Design two-way slabs using the Direct Design Method (DDM) with moment distribution to column and middle strips. Use for flat plates, flat slabs, or waffle slabs with aspect ratio < 2. Compliant with ACI 318-19 §8.10. Free to use. SI and Imperial units supported. No signup required.
This calculation is for preliminary design verification only. All results must be independently verified by a licensed professional engineer before use in construction documents.