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Does OpenSees have any of these kind of commands or any alternatives to set the initial velocity and acceleration of nodes?

Thank you

dear all: i have 2 questions: 1. if a section is of a concrete rectangle slab and steel wide flange section girder, like this ------------ | | ------------ ---- ---- | | ---- ---- how to simulate this section in opensees. Can I just define two elements between two nodes? 2. in the command [b]uniaxia...