Beam Section Design - Beam Tab

Beam Section Design - Beam Tab

General

Beam Section Design allows user to access beam reinforcement data, beam report and etc.

To access Beam Section Design, user can either:
  1. Select a beam, then click on "Section Design" under Beam tab, or
  2. Select a beam, right click to access shortcut menu and click on "Section Design.

  Beam Section Design  consists of two tabs: 
  1. "Beams” tab
  2. "Rebars” tab

Beams Tab

In  “Beams” tab,  geometric data and 3D views of the continuous beams will be displayed here. The beam clear span length and center to center length are contained in this table editor.
Here we may find 3 sections:
  1. Toolbars :
    1. Interactive Design :  To view/edit the forces (moment, shear, torsion) in the selected beam from the analysis results. More explanation can be found below this section.
      (Alternatively, double left click on the beam in the       Axis and Beam Data Editor to access Interactive Design dialogue.)
    2. Side View and 3D View : To reset the display view of the beam(s) to either side view or default 3D view angle.
    3. Ok and Cancel : Ok to apply change, cancel to exit without preserve any changes made.
  2. Axis and Beam Data Editor : geometric data of the beam(s) will be presented here including beam support information, beam concrete and steel grade, span length and beam section dimension. User may edit beam section here as well.
  3. 3D View : To display the selected beam. If it is a continuous beam, full continuous beams will be presented together with the columns in this view.
Amending beam dimension is for a rough/quick check only. It is not recommended to edit geometric data here as it will invalidate the analysis result which means Building Analysis is required to re-run to ensure valid analysis result. Therefore it is better to adjust beam dimension at the beam property. 

Beam Interactive Design

The forces for each of the six regions can be displayed here.

All the forces will be based on the load Envelope.
Values for K, K’, x, As, and As’ are then all calculated for each region and are also shown in the same table.

Where the ratio of K/K’ is less than 1.0 no compression steel is required.

The effective depth  " h’ " to the centre of the bars is worked out separately at each location. This is automatically reduced if the steel doesn’t fit in a single layer.

You can control this calculation via the Design tab of  "Beam Design Settings" as shown below:


The tension steel area (As) and compression steel area (As’) are calculated for all moment values while links are calculated for shear and torsion as provided in the corresponding fields.

By checking the "Edit Manually" option at the right bottom corner, these values are editable. In other words, these fields can be used for calculating the steel for any given design moment. Editing moments fields will dynamically re-calculate and update the required steel areas, thus redesign of beam steel design is required. However, if this option is ticked, the "Analysis Result Diagram" of the beam will be invalid (not able to open).
Only the shear force value at the supported end of the cantilever beams will be taken into account during the shear design. Links based on this shear force value (Vd) will be used throughout the span of the cantilever beam.
The dialog will be closed and any modifications will be saved if the “OK” button is pressed. The “Cancel” button will also close the Reinforcement Design Dialog, and the changes will be discarded.

The contribution of the bent-up bars (if they exist) in the shear resistance of the beams are ignored.

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