Automatically calculate and report Distributed wall reactions

Tekla Structural Designer
2021
Tekla Structural Designer
2020
Tekla Structural Designer
Distributed Wall Reactions
Environment
Australia
British Standard
Eurocode
India
USA
Not environment-specific

Distributed line (force/ unit length) reactions are now automatically calculated and reported for all wall types; Meshed, Mid-pier, Bearing and  General.  A new button for these has been added to the Reactions group of the Results Ribbon as shown below.  This distributed reaction is a more useful way of communicating foundation loads for foundation design.

Image
tsd-distributed-wall-reactions-01.png


Distributed wall reactions are:

  • A continuous line reaction along the length of the bottom of the wall
  • Available for all structural wall types and all Head Codes
  • Applicable to the vertical (Fz) component of the discrete analytical wall reactions of meshed walls
  • Available for all result types except Envelopes and Seismic RSA
  • Reported only for the horizontal bottom levels (analytically) of self-supported walls
  • Derived from elastic theory formulae which are used to calculate stress/unit length based on the total moment and vertical force acting at the centroid of the reaction line.
    • (This assumes that the wall and foundation material are sufficiently homogeneous and isotropic to allow for load distribution according to the Saint-Venant's Principle)

Graphical Results - Distributed wall reactions can be viewed in the Results View as follows:
  • The new Distributed wall reactions filter button is active only when Fz is selected in the reaction type drop-down list (Fz, Fxyz, Total). 
  • When active, the discrete vertical reactions of the wall (1D and 2D) supports are hidden.  Note also that the distributed reaction is not displayed for walls in a core when Core reactions are active.
  • The cursor tooltip gives the reaction length and the force/length values at each extreme.
  • The graphical representation of the distributed reaction is typically the same colour as other reactions.  An orange colour indicates a high nodal force concentration - more information on this is then listed in the tooltip.
Drawings - Distributed wall reactions can be included in the Foundation Reactions drawing as follows:
  • A new Layer Settings option is added in Draw > Settings > Layer Configuration for the Foundation Reactions drawing - “Foundation Reaction values” in the set of controls for Walls (on by default).
  • A new summary table of Distributed wall reactions can also be included, the borders, text and notes for which are controlled by the existing “Notes” and “Tables” Layer Configuration options.
    • Note the text colour and size of the reaction values in the drawing is controlled by the “Foundation Reaction Values” Layer Styles item for the Foundation Reactions drawing.
  • New options are also added to  Draw > Settings > Options > Planar Drawings > Foundation Reactions > Walls  to control their inclusion as shown below.
Image
tsd-distributed-wall-reactions-02.png


A summary table of reaction values can be included (see picture below).

Vertical reaction values can be shown on each wall, the options for these being:
  • Distributed (maximum): Maximum value UDL,
  • Distributed (Average): Average value UDL,
  • Distributed (Extremes): Calculated linear UDL/VDL extreme  values
  • Total - Integrated total
Note that the new Layer Configuration options described above will be active by default in new models - for existing files you can load the new default settings by selecting the Load… button in the Drawing Settings dialog.

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tsd-distributed-wall-reactions-03.png


Image
tsd-distributed-wall-reactions-04.png

 
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