It defines an envelope of Analysis Case objects or Combination objects which can be used for post-processing. For example, the user can specify Combination objects that will be used for member analysis or design.
<O T="Combination" Envelope="1" >
<O T="CombinationItem">
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</O>
<O T="CombinationItem">
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</O>
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</O>
Using Envelope for AnalysisCase objects.
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<O N="WS1" D="Wind load on structure (normal)" T="AnalysisCase" />
<O N="WS2" D="Wind load on structure (parallel)" T="AnalysisCase" />
<O N="DC" D="Dead load of structural components" T="Analysis Case" />
<O N="DW" D="Dead load of wearing surfaces and utilities" T="AnalysisCase" />
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<O N="WS" T="Combination" Envelope="1">
<O T="CombinationItem" Case="@WS1|AnalysisCase" >
<O T="CombinationItem" Case="@WS2|AnalysisCase" >
</O>
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<O N="Strength III" T="Combination" >
<O T="CombinationItem" Case="@WS|Combination" Factor="1.40">
<O T="CombinationItem" Case="@DC|AnalysisCase" Factor="1.25">
<O T="CombinationItem" Case="@DW|AnalysisCase" Factor="1.25">
</O>
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Using Envelope for Combination objects.
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<O N="Strength I" T="Combination" >
<O T="CombinationItem" Case="@DC|AnalysisCase" Factor="1.25">
<O T="CombinationItem" Case="@DW|AnalysisCase" Factor="1.25">
</O>
<O N="Strength III" T="Combination" >
<O T="CombinationItem" Case="@WS|Combination" Factor="1.40">
<O T="CombinationItem" Case="@DC|AnalysisCase" Factor="1.25">
<O T="CombinationItem" Case="@DW|AnalysisCase" Factor="1.25">
</O>
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<O N="Strength" T="Combination" Envelope="1">
<O T="CombinationItem" Case="@Strength I|Combination" >
<O T="CombinationItem" Case="@Strength III|Combination" >
</O>
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