说明：  最新版本的OpenSees，基于tcl语言编写。OpenSees是分析模拟地震作用下结构和岩土系统响应的一个软件框架。太平洋地震工程研究中心已经将其发展成为，为 基于性能 地震分析研究服务的计算平台。2004年以来，OpenSees已经成为NEESit 模拟组件的一部分。
(The latest version of Opensees，based on tcl language.The Open System for Earthquake Engineering Simulation (OpenSees) is a software framework for simulating the seismic response of structural and geotechnical systems. OpenSees has been developed as the computational platform for research in performance-based earthquake engineering at thePacific Earthquake Engineering Research Center. OpenSees is also the simulation component for the NEESit since 2004.)