Intergraph® GT STRUDL®

Intergraph’s structural analysis and design modeling software is used by structural engineering professionals for concrete, steel, and reinforced concrete design of structures.

Intergraph GT STRUDL, blue steel structure

For nearly 40 years, GT STRUDL® has offered structural engineers a complete design solution, and we’ve now incorporated 3D CAD modeling and 64-bit high-performance computation solvers into all versions. The structural analysis software is a high-quality, fully-integrated, database-driven system for comprehensive frame and finite element analysis and steel and reinforced concrete design.

GT STRUDL includes all the tools necessary to analyze a broad range of structural engineering and finite element analysis problems, including linear and nonlinear static and dynamic analysis, and it can do so accurately in a fraction of the time of most other solutions. The new CAD modeler user interface has an AutoCAD-based environment that allows structural engineers to instantly see analysis and design results.

Structural Analysis and Engineering You Can Trust

Create Lean Designs

Find the perfect balance between a lean design and safety.

Reduce Man Hours

The complex 64-bit solver allows for advanced structural analysis and engineering in a fraction of the time of most other software.

Put Safety First

We’ve never skimped on safety and have included design codes from all over the world to ensure that your design and analysis are accurate and safe.

GT STRUDL furthers the mission of listening to our customers and creating solutions that fit their needs. GT STRUDL 2016 is the tool structural engineers can use to create safe designs faster without time-wasting errors.

President Rick Allen
Intergraph CADWorx & Analysis Solutions

Enjoy these great features

Plays well with others

Imports / exports models via CIS/2, allowing structural data-rich models to fully leverage GT STRUDL's power

Starts smart

Don't build from scratch; pre-populated common structural analysis templates are up-to-code and accurate

Verified to work

Validated for its computational quality and performance by more than 350 Base Verification test problems

Feature-rich integration

Has fully-integrated, database driven software system for general frame and finite element analysis / comprehensive structural engineering design

User documentation, support

Offers online training and full support staff to take calls, personally answer emails

Optimized steel design

Provides structural engineers the ability to perform steel member design and global code checking

Intuitive Base Plate Wizard

Execute complex steel base plate modeling, linear and nonlinear analysis, and performance evaluation

Easier concrete design

Design beams, columns, one-way slabs, shear walls, and two-way flat plate and flat slab structures per ACI 318

Offshore jacket / pile analysis

Analyze and model environmental loadings: wind loads, cyclic wave loads, current loads, buoyancy loads, launching / lifting load

GT STRUDL Product Resources

Operating System Compatibility

Note: The operating system compatibility details that follow refer to the latest released version of this software. Previous versions of the software may not work with newer operating systems.

Microsoft® Windows®-compatible.

Intergraph Recommended System Requirements:

  • Processor: 3.0 GHz Intel Pentium IV or higher. AMD Athlon dual-core processor or higher
  • Memory: 2 GB RAM or higher (Windows XP) or 4 GB RAM or higher (Windows 7/8)
  • Display: 1280x1024 or higher, with True Color
  • Video Card: 256 MB or greater video RAM, OpenGL 1.1 or later, DirectX 9.0 or later, drivers updated with the latest manufacturer's drivers (Motherboard-integrated video cards not recommended for desktop systems)
Multiple Analysis Modalities


GT STRUDL offers comprehensive frame and finite element analysis tools for the linear and nonlinear static and dynamic analysis of general 3D structural problems. You can take advantage of five member types and an extensive library of finite elements based on a broad range of:

  • Plane strain
  • Plane stress
  • Pure plate bending
  • Shell
  • Solid element formulations
Integrated Analysis

Engineers can create structure models consisting of appropriate combinations of the various member and finite element types that best meet the analysis requirements of the engineer-analyst.

The breadth and depth of functionality enables engineers to analyze the broadest range of projects, from the simplest to the most complex structural models. Regardless of the project size, GT STRUDL produces accurate and reliable results, often in a fraction of the time of other programs.

