I am learner in Staad and in modeling a steel platform i am getting similar errors
***WARNING - INSTABILITY AT JOINT 98 DIRECTION = MX
*WARNING- ZERO STIFFNESS IN DIRECTION 4 AT JOINT 11 EQN.NO. 1060
**WARNING: IF THIS UBC/IBC ANALYSIS HAS TENSION/COMPRESSION
***WARNING - INSTABILITY AT JOINT 97 DIRECTION = MX
How could i resolve this. need guidelines.