Slab Designer

Two-way panels, one-way slabs and flat slabs, with deflection and punching checks.

IS 456, ACI 318, EC2

Open Slab Designer

Open it at /civiltechstudio/slab-design/app. Status: live.

Quick start

Design a 3.5 × 4.5 m two-way corner panel in a 150 mm slab to IS 456, carrying a factored load of 12 kN/m² with M25 concrete and Fe415 steel.

  1. Under Design Code / Country, select India. Under Slab Type, select Two-Way.
  2. In Panel Geometry, enter Short span lx 3.5 m and Long span ly 4.5 m, and set Panel Type to Two adjacent edges discontinuous.
  3. In Loading, enter Factored load (w) 12 kN/m².
  4. In Section & Materials, enter Overall depth (D) 150, Clear cover 20 and Bar diameter 10 mm, Concrete grade fck 25 and Steel grade fy 415 MPa.
  5. In Serviceability & Detailing (optional), enter Service load (unfactored) 8 kN/m².
  6. Select Run Design.

Codes and standards

  • IS 456:2000 (Annex D coefficients, Table 26)
  • ACI 318-19
  • EN 1992-1-1

Inputs

  • Two-way: short and long spans, panel type (nine edge-restraint cases).
  • One-way: span and support condition. Flat slab: spans L1 and L2, column size.
  • Loads, thickness, materials, cover.

Outputs and exports

  • Design moments, steel areas, minimum-steel governance, deflection (span/depth), punching shear.
  • Exports: PDF and Excel report.

Limits

  • Annex D two-way coefficients apply to panels with ly/lx ≤ 2; a longer panel acts one-way, so design it as one.
  • Flat slabs use the direct design method.