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OpenSees is a software framework published by OpenSees for developing applications that simulate the performance of structural and geotechnical systems subjected to earthquakes. The framework falls within the engineering and scientific simulation software category, with a particular focus on earthquake engineering and seismic analysis. Rather than functioning as a single fixed application, OpenSees serves as an underlying framework upon which simulation applications can be built, enabling users to model and evaluate how structures and geotechnical systems respond when subjected to earthquake loading. Its purpose centers on supporting the development of tools for simulating the seismic performance of structural systems, such as buildings and other constructed facilities, as well as geotechnical systems, such as soil and foundation environments affected by ground motion. Use cases for OpenSees therefore span both structural engineering and geotechnical engineering contexts, wherever the assessment of system performance under earthquake conditions is required. Researchers, engineers, and developers working in the field of earthquake engineering can employ the framework as a basis for constructing simulation applications tailored to the behavior of structural and geotechnical systems during seismic events. The current version of OpenSees cataloged here is version 3.8.0, and one version of the software is represented in this catalog entry. As a framework dedicated to the simulation of structural and geotechnical performance under earthquakes, OpenSees occupies a specialized position within engineering software, addressing the specific need for simulation-based evaluation of seismic performance across both structural and geotechnical domains.
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