The OpenSees Community

You might be making some mistakes while applying the equaldof constraint. Could you post the part of your tcl file that applies the equaldof?

Yes, concrete can be defined with two rectangular patches and reinforcement can be defined with the layer command. Please check "patch rect" command and "layer straight" command.

http://opensees.berkeley.edu/wiki/index ... ch_Command
http://opensees.berkeley.edu/wiki/index ... er_Command

You can first make everything elastic and check if your equilibrium calculations are correct.

As you are using a zerolength element, you don't need to worry about the local and global coordinates. The rotational spring will automatically consider the slope of the beam because the zerolength element is connected to the beam. Therefore, you can define your zerolength element in the same way as...

From equilibrium, some of the external horizontal forces above a story should be equal to the sum of the column shear forces and the horizontal components of the truss forces. Isn't this what you are getting?

Because, in the case of the RC frame infill, horizontal components of the diagonal truss axial forces contribute to the total base shear. If you consider those forces in your calculations, you should achieve equilibrium.

The BuildRCrectSection.tcl file in the following link defines a reinforced concrete rectangular section. You can use it as guidance to develop your T section. Please let me know if you have questions. http://opensees.berkeley.edu/wiki/index.php/OpenSees_Example_5._2D_Frame,_3-story_3-bay,_Reinforced...

You can use an Elastic-Perfectly Plastic Material with large initial stiffness.

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

Getting an integrator error at the first time history step does not seem to be normal. Your initial integration algorithm may not be an appropriate one, you may be using an explicit algorithm that does not satisfy the stability criterion. If the analysis continues all the way with the other algorith...

Having a sloped beam does not restrict the usage of equalDOF command for a zerolength element. You can still use a zero-length element at the end of your sloped beam (you need to define two nodes with same coordinates), assign a rotational spring in the M2 direction and constrain all the other dofs ...

Hello,

The relevant displacement calculations are conducted in the ForceBeamColumn3d.cpp file.

Selim

Yes, we use beam with hinges element, because we want to consider both the removal of the infill wall and its IP/OOP interaction. I don't have Hashemi's tcl files, so I don't know the answer to all the questions but most probably struts are considered both for gravity and time history analyses. I th...

Hashemi and Mosalam (2006) used truss element and Concrete01 material to model an infill wall as a diagonal strut and obtained reasonable match with the shake table results. In that sense, it can be considered as a simple enough and reliable approach. The element removal approach of Gunay and Mosala...