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Assalamo Alaikum! Building Code of Pakistan 2021 edition has been printed. PDF version of the same is available at the following link. https://drive.google.com/file/d/154K6RIJ0QZJCJ0Q4HsYl-KVqMuJZZF_o/view?fbclid=IwAR3mWSF1X5xBWywdz3-l1kKt7C4HSQi6D4RYZ5RMS0q-eRZ9GGIj8-vJEUk Regards.

After analysis, while starting the design Etabs give this error only while performing concrete frame design. Any one who knows the solution reply to it.. I had this problem during my project. It had been a headache for me for 2 days. This problem arised due to modeling by using beam auto option or column auto option. When ever this problem comes firstly check the modeling. If you have modeled using auto option then replace those beams and columns by any user defined beams. Thanks

Hi, Mr. Umar. Thanks for your reply to clear my doubt. May I know is there any quick way to locate the part causing the eigenvalue instability problem?