09-04-2009, 01:55 PM
Hy
u can check there shud not be any multiple structures
go to tools, check multiple structures, coz almost all softwares checks stiffness between elements
try to change the column section coz beam has to transfer the load to columns, beam section must be equal or less
second thing is as follows
There are 2 important checks that should be carried out if instability messages are present.
a) A static equilibrium check. This check will tell us whether all the applied loading flowed through the model into the supports. A satisfactory result would require that the applied loading be in equilibrium with the support reactions.
b) The joint displacement check. This check will tell us whether the displacements in the model are within reasonable limits. If a load passes through a corresponding unstable degree of freedom, the structure will undergo excessive deflections at that degree of freedom.
One may use the PRINT STATICS CHECK option in conjunction with the PERFORM ANALYSIS command to obtain a report of both the results mentioned in the above checks. The STAAD output file will contain a report similar to the following, for every primary load case that has been solved for :
hope it will help u to sortout problem
byee
u can check there shud not be any multiple structures
go to tools, check multiple structures, coz almost all softwares checks stiffness between elements
try to change the column section coz beam has to transfer the load to columns, beam section must be equal or less
second thing is as follows
There are 2 important checks that should be carried out if instability messages are present.
a) A static equilibrium check. This check will tell us whether all the applied loading flowed through the model into the supports. A satisfactory result would require that the applied loading be in equilibrium with the support reactions.
b) The joint displacement check. This check will tell us whether the displacements in the model are within reasonable limits. If a load passes through a corresponding unstable degree of freedom, the structure will undergo excessive deflections at that degree of freedom.
One may use the PRINT STATICS CHECK option in conjunction with the PERFORM ANALYSIS command to obtain a report of both the results mentioned in the above checks. The STAAD output file will contain a report similar to the following, for every primary load case that has been solved for :
hope it will help u to sortout problem
byee