Modeling Capability
  • Linear and nonlinear static and dynamic analysis
  • High performance static and dynamic analysis equation solvers
  • Lanczos Eigen value solver, including the ability to specify computation convergence tolerances
  • Sturm sequence, error estimate, and two orthogonal checks
  • User-defined translation and rotation mass
  • Active/Inactive mode selection
  • Response spectrum analysis
  • RMS, PRMS, CQC, Absolute, Algebraic, Ten-Percent, Double Sum, and Grouping mode combination methods
  • Gupta and Lindley-Yow mode combination methodologies
  • Missing mass load generation
  • Broad range of user-specified damping properties, including modal damping, composite modal damping, Rayleigh damping, damping matrix, and viscous damper elements
  • Composite modal damping ratio calculations
  • Time-history dynamic analysis
  • Maximum response harmonic analysis for individual frequencies or for a range of frequencies (i.e., frequency sweep analysis)
  • Steady-state dynamic analysis
  • User-controlled and variable integration time steps
  • Nonlinear pushover analysis
  • Nonlinear spring elements, support and member end springs, tension, compression-only members, large sag catenary, and parabolic cables
  • Nonlinear fiber element plastic hinge and plastic zone member models
  • Base isolation friction-bearing damper element
  • Structural analysis database management
  • Automatic mesh generation in cartesian, cylindrical, and spherical reference frames
  • Scalable problem size modeling
  • Broad range of static and dynamic loading types
  • Integer and alphanumeric naming
  • Model error detection
Comprehensive Steel Design

GT STRUDL Comprehensive Steel Design

Structural engineers can perform steel member design and code checking to meet a large variety of global steel design codes dating back to the 1960s. These details are extensively documented, enabling the engineer to review the details of the code-checking procedures.

With GT STRUDL, engineers can manage the steel member design and code-checking process through a large number of control options, including:

  • Control parameters
  • Specification of absolute and relative geometric constraints
  • Member size smoothing options
  • Automatic analysis and design iterations
International Members Design Codes

In addition to approximately 80 pre-defined tables of steel shapes, engineers may also define and store custom shapes in user-defined tables.

GT STRUDL steel design offers a variety of international steel design codes, including American, European, Canadian, British, and Indian codes for onshore steel frame structures, and American, ISO, and Norwegian codes for offshore jacket design.

Design Capabilities:
  • Structural steel
  • Transmission towers
  • Offshore jackets
  • I, T, channel, single/double angles, pipes, tubes, bars, and others
Special Steel Features

Users benefit from a variety of steel design capabilities, including the following:

  • Steel design wizard
  • Automatic analysis, design, and member smoothing
  • Absolute and relational geometric constraints
  • Automatic member self-weight calculations
  • Effective length factor calculations
  • Member deflection check and design
  • Material quantities report
  • Fillet weld design
  • Default and user-defined tables of steel shapes
International Design Codes


GT STRUDL steel design offers a variety of international steel design codes, including American, European, Canadian, British, and Indian codes for onshore steel frame structures, and American, ISO, and Norwegian codes for offshore jacket design.

American Steel Design Codes

  • AISC 14th, 13th, and 9th Editions
  • AISI Cold-formed Steel for UNISTRUT shapes
  • ANSI/AISC N690 2012, 2006, and 1994 Editions
  • ASME BPVC Subsection NF 2007 and 2004 Editions
  • ASME BPVC NF 2007, 2004, 1983/1985, and 1977/1979 Editions
  • ASCE Manual No. 52 for Steel Transmission Towers, 1st & 2nd Editions
  • ASCE/SEI 48-05 for Steel Pole Structures
  • API (LRFD & WSD-20)
  • API RP 2A-WSD 21st Edition

Other Steel Design Codes

  • Eurocode 3 (EC3) 2005 Edition
  • ISO 19902:2007(E)
  • NPD (Norwegian OPD)
  • British BS5950 2001 Edition
  • BS5950 (British LSD)
  • BS449 (British ASD)
  • CAN97 (Canadian)
  • Indian Standard IS800 2007 (Third Edition)
Base Plate Analysis


The dase plate wizard (BPW) is a graphics-based tool that helps you create models of base plates anchored to bearing surfaces with one or more attachments.

