In structural engineering, standard shapes like wide-flange beams, channels, angles, and standard tubes are usually sufficient for routine designs. However, this real-world projects frequently demand non-standard, composite, or heavily customized built-up sections to handle extreme loads, geometric constraints, or specific architectural requirements. Calculating the section properties—such as moments of inertia, torsional constants, neutral axes, and plastic moduli—for these complex geometries by hand is notoriously tedious and prone to human error.

This is where advanced utility programs like Section Wizard (frequently integrated with suites such as Bentley STAAD.Pro) become indispensable tools for modern structural engineers.

What is Section Wizard?

Section Wizard is a powerful, finite-element-based utility tool designed to create, analyze, and generate properties for arbitrary, custom, and built-up cross-sections. Rather than being restricted to predefined library shapes, engineers can define virtually any cross-sectional shape imaginable—whether it involves welded steel plates, concrete encased profiles, cold-formed sections, or multi-material composite members.

The software functions as an independent module or a seamless plugin within comprehensive structural design environments. By computing exact geometric and elastic-plastic properties, it bridges the gap between raw architectural geometry and rigorous finite element analysis (FEA).

Core Features and Capabilities

Section Wizard provides a robust environment equipped with several specialized features tailored to structural workflows:

• Arbitrary Shape Modeling: Engineers can draw or assemble complex polygons using basic geometric shapes, lines, arcs, and standard structural profiles.
• Multi-Material Support: The tool handles cross-sections comprising different materials (e.g., steel and concrete in composite bridge girders or encased columns), automatically accounting for modular ratios and transformed section properties.
• Comprehensive Property Generation: It calculates a full suite of cross-sectional properties required for analysis, including:
  • Cross-sectional area ($A$A)
  • Moments of inertia ($I_y$Iy​, $I_z$Iz​, $I_{yz}$Iyz​)
  • Torsional constant ($J$J) and warping constants
  • Elastic and plastic section moduli ($S$S and $Z$Z)
  • Radius of gyration ($r_y$ry​, $r_z$rz​)
  • Shear centers and principal axes orientation
• Automatic Finite Element Meshing: The software features an auto-meshing engine that discretizes user-defined polygonal boundaries with simple mouse clicks, ensuring accurate stress and strain distribution calculations.

The Typical Workflow in Section Wizard

Using Section Wizard generally follows a structured engineering workflow, ensuring that custom profiles are accurately translated into analytical models:

1. Defining Geometry

The user opens the Section Wizard environment either as a standalone utility or directly from an analysis platform like STAAD.Pro. Profiles can be built by pulling standard shapes from international steel databases and combining them with custom plates, bars, or user-defined polygonal outlines.

Bentley Software Documentation

2. Assigning Materials and Properties

For composite or hybrid sections, distinct material properties (such as elastic modulus, Poisson’s ratio, and yield strength) are assigned to each component region. This step is critical for capturing correct stiffness behavior under combined bending, axial, and torsional loads.

3. Meshing and Analysis

Once the geometry and materials are locked in, the program automatically generates a fine finite element mesh across the cross-section. It then executes internal numerical integrations to solve for all primary geometric and stress-related parameters.

4. Exporting to Analysis Software

The computed properties—such as modified areas, inertias, and section dimensions—are exported back into the primary structural model. The main analysis engine then uses these custom properties to evaluate member forces, deflections, and code compliance under various design load combinations.

Practical Engineering Use Cases

Section Wizard is heavily relied upon across multiple sectors of civil and structural engineering:

• Heavy Industrial Structures: Industrial plants often require heavy crane girders built by welding cover plates to standard I-beams or channels. Section Wizard accurately captures the enhanced torsional and flexural capacities of these custom built-up sections.
• Bridge Engineering: Composite steel-concrete bridge decks or plate girders benefit immensely from Section Wizard’s ability to evaluate transformed sections, helping engineers optimize flange and web dimensions.
• Retrofitting and Rehabilitation: When strengthening existing steel or concrete columns by adding steel jacketing or cover plates, engineers use Section Wizard to determine the updated capacity and stiffness of the retrofitted member.
• Cold-Formed Steel Design: Cold-formed sections often feature complex lips, stiffeners, and radii that fall outside standard hot-rolled tables. Custom modeling allows precise cross-sectional evaluation for buckling and local instability checks.

Advantages Over Manual Calculations

Relying on manual formulas or simplified hand approximations for complex shapes introduces significant risk, particularly regarding torsional properties (St. Venant torsion and warping) and shear center locations. Section Wizard eliminates these risks through rigorous finite element calculation.

Furthermore, its integration into major analysis software packages saves hours of data entry. Instead of manually typing dozens of derived geometric parameters into an analysis file, engineers can push data back and forth with a few clicks, streamlining design iterations and value engineering tasks.

Conclusion

In an engineering landscape where projects continually push architectural and structural boundaries, standard section tables are frequently insufficient. Section Wizard empowers structural engineers to transcend these limitations, offering the flexibility to design, analyze, and implement custom and composite cross-sections with absolute confidence. By automating complex finite element computations and integrating smoothly with major design software, it remains a vital asset for achieving safe, efficient, explanation and innovative structural designs.