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To simulate a two-span structure which is simply supported under dead load, and continuous under live load, a [staged-construction|kb:staged construction] load case is defined with five stages, outlined as follows:

* Stage 1: Add two [frame|kb:Frame] objects, one for each span.

* Stage 2: Define frame end releases through Define > Named Property Sets > Frame Releases, then assign these moment releases to the start [joint|kb:Joint] of the second span.
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Additional information is available in the [Staged-construction tips|kb:Staged -construction tips] and [Staged-construction operations|kb:Staged-construction operations] articles.

* Stage 3: Apply load to the structure. Response will be as though the system is simply supported.

* Stage 4: Fix the moment end releases which are applied in Stage 2.

* Stage 5: Apply additional load to the structure. Response will now be as though the system is continuous.

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Structural response is presented in Figure 1:

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

{center-text}Figure 1 - Structural response{center-text}


h1. Attachments

* [SAP2000 V12.0.1 model |Two-span girder simply-supported for DL and continuous for LL^SAP2000 V12.0.1 model.zip] (zipped SDB file)