Base plate analysis models consist of the following:

  • Plate
  • Holes
  • Notches
  • Tabs
  • Attachments
  • Anchors
  • Stiffeners
  • Bearing surface data
  • Boundary conditions representing shear lugs
  • Edge welds
  • Other relevant data


  • Plate dimensions, notches, holes, and skewed edges
  • Finite element mesh size
  • Attachment location and rotation (up to 25 attachments per plate), including:
    • AISC wide flanges, tubes, pipes, channels, tees, and angles
    • User-defined shapes
    • Attachments may be rotated in-plane
    • Attachments may be modeled as an in-plane rigid solid or as a FE mesh extension
  • Anchor location and properties
  • Anchors (up to 1,000) may be modeled as linear or nonlinear springs or as frame members, including tension-only members
  • Bearing surface properties
  • Bearing surface stiffness may be specified as Fc’, E, or F/L**3
  • Gaps between the plate and bearing surface
  • Stiffeners may be rectangular, trapezoidal, or triangular
  • Modeling constraints not set by the bearing surface or anchors and loadings
  • Constraints allow extra boundary conditions at specified node locations
  • Cutouts enable modeling of tabs, holes, notches, and skewed plates
  • Base plate models made be saved and recovered using .gtbp format
  • Results (anchor forces, bearing surface pressure, plate stresses, and displacements) may be reviewed in the BPW
CIS/2 File Capabilities


GT STRUDL includes a bi-directional CIS/2 interface to Intergraph Smart™ 3D. Engineers can take advantage of the extensive modeling features of Smart 3D and the powerful structural analysis and design capabilities of GT STRUDL. Other programs that use the CIS/2 model data format can be interfaced to GT STRUDL.

Import of CIS/2 Files

GT STRUDL can read the following information from a CIS/2 analysis model data file:

  • Joint/node location
  • Joint/node support condition and release status
  • Member (beam element) incidences
  • Member profile and cardinal point
  • Member beta angle
  • Member end releases (pinned connections)
  • Member eccentricities
  • Load cases
  • Applied joint loads
  • Applied member loads (concentrated/distributed, local/global)
  • Load combinations
  • “Assembly maps” detailing which analytical members compose a single physical member

Export CIS/2 Files

GT STRUDL can create a CIS/2 of your data file analysis model containing all the data listed for import, plus these analysis results:

  • Support reactions
  • Joint/node displacements
  • Member end forces

When exporting a CIS/2 analysis model, the user can select:

  • Units (length and force)
  • Whether to include applied loads or results
  • Default steel grade
  • Assumed member type (beam, column, or brace)
  • Whether to convert from a global Y-vertical axis to a Z-vertical axis
  • An option to write analysis elements as physical elements
Reinforced Concrete Design


With GT STRUDL, engineers can design concrete beams, columns, one-way slabs, shear walls, and two-way flat plate and flat slab structures per ACI 318. GT STRUDL also provides detailed quantity take-offs based on design results. A great deal of engineering time can be saved with this capability.

GT STRUDL also provides details of reinforcing bar lengths and arrangement details per user-controlled specifications, as well as beam-to-column joint details.

