| name = 2-span girder simply supported to DL and continuous for LL

 |
| description = 2-span girder simply supported to DL and continuous for LL

 |
| keyword = staged construction

 |
| program = SAP2000

 |
| version = V12.0.1

 |
| status = in progress

 |
| id = ok/staged construction - frame releases (simply supported for dl, continuous for ll)}}

 |

h1. Overview

This simple two span model simulates a structure that is simply supported for dead loads and continuous for live load. A [staged construction|kb:staged construction] [load case|kb:load case] with 5 stages was defined as follows to simulate this condition:

* Stage 1: Add 2 frame elements, one element for each span.
* Stage 2: Assign moment end releases to start joint of the frame element representing the second span. (the frame end releases must be first defined via "Define > Named Property Sets > Frame Releases"; see [staged construction tips|migration1d:Staged construction-Tips] and [staged construction operations|migration1d:Staged construction-operations])
* Stage 3: Apply loads, the response will be as for a simply supported structure.
* Stage 4: Fix the moment end releases applied in Stage 2.
* Stage 5: Apply loads, the response for these additional loads will be as for a continuous structure.

h1. Model Screenshot

!2-span_girder_simply_supported_for_DL_and_continuous_for_LL.png!

h1. Attachments

* [SAP2000 V12.0.1 model|^SAP2000 V12.0.1 model.zip] (Zipped SDB file, 5 kB)