Add beam section logic

StructureHelperLogics/Models/BeamShears/StirrupEffectiveness.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperLogics.Models.BeamShears
+{
+    /// <inheritdoc/>
+    public class StirrupEffectiveness : IStirrupEffectiveness
+    {
+        /// <inheritdoc/>
+        public double MaxCrackLengthRatio { get; set; }
+        /// <inheritdoc/>
+        public double StirrupShapeFactor { get; set; }
+        /// <inheritdoc/>
+        public double StirrupPlacementFactor { get; set; }
+    }
+}