- a negative temperature load Tc distributed uniformly over a cross‑section,
- a negative axial strain ε,
- a negative axial displacement Δl,
- a positive initial prestress V, or
- a positive final prestress V (in RFEM only).
Question
How do I apply prestress to tension members?
Answer:
To correctly combine the planned prestress with the other load cases, define a suitable load case and apply a "pulling" strain load to the members concerned. A pulling strain load can be, for example:The input by using the axial displacement is the most comprehensible input, as you can directly measure the displacement at the turnbuckle of the tension member.
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This article describes and explains the influence of bending stiffness of cables on their internal forces. Furthermore, the text provides information on how this influence can be reduced.
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