It is connected in node 513.
DO not look at model with offssets displayed in such case.
"Note: Bars that have offsets defined are connected with other structure elements or the ground (supports) in the nodes defining these bars, and not in the nodes displaced by an offset value. For columns displaced horizontally with respect to supports or for beams displaced vertically with respect to columns, the forces occurring (acting) in nodes (such as, supports) act with eccentricity on the bars for which an offset has been defined."
Sorri. I verry bad english. I don't undertan.
Hãy thử sử dụng google dịch \Try to use google translate http://translate.google.com/
Pleas hlep me. Pleas tutorial few picture. Pleas.