RemoveUnderlying property for primitives was added

StructureHelperCommon/Models/Forces/ForceCombinationByFactor.cs

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+using StructureHelperCommon.Infrastructures.Enums;
+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 StructureHelperCommon.Models.Forces
+{
+    /// <inheritdoc/>
+    public class ForceCombinationByFactor : IForceCombinationByFactor
+    {
+        /// <inheritdoc/>
+        public string Name { get; set; }
+        public bool SetInGravityCenter { get; set; }
+        /// <inheritdoc/>
+        public IPoint2D ForcePoint { get; private set; }
+        /// <inheritdoc/>
+        public IForceTuple FullSLSForces { get; private set; }
+        /// <inheritdoc/>
+        public double ULSFactor { get; set; }
+        /// <inheritdoc/>
+        public double LongTermFactor { get; set; }
+        public ForceCombinationByFactor()
+        {
+            Name = "New Factored Load";
+            SetInGravityCenter = true;
+            ForcePoint = new Point2D();
+            FullSLSForces = new ForceTuple();
+        }
+        public List<IDesignForceTuple> GetCombination()
+        {
+            var result = new List<IDesignForceTuple>();
+            var limitStates = new List<LimitStates>() { LimitStates.ULS, LimitStates.SLS };
+            var calcTerms = new List<CalcTerms>() { CalcTerms.ShortTerm, CalcTerms.LongTerm };
+            foreach (var limitState in limitStates)
+            {
+                var stateFactor = limitState is LimitStates.SLS ? 1d : ULSFactor; 
+                foreach (var calcTerm in calcTerms)
+                {
+                    var termFactor = calcTerm is CalcTerms.ShortTerm ? 1d : LongTermFactor;
+                    var designForceTuple = new DesignForceTuple() { LimitState = limitState, CalcTerm = calcTerm };
+                    designForceTuple.ForceTuple = ForceTupleService.MultiplyTuples(designForceTuple.ForceTuple, stateFactor * termFactor);
+                    result.Add(designForceTuple);
+                }
+            }
+            return result;
+        }
+    }
+}