How to control an overpressed joint in the ridge?

Answer

An overpressed joint between two members can be controlled in RFEM by means of the member stress results. For members, this stress result represents the effective stress as a color gradient across the member surface depending on the assigned cross-section.

Figure 01 - Stresses on Members

Based on the local member axis, the member stress result gives the following stress components and reference stresses with an associated color palette:

  • Stress
    • σx
    • τy
    • τz
  • Elastic stress component
    • σN
    • σMy
    • σMz
    • σN+My
    • σN+Mz
    • σM
  • Elastic equivalent stresses
    • σv,Mises
    • σv,Tresce
    • σv,Rankine
    • σv,Tresca+Rankine
    • σv,Bach

Using active displaying for the members connected to the joint, and displaying the σx stresses, it is possible to visualize the state of stress on and thus also between the members. If only negative stresses occur in the area between the members, the joint is overpressed.

Keywords

Joint Upper flange Truss Rafters Pressure-contact joint

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