Failure of Nodal Supports

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If nodal supports are only to act in certain directions, a failure can be defined. As an example, consider a single-span beam whose right support can only support positive vertical loads. The load consists of a vertical suction load and a horizontal load. However, there are 2 options for failure:
1) "Failure if PZ 'negative"
2) "Failure all if PZ 'negative"
The difference should be illustrated in the graphic.

If, in option 1), horizontal forces are still absorbed even after the vertical failure of the support, the support fails completely with option 2). Therefore, the correct nonlinearity should be selected depending on the given situation.

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