actually what we r doing is we first made a simple beam with two point load......we added concrete, steel, wrapping material n 3d interface as materials.........now for we made applied wrapping at the bottom for that we made a macro element of 1mm thickness at bottom for 3d interface n 3mm below this macro element for wrapping.......... now while adding properties for interface macro element the 3d interface is not visible it only has concrete n steel..... if allow i can mail u the file of the modelling that i done...thanks....

thank you very much .

Please ask specific questions.

In general, the modelling is very similar to 3D, just note there are no shell elements in 2D and the mesh generator in ATENA 2D only creates compatible meshes at macroelement interfaces, which means the reduction of the total number of elements compared to 3D will be smaller than in most other cases.