I am designing a truss structure and its showing Some Notes and Warnings in results output like:
Notes-
1)Very weak Spring Added for stability
Warnings-
1)Instability at joint
2) Zero stiffness in direction 3 at joint .
Kindly check the attached file and give some solution.
Regards,
Akshay Rana
full truss.std
I think you should change the model type from STAAD TRUSS to STAAD SPACE. Then assign the truss specifications to the web members only, but do not assign it to top and bottom chords as usually these elements are taking some moment.
Answer Verified By: Akshay Rana
Please replace the "STAAD TRUSS" command in editor file with "STAAD SPACE".
If you use "STAAD TRUSS" command then all members are subjected to axial force only. There will be no bending moment in the members. But in your structure bending is happening. So you are getting those warnings. If you want some of the members to take axial force only then you may assign truss or release from specification tab.