ACI Beam Detailing (Figure 5) Exact-Style + BBS

ACI Figure 5 — Beam Detailing + Sections + Site BBS (with Joint Diagram)

Exterior top bar length (site) includes: max(0.25L, min) + effective column embed + hook (with cover logic).

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Inputs —

L1 clear span (mm)

L2 clear span (mm)

Beam width b (mm)

Beam depth D (mm)

Effective depth d (mm)

Column/support size (mm)

Main bar diameter db (mm)

Stirrup bar diameter dt (mm)

Detailing mode Non-seismic (typical) Seismic / ductile (tighter confinement)

Negative bar rule 0.3L (typical) 0.25L (alternative)

Stirrup spacing S1 (mm) (confinement)

Stirrup spacing S2 (mm) (center)

Development length Ld (mm)

Hook type Custom (use input) 90° (12db) 135° (16db)

Hook length input (mm)

Column position Exterior column (minus 1 side cover) Interior column (minus 2 sides cover)

Column clear cover (mm) (to stirrup)

Effective cover = colCover + dt + 0.5db

Use cover in BBS length? Yes (recommended) No (use full column width)

Minimum top bar extension into span (mm)

0 = use 0.25L automatically.

Concrete cover (mm) (for joint sketch label only)

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Bar quantities (sections + BBS)

Bottom bars (qty)

Top bars at EXT/END (qty each)

Top negative bars at INT. END (qty)

Extra bottom bars at INT. END (qty add)

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Result (Figure 5 + Sections + Joint) —

Beam–Column Joint Diagram (Exterior End)

Shows: top into span + effective embed inside column + hook.

Section-Based BBS

Grouped by EXT / CENTER / INT / END. Exterior top bar uses cover logic.

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