Add curvature calculator DTOs

StructureHelperLogics/NdmCalculations/Analyses/Curvatures/IDeflectionFactor.cs

@@ -0,0 +1,24 @@
+using StructureHelperCommon.Infrastructures.Interfaces;
+using StructureHelperCommon.Models.Forces;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace StructureHelperLogics.NdmCalculations.Analyses.Curvatures
+{
+    /// <summary>
+    /// Implements properties for calculation deflections
+    /// </summary>
+    public interface IDeflectionFactor : ISaveable
+    {
+        /// <summary>
+        /// Factors for calculating deflections, dimensionless
+        /// </summary>
+        IForceTuple DeflectionFactors { get; set; }
+        /// <summary>
+        /// Maximum deflections, metres
+        /// </summary>
+        double SpanLength { get; set; }
+        IForceTuple MaxDeflections { get; set; }
+    }
+}