Structural Engineering
Simplified.

Column Interaction Diagrams

Our column calculator uses the Strain Compatibility Method to generate the full P-M interaction envelope. It accounts for the Whitney Stress Block parameters, strength reduction factors ($\phi$) transitioning from 0.65 to 0.90, and the maximum axial load cap ($0.80 P_o$).

• Calculate Demand/Capacity (D/C) Ratio
• Check Compression vs. Tension Controlled
• Analyze Rectangular Sections with Side Bars

Beam Shear & Moment

Perform rapid analysis of simply supported beams. The engine calculates shear ($V_u$) and moment ($M_u$) diagrams based on factored load combinations (1.2D + 1.6L). It also checks serviceability using the Effective Moment of Inertia ($I_e$) for immediate deflection.

• Automatic Self-Weight Calculation
• Flexural Reinforcement Design ($A_s$)
• Shear Stirrup Spacing Checks

Spread Footing Analysis

Design isolated square or rectangular footings. The tool verifies soil bearing pressure ($P/A \pm M/S$) against allowable capacity ($Q_{all}$). Crucially, it performs the Two-Way (Punching) Shear check at distance $d/2$ from the column face, considering interior, edge, or corner conditions.

Retaining Wall Stability

Ensure stability of cantilever retaining walls. The calculator uses Rankine Earth Pressure theory to determine lateral active ($K_a$) and passive ($K_p$) forces. It calculates Safety Factors for Overturning and Sliding, and checks bearing pressure at the toe.