Dear all,

I was once told that +Y restraints are forbidden by B31.3 code and that I should use "Y" supports instead. Please explain to me the reason behind this, and the advantages and/or disadvantages of "Y" over "+Y" restraint.
I would also like to know if there are special cases where +Y restraints are allowed (e.g. can an existing +Y support be modelled as a "+Y" restraint in Caesar II).

Thanks