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Results which are reported for the individual stages of a staged-construction [load case|kb:Load case] are cumulative. For example, Stage 2 results contain contribution from both Stage 1 and Stage 2.

To obtain response from load applied only during a particular stage, either of the following two methods are available:

* Post-process [SAP2000|sap2000:home] output. To obtain results for Stage _n_, for example, subtract Stage _n-1_ results from those of Stage _n_.

* Redefine the single staged-construction load case as a chained sequence of load cases, each using stiffness at the end of the previous case. Next, define a [load combination|kb:Load combination] which collects results only for a given Stage _n_ as follows:
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Stage _n_ results = (cumulative Stage _n_ results) - (cumulative Stage _n-1_ results)


h1. Example

To demonstrate this second method, a point load is applied to the free end of a horizontal cantilever, as shown in Figure 1:

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!fig 2 - geometry.png|align=center,border=0!

{center-text}Figure 1 - Horizontal cantilever{center-text}

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A [staged-construction|kb:Staged construction] load case (STAGED) is defined, then incremental loads of 1kN, 10kN, and 100kN are applied in Stages 1, 2, and 3, as shown in Figure 2:

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!fig 3 - staged construction load case.png|align=center,border=1!

{center-text}Figure 2 - Staged-construction load case{center-text}

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Noncumulative results are then obtained for Stages 2 and 3 by defining staged-construction load cases which have only single stages. These [load cases|kb:Load case] (named STAGED stage 1, STAGED stage 2, and STAGED stage 3) are equivalent to the original STAGED case except that loading is represented by a chained sequence of individual load cases. Next, [load combinations|kb:Load combination] (named stage 1 only, stage 2 only, and stage 3 only) are defined in a similar manner. Once analysis is run, results are obtained for individual stages, as shown in Figure 3:

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!fig 1 - joint deflections.png|align=center,border=0!

{center-text}Figure 3 - Individual stage results{center-text}


h1. Attachments

* [SAP2000 V14.2.4 model |Obtain results for individual stages of a staged-construction load case^cantilever model V14.2.4.zip] (zipped SDB file)