Concrete Component Design

  • Beams
  • Columns
  • One-way slabs
  • Shear walls
  • Two-way flat slabs

Automatic Generation

  • Building geometry
  • Special members
  • Floor slabs
  • Wall panels
  • Uniform floor loads
  • Wind loads

Design Output

  • Cross-section dimensions
  • Required area of steel
  • Number and sizes of bars
  • Placement of bars
  • Spacing and cut-off points
  • Stirrup/link sizes and spacing
  • Critical design moments and shear for verification
  • Number, size, and spacing of ties/spirals (for columns)

Special Features

  • Detailed material take-off
  • Beam-to-column joint details
  • Seismic design and detailing
  • User-specified design values
  • Concrete girder definition
  • P-Delta analysis
Offshore Analysis & Design


GT STRUDL offers powerful capabilities for offshore analysis and design. A set of integrated features enable the engineer to perform the complex functions of sea environmental load computation, fatigue life analysis, jacket pile foundation analysis, and code checking of offshore structural strength and performance behavior.


The computation of sea environmental loads is performed by the GTSELOS program. Various specialized analyses include the following:

  • Static and dynamic wave and wind load analyses of fixed and floating jacket and semi-submersible structures
  • Jacket launch analysis, including the effects of both barge and jacket motion
  • Jacket upending analysis
  • Jacket floating stability analysis

The sea environment loads computed by GTSELOS are then easily imported by GTSTRUDL, where they are used to perform fatigue life analysis, jacket pile foundation analysis, and code-checking procedures.

Fatigue Life Analysis

Fatigue life analysis can be performed by one or more of three methods, including the Discrete Probabilistic Method, the Power Spectral Density Method, and the simple Deterministic Method. The fatigue life analysis includes load-dependent joint classification analysis according to:

  • API and ISO standards
  • SCF factor computations based on the Kuang, Smedley, and Efthymiou equations
  • User-defined S-N fatigue data
  • Cumulative damage computation based on the appropriate application of the Palmgren-Miner Law

Pile-Structure Interaction Analysis

Pile-structure interaction analysis can be used for three-dimensional structures supported by nonlinear foundation pile members that are embedded in a nonlinear soil medium. The superstructure is described by a conventional GT STRUDL small deflection, linear elastic model. The pile-soil foundation can be modeled to include the:

  • Soil nonlinear bending, axial, and torsional properties
  • Inelastic load displacement properties of the pile
  • Beam-column effect of the pile
  • Ultimate axial capacity of the pile, taking into account skin friction along the pile

Code Checking

Standard tubular members can be checked according to the provisions of the latest API and ISO code provisions for:

  • Tension
  • Compression
  • Bending
  • Punching shear between brace and chord members
  • Hydrostatic collapse
Quality Assurance

GTS_Nuclear QA Graphic

Since 1983, the GT STRUDL quality assurance and quality control (QA/QC) program and procedures have been some of the industry’s most rigorous. They are in full compliance with applicable provisions of the U.S. NRC’s 10CFR21 and 10CFR50 Appendix B regulations. In addition, GT STRUDL QAQC procedures are in full conformance to the ASME NQA-1-2008, including the 2009 Addenda Subpart 2.7 (NQA-1a-2009).

Comprehensive QA/QC Program

The QA/QC program and procedures are routinely audited by independent auditors from nuclear industry corporate licensees several times each year. Auditors representing the Nuclear Procurement Issues Committee (NUPIC) and the Nuclear Industry Assessment Committee (NIAC) conduct audits every three years. Each new version of GT STRUDL is thoroughly validated and verified (V&V) for its computational quality and performance with approximately 5,000 V&V test problems.

The combination of GT STRUDL's QA/QC procedures along with its advanced linear and nonlinear analysis capabilities, computational speed, steel and reinforced concrete design, extensive collection of comprehensive detailed user documentation, and technical support services makes GT STRUDL ideal for use in the worldwide process, power, marine, and other general structural engineering industries.

GT STRUDL Structural Analysis and Design Modeling

GT STRUDL is one of the most widely used, fully integrated, and adaptable structural analysis solutions in the world. Get the brochure!

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Intergraph® GT STRUDL®
TUF Group GT STRUDL offers powerful structural analysis and design modeling software.


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