OpenSees源码中的钢筋类，类似于Patch中的cell类，是二维截面自动划分的基本钢筋截面类，用于计算钢筋纤维的坐标和面积。-OpenSees reinforced class source code, similar to the cell Patch class is the basic class of two-dimensional cross-section steel sectional automatic partitioning, used to calculate the