Time history analysis for 2D frame with viscous damper  

This is benchmark test of time history analysis for simple 2D frame with viscous damper.
The OpenSees examples used for benchmarking can be found at the follwing URL:
opensees.berke...
OpenSees for Grasshopper wiki (now only in Japanese)
www.notion.so/...
Laboratory：esd.env.kitakyu...
Structural design office：dn-archi.com/