Hi Array. Thanks for the informationnI try to follow your following suggestion on a simple RC beamnfirstly select your concrete and rebar bodies and add named selection seperately for concrete and rebars. then add the line steel_mat_id=matid in your line bodies. Add the command mentioned below for REINF264 and you can post process it to view the model.nHowever, it seems that the rebar and the concrete is not connected as it is shown in the picture. Does this also happen to you?nAlso, how do you input the concrete strength? nBelow, I also attached my model with the model name REINF264 inside. Hopefully you can take a look. nThank you so muchnRegards, nRickynArraynn