ConcreteBucklingCalculator was added

StructureHelperLogics/NdmCalculations/Buckling/PhiLogicSP63.cs

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+using StructureHelperCommon.Models.Forces;
+using StructureHelperCommon.Models.Shapes;
+using StructureHelperCommon.Services.Forces;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperLogics.NdmCalculations.Buckling
+{
+    public class PhiLogicSP63 : IConcretePhiLLogic
+    {
+        readonly IForceTuple fullForceTuple;
+        readonly IForceTuple longForceTuple;
+        readonly IPoint2D point;
+        public PhiLogicSP63(IForceTuple fullForceTuple, IForceTuple longForceTuple, IPoint2D point)
+        {
+            this.fullForceTuple = fullForceTuple;
+            this.longForceTuple = longForceTuple;
+            this.point = point;
+        }
+
+        public double GetPhil()
+        {
+            var distance = Math.Sqrt(point.X * point.X + point.Y * point.Y);
+            var fullMoment = GetMoment(fullForceTuple, distance);
+            var longMoment = GetMoment(longForceTuple, distance);
+            if (fullMoment == 0d) { return 2d; }
+            var phi = 1 + longMoment / fullMoment;
+            phi = Math.Max(1, phi);
+            phi = Math.Min(2, phi);
+            return phi;
+        }
+
+        private double GetMoment(IForceTuple forceTuple, double distance)
+        {
+            return Math.Abs(forceTuple.Nz) * distance + Math.Abs(forceTuple.Mx) + Math.Abs(forceTuple.My);
+        }
+    }
+}