Why does Compression-only point spring support show Tension reactions in Construction Stage Analysis?

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Answer:


The first step is to cross-check the direction of compression-only point spring support.

If it's correct, then we need to check how it is behaving in Construction Stage(CS) Analysis.

The reaction magnitude and direction generated at comp-only point spring support in CS analysis depends on different parameters.
1) Resultant force (Summation of all loads) direction in particular CS-stage.
2) Whether comp-only spring-support is activated in Original or Deformed position.
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Parameter 1


Parameter 2




kindly refer the attached files, where the influence of these parameters is explained in detail.