Fix max spacing of stirrups

DataAccess/DTOs/DTOEntities/BeamShearRepositoryDTO.cs

@@ -17,10 +17,14 @@ namespace DataAccess.DTOs.DTOEntities
         public List<IBeamShearSection> Sections { get; } = new();
         [JsonProperty("Stirrups")]
         public List<IStirrup> Stirrups { get; } = new();
+        public BeamShearRepositoryDTO(Guid id)
+        {
+            Id = id;
+        }
 
         public object Clone()
         {
-            throw new NotImplementedException();
+            return this;
         }
     }
 }