To change this connection (node 2 in the diagram) to a hinge joint, we just need to change one of the member fixities to being FFF-FFR (as seen below).
Take a simple connection between two members: Once we understand our end fixities, it's time to model this in the software. If you want to restrict the movement along the local x-axis, simply model the following connection: This is an example of a hinge joint that can translate in the X. I have chosen this example because it is easy to understand and visualize the movement along the X-axis. On the right, we have Member 2, which for this example has a whole cut out of it that allows the node to slide along the X and rotate about the Z.
#WEBOTS HINGE JOINT MODEL CODE#
On the left, we have Member 1, fixed to the node with a restraint code of FFF-FFF. Now let's seperate the members to take a closer look: We can see they are joined by a common node. If it has a fixed degree of freedom, then the member is welded to the node - where the node goes, the member goes! Take the following two members: The best way to fully comprehend how connections work is understand how the nodes are connected to the member ends. This is proven by the fact that there is 0 bending moment at the connecting node, meaning that there is no restraint against bending moment. The member is not transferring any bending moment to the other member. You can see how the second member is free to rotate under an applied load. Take the following diagram:Īn example of a moving hinge joint/connection At the hinge, both members are able to rotate freely with no restraint.
Firstly, what is a hinge joint? A hinge connection allows two members to rotate around their connection.
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