CSI ETABS 23.3.0 for Windows is a professional structural analysis and building-design software platform developed by Computers and Structures, Inc. (CSI). It is designed for structural engineers, civil engineers, consultants, and building-design professionals who need to model, analyze, design, and document multi-story buildings and complex structural systems. ETABS provides an integrated environment covering structural modeling, finite-element analysis, steel and concrete design, load definition, seismic and wind analysis, and engineering reporting.

The software provides tools for creating complete building models using columns, beams, slabs, walls, diaphragms, braces, foundations, links, springs, and other structural components. Engineers can define materials, section properties, load patterns, load combinations, mass sources, diaphragms, and construction stages before performing linear or nonlinear structural analysis. The SAPFire Analysis Engine provides multi-core processing and supports both eigenvalue and Ritz-vector analysis.

ETABS supports design of steel frames, reinforced-concrete frames, concrete slabs, concrete shear walls, composite beams and columns, steel joists, and other building components using a wide range of international design standards. ETABS 23.3.0 adds concrete and post-tensioned slab design according to CSA A23.3:2024, as well as automated wind loading according to KDS 41 12 00:2022 with automated Gust-factor calculations and optional cross-wind and torsional effects.

ETABS 23.3.0 also expands structural-analysis data management and interoperability. Database tables can be exported to SQLite, a new Story Inertial Forces output table provides inertial forces at individual story levels, and API support has been added for clients targeting .NET 10 through COM. The platform also provides BIM interoperability and integration with other CSI applications for broader structural-engineering workflows.

Key Features

• Integrated building modeling, analysis, design, and reporting

• 3D structural modeling for multi-story buildings

• Steel and reinforced-concrete frame design

• Concrete slab and post-tensioned slab design

• Concrete shear-wall design

• Composite beam and composite column design

• Steel joist design

• Finite-element analysis

• Linear and nonlinear structural analysis

• Static, modal, response-spectrum, and time-history analysis

• Eigenvalue and Ritz-vector analysis

• SAPFire multi-core analysis engine

• Wind and seismic load generation

• Automated wind loading according to supported international codes

• KDS 41 12 00:2022 automated wind loading

• Automated Gust-factor calculation

• Optional cross-wind and torsional wind effects

• CSA A23.3:2024 concrete and PT slab design

• ACI 318-25 design support

• CSA A23.3 shear-wall design

• Eurocode and other international design standards

• FEM-based steel buckling analysis through BucklingFEM

• Interactive database editing

• SQLite database-table export

• Story Inertial Forces output tables

• Section cuts and detailed force extraction

• Load cases, combinations, patterns, and mass sources

• Construction-stage analysis

• P-Delta and nonlinear analysis capabilities

• Detailed graphical results and force diagrams

• Automated design checks and detailed design results

• API support for automation and external applications

• .NET API integration

• BIM interoperability with compatible CSI workflows

• Integration with SAFE and other CSI structural-analysis products

What’s New

ETABS 23.3.0

• Added concrete and post-tensioned slab design according to CSA A23.3:2024

• Added automated wind loading according to KDS 41 12 00:2022

• Added automated Gust-factor calculations for rigid and flexible structures based on the governing mode shape

• Added optional cross-wind and torsional wind effects where applicable

• Added a new Story Inertial Forces output table for modal and response-spectrum load cases

• Improved loading calculations during analysis-element model generation

• Added database-table export to SQLite format

• Added API support for clients targeting .NET 10 through COM

• Updated Section Cut behavior for auto-meshed area objects and associated internal elements

• Load cases and combinations are now alphabetically sorted in applicable list boxes

ETABS 23 product-family improvements

• ETABS 23.0 introduced FEM-based steel buckling analysis through the integrated BucklingFEM plugin for Ultimate-level licenses

• ACI 318-25 concrete frame, shear-wall, and slab design capabilities were introduced in the ETABS 23 release family

• CSA A23.3-24/19 shear-wall design was added

• SAFE-model import into ETABS can be performed at a selected story with options for merging geometry, properties, and loads

• Cloud sign-in licensing was improved, including remote checkout for certain offline or air-gapped environments

Professional Applications

• High-rise building structural design

• Commercial building analysis

• Residential and apartment buildings

• Industrial structures

• Office buildings

• Hospitals and institutional buildings

• Hotels and mixed-use developments

• Parking structures

• Reinforced-concrete building design

• Steel-frame building design

• Seismic analysis and design

• Wind-load analysis

• Structural stability and buckling studies

• Post-tensioned slab design

• Structural consulting and engineering verification

• Building-code compliance

• BIM and multidisciplinary engineering workflows

System Requirements

Minimum Requirements

• OS: Windows 10 or Windows 11, 64-bit. ETABS requires a 64-bit CPU and 64-bit Windows operating system.
• CPU: 64-bit Intel or AMD processor
• RAM: 16 GB minimum
• Storage: 6 GB for software installation, with additional space required for models and analysis results
• GPU: Graphics hardware supporting 1920 × 1080 resolution and 16-bit color; at least 1 GB VRAM for graphics
• Display: 1920 × 1080 or higher
• DirectX: DirectX-compatible graphics hardware for accelerated graphics mode
• Internet: Required where applicable for cloud licensing, activation, updates, and online services