Aún no existe una función disponible para la visualización gráfica de los diagramas (en API Sap2000 hasta la versión 23). Lo que se tiene por ahora es un método que le permite obtener los resultados de las fuerzas en las estaciónes definidas en los elementos Frame para un caso de carga especifico; con estos valores podria recrear los diagramas de forma manual.
FrameForce
Syntax

SapObject.SapModel.Results.FrameForce

VB6 Procedure

Function FrameForce(ByVal Name As String, ByVal ItemTypeElm As eItemTypeElm, ByRef NumberResults As Long, ByRef Obj() As String, ByRef ObjSta() As Double, ByRef Elm() As String, ByRef ElmSta() As Double, ByRef LoadCase() As String, ByRef StepType() As String, ByRef StepNum() As Double, ByRef P() As Double, ByRef V2() As Double, ByRef V3() As Double, ByRef T() As Double, ByRef M2() As Double, ByRef M3() As Double) As Long

VBA Example

Sub GetFrameForces()
   'dimension variables
      Dim SapObject as cOAPI
      Dim SapModel As cSapModel
      Dim ret As Long
      Dim NumberResults As Long
      Dim Obj() As String
      Dim ObjSta() As Double
      Dim Elm() As String
      Dim ElmSta() As Double
      Dim LoadCase() As String
      Dim StepType() As String
      Dim StepNum() As Double
      Dim P() As Double
      Dim V2() As Double
      Dim V3() As Double
      Dim T() As Double
      Dim M2() As Double
      Dim M3() As Double
    'create Sap2000 object
      Set SapObject = CreateObject("CSI.SAP2000.API.SapObject")
    'start Sap2000 application
      SapObject.ApplicationStart
    'create SapModel object
      Set SapModel = SapObject.SapModel
    'initialize model
      ret = SapModel.InitializeNewModel
    'create model from template
      ret = SapModel.File.New2DFrame(PortalFrame, 3, 124, 3, 200)
    'run analysis
      ret = SapModel.File.Save("C:\SapAPI\x.sdb")
      ret = SapModel.Analyze.RunAnalysis
    'clear all case and combo output selections
      ret = SapModel.Results.Setup.DeselectAllCasesAndCombosForOutput
    'set case and combo output selections
      ret = SapModel.Results.Setup.SetCaseSelectedForOutput("DEAD")
    'get frame forces for line object "1"
      ret = SapModel.Results.FrameForce("1", Object, NumberResults, Obj, ObjSta, Elm, ElmSta, LoadCase, StepType, StepNum, P, V2, V3, T, M2, M3)
    'close Sap2000
      SapObject.ApplicationExit False
      Set SapModel = Nothing
      Set SapObject = Nothing
End Sub