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In a mixed system of members and surfaces, I have a frame whose beams have member end hinges. The moment diagram of the horizontal beams looks strange.
What is the reason for this?


If the horizontal beams and the surface are in the same plane, they are firmly connected to each other.

Although the member end has a member end release, it is already rigidly connected to the surface in the next FE element and shares the load transfer with the surface by means of bending. To avoid restraint moments, the surface must also have a line hinge.


Member hinge Bending moment Result diagram Mixing system

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