Version 3.0 - May 2025
STRUANG Studio Tecnico Ing. Alessandro Angelini
Tesimo (BZ) ITALY +39 3334750377
P.I.V.A. 02620670220
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Structural Engineering Solutions
BiaxialPro
Linear and non-linear analysis of complex cross-sections
🏗️ Introduction
BiaxialPRO is a structural engineering tool developed by STRUANG for complex cross-section analysis.
It allows the biaxial bending calculation of reinforced concrete and composite cross-sections using the fiber method and a high-level mesh definition.
The software supports generic composite materials, primarily designed for concrete/steel and timber/concrete elements, and provides comprehensive results including curvature, ductility, and crack-width calculations.
At the end of each analysis, users can export all relevant outputs in a detailed report.
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⚙️ Main Features
Linear and non-linear analysis of generic, non-homogeneous cross-sections (concrete, steel, timber, carbon, glass fibers).
Staged construction analysis for composite sections (e.g. composite deck beams).
Second-order effects for columns.
Beam analysis tools for beams and cantilevers under point and distributed loads (up to 6 load combinations).
Geometry types: rectangular, circular, T-sections, non-symmetrical composites, hollow or filled profiles, and custom geometries imported from CAD.
Geometrical properties calculation (centroid, ellipse of inertia, etc.).
Built-in Cross-section Wizard for standard RC and composite sections.
đź“Š Analysis and Output
Colored stress and strain maps for any type of analysis, with optional section cuts.
Ultimate cross-section resistance 3D domain with plotted external forces.
Ultimate resistance 2D domain for specific force sets (Mx, My, N).
Moment–Curvature diagrams for any biaxial bending direction, highlighting key stages such as concrete spalling, steel yielding, and ultimate failure.
Ductility calculation according to UNI EN 1998 (Italian Annex).
Crack-width calculation according to UNI EN 1992-1-1, using both rebar-stress and tensile-zone-based methods.
Shear stud connection analysis for non-homogeneous composite sections (including timber/concrete).
Comprehensive reports in Word, Excel, or text format, available in English, Italian, and German.
🧩 Materials
Steel: Elastic–plastic and elastic–plastic with linear hardening (EN 1993-1-14).
Concrete: Parabola–rectangle and modified parabola–rectangle laws (EN 1992-1-1, Annex L).
Rebars: Elastic–plastic and elastic–plastic with linear hardening (EN 1992-1-1).
Concrete confinement according to Eurocode 2.
Support for custom materials and multiple rebar materials within the same section.
🧪 Verifications
ULS and SLS checks according to UNI EN 1992-1-1.
A dedicated verification panel displays utilization factors for all combinations (unlimited).
Minimum and maximum reinforcement checks according to Eurocode 2.
🔄 Import & Export
Import/export of unlimited force combinations, reinforcement layouts, and cross-section geometries (DXF).
Cross-section mesh export in DXF format for further CAD processing.
🧮 Further Calculations
Concrete cover, anchorage, and lap length (EN 1992).
Column analysis and beam analysis (simply supported and cantilever).
Winkler beam and rectangular pad foundation analysis with reinforcement design.
Shear reinforcement design for rectangular RC sections.
Reinforcement area comparison by varying diameters, numbers, and spacing.
Dead load assessment for user-defined floors.
🧰 Input Data
Standard sections can be defined directly via interface; complex geometries can be imported from CAD (DXF).
ULS and SLS external forces can be entered manually or imported from external text files.
Standard material libraries are included, with the option to define user-specific materials.
🔍 Method of Analysis and Design Verifications
BiaxialPRO allows users to define various stress–strain relationships for different materials:
Steel: elastic–plastic and hardening behavior.
Concrete: linear or parabolic elastic behavior.
A new release (in development) will also include concrete confinement behavior according to Eurocode 2.
⚙️ Calculation Routines
BiaxialPRO currently offers three dedicated calculation routines for composite cross-sections, enabling users to perform accurate analyses across different material combinations.
These routines are customized and continuously developed according to user requirements, ensuring flexibility and adaptability to real design scenarios.
The development team is actively working on new routines that will significantly accelerate the analysis process for variable configurations of materials and geometries, making the software even more efficient and responsive to modern engineering challenges.
🧯 Crack Width Calculation (Detailed)
Implemented according to EN 1992-1-1:2004 §7.3.4, considering:
Equivalent rebar diameter
Rebar spacing and cover
Effective rebar area and tensile zone stress
Eurocode parameters (k1, k2, k3, k43)
Evaluation of cracked sections using two alternative cases based on rebar spacing
đź’ˇ Recommendations
BiaxialPRO is ideal for engineers performing everyday design and verification of reinforced or composite sections with complex geometries.
Its intuitive interface and CAD-based geometry input make it fast and practical.
It stands out for its ability to:
Handle any type of section (rectangular, circular, polygonal, or CAD-defined).
Model openings and embedded profiles with arbitrary geometry.
Support unlimited rebars, with customizable diameters and material properties.
Define custom material parameters (elastic modulus, strength, elongation).
BiaxialPRO combines advanced calculation capabilities with a user-friendly workflow, making it an essential tool for modern structural engineers.
🚀 Next Developments
We are committed to making BiaxialPRO one of the most advanced and reliable tools for section analysis.
Our current development plan focuses on key improvements, including:
Enhanced output reporting — more detailed, customizable, and interactive analysis results.
Advanced verification package for cold-formed sections according to EN 1993 (work in progress).
New geometry wizards to speed up section definition and input.
New calculation routines to accelerate the analysis of variable material and geometry configurations.
These ongoing developments reflect our goal to deliver a powerful, evolving software that keeps pace with the needs of modern structural design.
BiaxialPro Demo
Latest Version 3.3 - Oct 2025
A new version has just been released, check below the new features!
Version 3.0 - May 2025
Version 2.5.2 - Jan 2025
Version 2.5 - May 2023
Version 2.4 - Dec 2022
Version 1.0 - Feb 2020
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