# Computers and Structures, Inc.

> Computers and Structures, Inc. (CSI) is a Walnut Creek, California software company founded in 1975 that builds the analysis and design tools structural and earthquake engineers use to model buildings, bridges, dams, stadiums and towers. Its finite-element products - SAP2000, ETABS, CSiBridge, SAFE, PERFORM-3D and CSiCOL - are used by engineers in more than 160 countries and have helped shape landmark structures including the Burj Khalifa, Taipei 101 and One World Trade Center. Founded and still led by structural engineer Ashraf Habibullah, CSI grew out of the SAP and ETABS research programs developed at UC Berkeley.

- **Founded:** 1975
- **Headquarters:** Walnut Creek, California, United States
- **Founders:** Ashraf Habibullah (Founder, President & CEO), Edward L. Wilson (Co-creator of the SAP/ETABS technology (UC Berkeley professor))
- **Team size:** ~230 employees
- **Products:** ETABS, SAP2000, CSiBridge, SAFE, PERFORM-3D
- **Notable:** ETABS produced the structural math model for the Burj Khalifa, the world's tallest building., Software used on Taipei 101, One World Trade Center and the Beijing 'Bird's Nest' Olympic Stadium., Products used by engineers in more than 160 countries.

## Products & services

- **ETABS** — Integrated analysis and design software for multi-story buildings; used to model the Burj Khalifa. Latest v23 adds ACI 318-25 design and ASCE 41-23 nonlinear hinges.
- **SAP2000** — General-purpose 3D structural analysis and design for civil structures - dams, towers, stadiums, industrial and transportation structures. First released 1996; v27 expands meshing.
- **CSiBridge** — Modeling, analysis and design of concrete and steel bridge systems.
- **SAFE** — Design of concrete floor slabs and foundation systems.
- **PERFORM-3D** — Nonlinear analysis and performance-based seismic design of structures.
- **CSiCOL** — Analysis and design of columns of any cross-section.

## Achievements

- ETABS produced the structural math model for the Burj Khalifa, the world's tallest building.
- Software used on Taipei 101, One World Trade Center and the Beijing 'Bird's Nest' Olympic Stadium.
- Products used by engineers in more than 160 countries.
- Founder Ashraf Habibullah elected to the U.S. National Academy of Engineering in 2024.
- SAP2000/ETABS recognized among the top seismic engineering products of the 20th century (ATC-ENR).
- Nearly 50 years of continuous R&D since 1975.

## Latest updates

- **2025-10** — Released ETABS v23.0.0 with ACI 318-25 design, ASCE 41-23 automatic nonlinear hinges, FEM buckling analysis and NBCC 2025 loading.
- **2025-01** — Added BIM data exchange between Autodesk Revit 2025 and SAP2000, ETABS and SAFE.
- **2024-01** — Founder Ashraf Habibullah elected to the National Academy of Engineering.

## Links

- Website: https://csiamerica.com
- LinkedIn: http://www.linkedin.com/company/csiamerica
- Twitter/X: https://twitter.com/CSiAmericaSoft
- YouTube: https://www.youtube.com/user/CSIAmericaSoftware
- Instagram: https://www.instagram.com/csiamerica/
- Facebook: https://www.facebook.com/computersandstructures

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Last updated: 2026-07-15