Fix BeamShearCalculatorLogic

StructureHelperCommon/Models/Forces/Logics/IGetForceTupleLogic.cs

@@ -0,0 +1,18 @@
+using StructureHelperCommon.Infrastructures.Enums;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperCommon.Models.Forces.Logics
+{
+    public interface IGetForceTupleLogic
+    {
+        /// <summary>
+        /// Calculates force tuple
+        /// </summary>
+        /// <returns></returns>
+        IForceTuple GetForceTuple();
+    }
+}