??An object-oriented software framework for simulation applications in earthquake engineering using finite element methods. OpenSees is not a code.
??A communication mechanism within PEER for exchanging and building upon research accomplishments.
??As open-source software, it has the potential for a community code for earthquake engineering.
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+ The library of materials, elements and analysis commands makes OpenSees a powerful tool for numerical simulation of nonlinear structural and geotechnical systems
+ The OpenSees library of components is ever-growing and at the leading edge of numerical-simulation models
+ The OpenSees interface is based on a command-driven scripting language which enables the user to create more-versatile input files.
+ OpenSees is not a black box, making it a useful educational tool for numerical modeling
+ You can create your own material, element or analysis tools and incorporate them into OpenSees
+ NEES is supporting integration of OpenSees as the simulation component of laboratory testing
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+ linear & nonlinear structural and geotechnical models
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+ static push-over analyses
+ static reversed-cyclic analyses
+ dynamic time-series analyses
+ uniform-support excitation
+ multi-support excitation