{{Test Problem

Overview

This simple two span model simulates a structure that is simply supported for dead loads and continuous for live load. A staged construction load case with 5 stages was defined as follows to simulate this conditionTo simulate a two-span structure which is simply supported under dead load, and continuous under live load, a staged-construction load case is defined with five stages, outlined as follows:

• Stage 1: Add

  2

  two frame

  elements

  objects, one

  element

  for each span.

• Stage 2:

  Assign moment end releases to

  Define frame end releases through Define > Named Property Sets > Frame Releases, then assign these moment releases to the 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 and staged construction operations)

  
  
  Additional information is available in the Staged-construction tips and Staged-construction operations articles.

• Stage 3: Apply

  loads, the response

  load to the structure. Response will be as

  for a

  though the system is simply supported

  structure

  .

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

• Stage 5: Apply

  loads, the response for these additional loads will be as for a continuous structure.

Model Screenshot

Image Removed

See Also

• List of staged construction tutorials

Attachments

• File | filename = Staged construction

  additional load to the structure. Response will now be as though the system is continuous.

The structural response is presented in Figure 1:

Image Added

Figure 1 - Structural response

Attachments

• SAP2000 V12.0.1 model

  .zip | title = SAP2000 V12.0.1 model (Zipped SDB file, 5 kB)

  (zipped SDB file)

Metadata

• Name: Two-span girder simply-supported for DL and continuous for LL

• Description: Modeling demonstration for a two-span girder which is simply-supported for DL and continuous for LL.

• Program: SAP2000

• Program Version: 12.0.1

• Model ID: 130