zero lenght element performance

[behzad1980]

Hi,
1-Could u please tell me whether it is important to define i node as a master node and j node as a slave node in zero lenght element or not?

2-How can Opensees recognize that two nodes become close to eachother or far in zero lenght element?

3-Is positive local axes in zero lenght element in direction of axes whitch connect i node to j node?

Thanks

[fmk]

1. no .. it is a regular element .. a truss w/o length.

2. it will spit out a warning if they are not close, but it doesn't matter .. again the distance between nodes does not come into the equations .. remember it's a truss w/o length

3. yes,