36 lines
1.1 KiB
C#
36 lines
1.1 KiB
C#
using StructureHelperCommon.Infrastructures.Exceptions;
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using StructureHelperCommon.Infrastructures.Strings;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace StructureHelperLogics.NdmCalculations.Buckling
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{
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internal class EilerCriticalForceLogic : IEilerCriticalForceLogic
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{
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public double LongForce { get; set; }
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public double StiffnessEI { get; set; }
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public double DesignLength { get; set; }
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public double GetCriticalForce()
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{
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double Ncr = - Math.Pow(Math.PI, 2) * StiffnessEI / (Math.Pow(DesignLength, 2));
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return Ncr;
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}
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public double GetEtaFactor()
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{
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if (LongForce >= 0d) return 1d;
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var Ncr = GetCriticalForce();
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if (LongForce <= Ncr)
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{
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throw new StructureHelperException(ErrorStrings.LongitudinalForceMustBeLessThanCriticalForce);
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}
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double eta = 1 / (1 - LongForce / Ncr);
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return eta;
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}
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}
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}
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