ConcreteBucklingCalculator was added

StructureHelperLogics/NdmCalculations/Buckling/ConstPhiLLogic.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperLogics.NdmCalculations.Buckling
+{
+    internal class ConstPhiLLogic : IConcretePhiLLogic
+    {
+        public double GetPhil()
+        {
+            return 2.0d;
+        }
+    }
+}