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Concrete Structural Calculator

Design beams, columns, and shear walls with accuracy and ease.
Start your project in minutes.

Choose Your Design Module

Select the type of concrete member and start designing instantly.

Beam

Beam

Designing RC Beams for Bending and Shear Checking Confinement and Rebars Lateral Restraint Based on NZS3101 Amd.3
Column

Column

Designing RC Columns for Axial Load, Bending and Shear Provide Interactive P-M interaction Curves Checking Confinement and Rebars Lateral Restraint Based on NZS3101 Amd.3
Shear Wall

Shear Wall

Designing RC Walls for Axial Load, Bending and Shear Designing Boundary Elements Provide Interactive P-M interaction Curves Checking Confinement, Rebars Lateral Restraint and Wall Hoop Based on NZS3101 Amd.3

Why OptiStruct?

OptiStruct provides professional-level tools to design and optimize concrete members quickly and accurately. Whether you are an engineer, student, or consultant, our modules simplify calculations and ensure compliance with NZ building codes.

User-Friendly

Intuitive interface with guided inputs for effortless calculations.

Accurate

Calculations based on international concrete standards and NZ regulations.

Flexible

Supports beams, columns, and shear walls with detailed rebar and analysis options.

Powerful Engineering Workflow

From manual calculations to fully automated structural design — OptiStruct adapts to your workflow.

Manual Calculation Transparency

View detailed step-by-step structural calculations including bending capacity, shear resistance, axial checks, and interaction diagrams. Every formula is traceable, allowing engineers to verify assumptions and maintain full technical confidence.

  • Step-by-step design equations
  • Visible intermediate values
  • NZ code compliance references
Manual Calculation View ϕMn = ϕ As fy (d - a/2) a = As fy / (0.85 fc' b) fc' = 30 MPa As = 1256 mm² d = 460 mm ϕMn = 214 kNm Section Analysis

Automatic Load Combination Engine

Input axial loads, bending moments, shear forces, and load cases. The system automatically generates governing combinations and evaluates critical design conditions.

  • Ultimate & serviceability checks
  • Envelope generation
  • Instant recalculation
Automatic Load Combination Engine Load Cases LC1: 1.2D + 1.5L LC2: 1.2D + 1.0E LC3: 0.9D + 1.3W LC4: 1.2D + 1.5L + 1.0E Governing: LC4 Envelope Result Max Moment

Smart Reinforcement Optimization

The system automatically selects optimal rebar diameters, spacing, and layout configurations based on section geometry and design constraints.

  • Bar diameter auto-selection
  • Spacing compliance checks
  • Confinement design
Smart Reinforcement Optimization Required As: 1210 mm² Selected: 3Ø20 = 942 mm² +2Ø16 = OK Optimized Section Layout

Professional Report Generator

Generate structured PDF reports including input summary, calculation details, diagrams, and compliance notes — ready for client submission or council approval.

  • Engineer-ready formatting
  • Calculation breakdown included
  • Print & share instantly
Professional Engineering Report OptiStruct Structural Design Report Section: 400x400 Column Concrete: 30 MPa Steel: 500 MPa ϕPn = 1420 kN ϕMn = 215 kNm Status: PASS ✔ Generated automatically • Code compliant • Ready for submission PDF

Choose Your Plan

Flexible plans designed for structural engineers and consulting firms across New Zealand.

Free

$0 /month
  • ✓ Beam Design Module
  • ✓ Limited Calculations
  • ✓ Basic PDF Export
  • ✗ Column & Shear Wall
  • ✗ Professional Verification
Most Popular

Professional

$49 /month
  • ✓ Beam, Column & Shear Wall
  • ✓ Unlimited Calculations
  • ✓ Advanced Code Checks (NZ)
  • ✓ Detailed Engineering Reports
  • ✓ Project Save & History

Enterprise

Custom
  • ✓ Multi-User Access
  • ✓ Company Workspace
  • ✓ Priority Support
  • ✓ Custom Branding Reports
  • ✓ Dedicated Account Manager
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