My problem is to simulate two beams connected at an included angle. The diagram is shown below.
The first beam is hinged on the ground, and the rotation is restrainted by a rotation spring with stiffness coefficient 
. The second beam is connected with the first beam via a pin joint and the rotation stiffness is 
.
In other FEM softwares, I know I can use MPC to achieve the connection between these two beams. But I didn't find a similar functionality in COMSOL. How can I simulate my problem. My goal is to investigate the effect of the included angle and spring stiffness on the natural frequencies of this system, so I want to perform a parametric study. A simple example file would be highly perfered and appreciated.
Best Regards