Add beam shear window

StructureHelperCommon/Models/Materials/IMaterialStrengthByLibMaterial.cs

@@ -0,0 +1,14 @@
+using StructureHelperCommon.Infrastructures.Interfaces;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperCommon.Models.Materials
+{
+    public interface IMaterialStrengthByLibMaterial : ISaveable, ICloneable, IMaterialStrength
+    {
+        ILibMaterial LibMaterial { get; }
+    }
+}