zerolength element with asymmetric material

[xieyazhou]

In the case with asymmetric material (i.e., the tension and compression sides have different backbone curves), does the node order (i.e., the ith and jth node) matter in the definition of zero-length element? If so, what is the basic rule?

Thanks in advance,
Yazhou

[selimgunay]

zerolength element has local axes with positive and negative directions, tension and compression sides define on the local axis positive direction. Please see the below link for local axes

http://opensees.berkeley.edu/wiki/index ... th_Element