Looks like there are instability issues in the file. Please check the model carefully to ensure all members are connected properly. Also you can upload the .std file here for investigations.
Dear Abhisek....
this is the std file. please find the mistake and let me know bentley.rar
Hello Arul,
You need to provide some fixity along X directions. If you notice the deflected shape you will find there is no restraint for load along x directions. So, please use some fixed but support with MZ restraint. Please find the modified file.
0028.shed.std
thank u so much Abhisek....