The user must assign a single controlling section geometry which will apply to all spans (special note #6 in Concrete Beam Sections).įor example, when a multi-span beam has differing clear spans, the table displays a T-Beam geometry line item for each condition found: When varying conditions are discovered, the user will be presented with multiple geometry conditions to choose from. This includes detecting whether the beam falls at an edge condition, and invoking the applicable ACI criteria accordingly: ln / 12 One-twelfth of the current clear span (n)ĮNERCALC for Revit checks each of these criteria automatically, and the criterion found to control effective width for each respective side is indicated in the 'Condition' column.

In the case of an edge beam, the effective width on ONE SIDE is taken as the least of: ln / 8 One-eighth of the current clear span (ln).sw / 2 Half the clear distance (sw) to the nearest adjacent beam web.In the case of an interior (non edge) beam, the effective width on EACH SIDE is taken as the least of: In ACI 318-14 and -19, these provisions are displayed in Table 6.3.2.1 ' Dimensional limits for effective overhanging flange width for T-beams'. The 'Side 1' and 'Side 2' conditions displayed in the table are computed from physical conditions in the Revit model using the ACI 318 criteria for concrete T-Beam effective width. In addition, the table also displays any T-Beam section geometry detected from the model, as well as an option for the user to manually override the effective width conditions.

Clicking the 'Select' button of any other row in the table will launch the concrete beam calculation with the T-Beam geometry shown in that row.Īs discussed in Rectangular Beam Sections - Joined, the table always includes an option to skip T-Beam behavior. Using the 'Select' button on the row marked 'Skip' and 'No T-Beam' will launch the calculation as a rectangular beam without any Tee geometry. When the calculation launch process reaches the 'Section Geometry' tab, the user will be informed that the beam IS eligible for design as a T-Beam.

If the beam and slab are not joined, the launched process will behave as described in Rectangular Beam Sections - Unjoined.Īn example of a concrete beam joined to a slab was previously illustrated in Rectangular Beam Sections - Joined: Concrete beam calculations may be launched with T-Beam geometry IF AND ONLY IF the beam and slab have been joined to each other.

Enercalc concrete beam cracked section