example-1 b. Design Example-2 2. Technical Manual for Design and Construction of Road Tunnels 3. Tunnel lining design guide - RG For more resources, you may use following link:- Tunnel Design weblinks HTH Regards.