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Dear All: I have a question about how to use rigid diaphragm (eqDOF) in a 2D RC frame model. I have a 5-story RC frame, I modeled beams and columns using forcebasedbeamcolumn elements. In order to apply the rigid diaphragm assumption, I used eqDOF to force all beam-column joints at each story move i...

Hi, All: I am trying to apply a initial velocity to a SDOF system. What I did was I built a SDOF system with a linear zero-length spring. Then I applied imposed motion with initial velocity and initial displacement (0) to the mass point by MultipleSupport input. OpenSees gave me error "FATAL Fu...

Hello, I want to build a elastic beam-column with considering the shear effect. I saw there are two ways to do this: 1, use elastic Timoshenko beam, there is a shear area option. And the value for rectangular section is 5/6. 2, use forcebeamcolumn element with an elastic section. In the section, the...