Multiframe allows you to use two basic types of joints: joints that are completely "rigid", i.e. they can transmit moments, or joints that are "pinned" i.e. they cannot transmit any moment.

To set the joint type

§    Select the joint or joints to be pinned

§    Choose Joint Type from the Frame menu

A dialog box will appear with icons indicating the two types of joints.

§    Click on the icon which represents the type of joint you require

§    Click on the OK button

The joints in the Frame window which are now pinned will be drawn with a circle on top of the joint to indicate that it is pinned.

Pinned joints are most useful in situations where all or most of the joints in a structure cannot support moment transfer.  If you wish to model a situation where some of the members connected at a joint can transmit moment and some cannot, then you should use the Member Releases command explained below.