I did run the model that provided in Verification Example (Example 10a), but according to the cumulative Energy Curve there is an error. But verification Example 11a is working perfectly. How can I fix that?
There is a PDF file which explains all the necessary information related examples and how the ETABS are working. The PDF is vastly explained how each example works with all the functions and equations. Download the PDF file linked below and you will have the possibility to access these examples.
You will also need a compatible PDF reader application in order to open the file: http://software.informer.com/search/pdf+reader