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Thanks. To constrain the nodes with zero stiffness should I be using the equalDOF command? I am still getting the following error when I run my model in OpenSees: WARNING: numeric analysis returns 1 -- Umfpackgenlinsolver::solve WARNING AcceleratedNewton::solveCurrentStep() -the LinearSysOfEqn faile...

What's the best way to model a spring element with a defined spring stiffness in OpenSees? I am trying to model a load acing on a vertical spring, and I am currently using the ViscousDamper material and TwoNodeLink element to do so. This is producing and error in OpenSees and I am not sure why this ...

Hi everyone, I have a model of a simply supported beam and I am trying to model a human bouncing on the middle of the beam in OpenSees. In order to apply the human's damping and spring stiffness equivalent values, I have modelled uniaxialMaterial ViscousDamper, and a zerolength element at the middle...

Thank you that is a huge help!!

Hi all, I was hoping someone here might be able to point me in the right direction with a problem I am having on OpenSees. I am currently trying to use OpenSees to model and assess the dynamic response of a stadium to human induced vibration (ie if people at a rock concert are jumping up and down in...