A More Powerful Version of the Drain-2D Computer Program

本项目旨在开展研究和进一步开发工作， 升级现有的计算机程序DRAIN 2DZ（动态响应 分析非弹性）。 该研究包括以下任务： 用P δ和失稳进行静力非线性分析 效果，开发改进的精细步骤选择技术， 调查能源平衡，损害措施和改变， 详细的动态分析，并开发交互式程序。 的 努力将导致一个升级的计划，这将成为一个有价值的 其他研究工具。 升级后的程序将有一个 有限元库超过20个元素类型，并将发布 通过国家地震信息服务处提供一般用途 工程（NISEE）。

This project is to conduct research and further development work to upgrade the existing computer program DRAIN 2DZ (Dynamic Response Analysis Inelastic). The study includes the following tasks: performing static nonlinear analysis with P delta and instability effects, developing improved fine step selection techniques, investigating energy balance, damage measures, and alterations to detailed dynamic analysis, and developing interactive procedures. The effort will result in an upgraded program which will become a valuable tool for other research studies. The upgraded program will have a finite element library of over 20 element types, and will be released for general use through the National Information Service for Earthquake Engineering (NISEE).