I am wondering about the warning that I got on my output file saying that "ZERO STIFFNESS IN DIRECTION 1 4 5 6" and that is the intersection node of cross bracing. I specified the bracing members as truss elements within STAAD library although example one in tutorial found in STAAD manual and had the same warning, but still I am concern for that, since they are stating that all the load in that directions will be ignored.