第二节  桁架结构基本信息录入与保存

此节之后会结合一个算例。结构如图，EA = 300000 kN

杆件编号、节点编号、坐标系：

2.1  文本信息

bars.txt

1,1,3,300000
2,2,3,300000
3,4,3,300000
4,2,4,300000

nodes.txt

1,0,3,1,1,0,0
2,0,0,1,1,0,0
3,4,3,0,0,0,-20
4,4,0,0,0,30,0

2.2  静态类 ClassBasicInfo 存放基本结构数据

新建类库，命名为 Business，添加对 PlaceUsingTxt.dll 的引用，新建类，命名为 ClassBasicInfo，贴入以下代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;namespace Business
{public static class ClassBasicInfo{public static int[,] BarsNodes;//杆件节点编号public static Single[] LinearStiffness;//杆件刚度public static Single[,] Coordinate;//节点坐标public static bool[,] Restraint;//节点约束public static Single[,] Loads;//节点荷载public static Single[,] TatalStiffnessMatrix;//总刚度矩阵public static Single[] TatalDisplacement;//总位移列阵public static Single[] TatalLoads;//总荷载列阵public static bool[] TatalRestraint;//总边界条件}
}

2.3  对静态类赋值

新建类，命名为 ClassGetBasicInfo，贴入以下代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;using PlaceUsingTxt;namespace Business
{public class ClassGetBasicInfo{public int NumBars;//杆件数public int NumNodes;//节点数public void InitBars(string StrBars){//初始化杆件信息ClassReadTxt crt = new ClassReadTxt(StrBars);string[,] tempstr = crt.OutStr2D();crt.close();//取得杆件数NumBars = tempstr.GetLength(0);ClassBasicInfo.BarsNodes = new int[NumBars, 2];ClassBasicInfo.LinearStiffness = new Single[NumBars];for (int i = 0; i < NumBars; i++){ClassBasicInfo.BarsNodes[i, 0] = Convert.ToInt32(tempstr[i, 1]);//杆件起点编号ClassBasicInfo.BarsNodes[i, 1] = Convert.ToInt32(tempstr[i, 2]);//杆件终点编号ClassBasicInfo.LinearStiffness[i] = Convert.ToSingle(tempstr[i, 3]);//杆件刚度}}public void InitNodes(string StrNodes){//初始化节点信息ClassReadTxt crt2 = new ClassReadTxt(StrNodes);string[,] temps = crt2.OutStr2D();crt2.close();//取得节点数NumNodes = temps.GetLength(0);ClassBasicInfo.Coordinate = new Single[NumNodes, 2];ClassBasicInfo.Restraint = new bool[NumNodes, 2];ClassBasicInfo.Loads = new Single[NumNodes, 2];for (int i = 0; i < NumNodes; i++){ClassBasicInfo.Coordinate[i, 0] = Convert.ToSingle(temps[i, 1]);//节点x坐标ClassBasicInfo.Coordinate[i, 1] = Convert.ToSingle(temps[i, 2]);//节点y坐标ClassBasicInfo.Restraint[i, 0] = Convert.ToBoolean(Convert.ToInt32(temps[i, 3]));//节点x方向约束ClassBasicInfo.Restraint[i, 1] = Convert.ToBoolean(Convert.ToInt32(temps[i, 4]));//节点y方向约束ClassBasicInfo.Loads[i, 0] = Convert.ToSingle(temps[i, 5]);//节点x方向荷载ClassBasicInfo.Loads[i, 1] = Convert.ToSingle(temps[i, 6]);//节点y方向荷载}}//初始化有限元法基本方程矩阵public void InitMatrix(){ClassBasicInfo.TatalStiffnessMatrix = new Single[NumNodes * 2,NumNodes * 2];//总刚度矩阵ClassBasicInfo.TatalDisplacement = new Single[NumNodes * 2];//总位移列阵ClassBasicInfo.TatalLoads = new Single[NumNodes * 2];//总荷载列阵ClassBasicInfo.TatalRestraint = new bool[NumNodes * 2];//总边界条件}//接口public void Initialize(string StrBars,string StrNodes){this.InitBars(StrBars);this.InitNodes(StrNodes);this.InitMatrix();}}
}

至此，完成基本信息的存放，以静态数组的方式储存，方便全局范围的访问。

其中，PlaceUsingTxt.dll 的源码参见：http://blog.csdn.net/silyvin/article/details/6758196