ConcreteBucklingCalculator was added

StructureHelperLogics/NdmCalculations/Buckling/IConcreteBucklingResult.cs

@@ -0,0 +1,24 @@
+using StructureHelperLogics.NdmCalculations.Analyses;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperLogics.NdmCalculations.Buckling
+{
+    /// <summary>
+    /// Results of calculation of buckling of reinforced concrete section
+    /// </summary>
+    public interface IConcreteBucklingResult : INdmResult
+    {
+        /// <summary>
+        /// Factor of increasing of bending moment (p-delta effect) in the plain XOZ
+        /// </summary>
+        double EtaFactorAlongX { get; set; }
+        /// <summary>
+        /// Factor of increasing of bending moment (p-delta effect) in the plain YOZ
+        /// </summary>
+        double EtaFactorAlongY { get; set; }
+    }
+}