Window of calcultion's property is added

StructureHelperLogics/Models/Calculations/CalculationProperties/ForceCombination.cs

@@ -0,0 +1,19 @@
+using LoaderCalculator.Data.Matrix;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace StructureHelperLogics.Models.Calculations.CalculationProperties
+{
+    public class ForceCombination : IForceCombination
+    {
+        public IForceMatrix ForceMatrix { get; private set; }
+        public bool TakeInCalculate { get; set; }
+
+        public ForceCombination()
+        {
+            ForceMatrix = new ForceMatrix() { Mx = 0d, My = 0d, Nz = 0d};
+            TakeInCalculate = true;
+        }
+    }
+}