Free Web Tool · Offline Agent

Simply Supported Beam Design Agent

An offline reinforced-concrete design agent. Give it the span, loads and materials — it analyses the beam, sizes the flexural steel and stirrups, checks deflection to ACI 318, and shows its full reasoning trail. Runs entirely in your browser — no internet needed.

Beam Brief

Geometry
Materials
Reinforcement
Loads — service (un-factored)
a = distance from the left support. Self-weight (24 kN/m³) is added automatically. Strength combo: 1.2D + 1.6L.
What the agent does & assumes
  • Analysis: statics for reactions; shear & moment envelopes from the factored load (1.2D + 1.6L).
  • Flexure: singly-reinforced rectangular section, ACI 318 stress block; ρmin and tension-controlled limit checked; bars chosen in one layer.
  • Shear: Vc = 0.17√f′c·b·d (λ = 1, normalweight); design shear taken at d from the support face; stirrup spacing capped by ACI maxima.
  • Deflection: Branson effective inertia Ie; immediate live and long-term (λΔ = 2.0) deflections vs L/360 and L/240.
  • “Auto-design depth” keeps b, materials and loads fixed and raises h in 25 mm steps until every check passes.
  • Linear-elastic, preliminary design — not a substitute for a stamped engineering design.
RC Beam Design Agent
Ready.
Loading · Shear (kN) · Bending moment (kN·m) — factored
Designed section