Why use this?

OpenSees is a software framework for simulating the dynamic response of structural and geotechnical systems. It was originally developed for performance-based earthquake engineering at the Pacific Earthquake Engineering Research Center and is now used to study structural response under fire, wind, earthquake, tsunami, and storm-surge loading.

Structural engineers choose OpenSees when they need advanced nonlinear analysis rather than a conventional linear elastic design tool. It supports fiber and distributed-plasticity elements, material and geometric nonlinearity, soil-structure interaction, reliability analysis, and scripting through Tcl and Python, making it especially powerful for research, seismic assessment, and performance-based design. [166][172][174]

Key Features

• Nonlinear structural and geotechnical finite-element analysis
• Fiber sections, distributed-plasticity elements, and advanced material models
• Static, dynamic, and response-history analysis
• Soil-structure-foundation interaction modeling
• Tcl and Python scripting, reliability analysis, and extensibility