介绍了二维图形数据的线性四叉树编码数据结构。
The data structure of linear quadtree coding for two-dimension graphic data is presented.
根据模型试验和二维、三维非线性分析结果，提出了新的拱坝孔口结构配筋公式。
A new formula for the calculation of reinforcing bars of the orifice is proposed, based on experimental and two and three dimensional analysis.
从简单的二维框架静力分析到复杂的三维非线性动力分析，SAP2000能为所有结构分析和设计提供了解决方案。
From a simple small 2d static frame analysis to a large complex 3d nonlinear dynamic analysis, SAP2000 is the answer to all structural analysis and design needs.
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