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Method of Joints Query

Method of Joints Query

Method of Joints Query

(OP)
Hello all,

I have recently been attempting to refresh my memory in regards to method of joints and have been making some reasonable progress, however I have ran into a stumbling block that has left me quite puzzled.

I have been using the Skyciv truss calculator to verify my work and for the 1st analysis shown below I am fine and have no problems working out all the forces. However, in the 2nd analysis when I add further members, I cannot understand how the force values in each member are the values stated. Supports are at A & B, with an external force applied to D at 45 degrees.

Could someone possibly shed some light on how this works please?


RE: Method of Joints Query

The additional members in the second analysis are redundant. In order to calculate forces, you would need to consider compatible deformations which means you would need to know their area relative to the area of the members of the first analysis. You cannot calculate the forces using the method of joints because the structure is indeterminate.

BA

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