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Overview|
Staged Construction Analysis is necessary for any construction project, especially for segmental bridges. Within one project file, all of the analyses needed for each stage of construction can be solved in one run.
Used with segmental concrete bridges, LARSA 4D's staged construction analysis stands out among its peers. The tools available in LARSA 4D simplify the complicated process of designing post-tensioned concrete box girder bridges.
Staged construction often comes hand-in-hand with Pre- and Post-tensioning Tendons and Analysis Scenarios.
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Construction Activities-
Automatic construction activities available in LARSA include:
- Construction and deconstruction of members, plates, springs, and foundation elements
- Loading
- Temporary/traveler Loads
- Support and constraint changes
- Displacement initializations
- Hoist for incremental launching
- Hinged cast, matched cast
- Tendon stressing and slackening
- Post-tension stay cables
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Time-Dependent Material Properties|
Not only does the geometry of a structure change over time, but material properties do as well. Time-dependent material properties are an integral part of LARSA's staged construction analysis.
Time-dependent material properties include concrete creep and shrinkage, steel relaxation, time effect on elastic modulus, tendon post-tensioning losses from creep, shrinkage, and superimposed loads, following the CEB-FIP '78 and '90 codes, and others. Users can also enter custom time dependent curves for particular material properties and codes
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Analysis Options-
Staged construction can include the effects of geometric and material nonlinearity, as well as time-dependent material effects, within the same analysis run.
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Cumulative and Incremental Results-
Cumulative effects can be reported separately for each load class, such as post-tensioning effects or the effects of just creep and shrinkage, which is essential for design.
Incremental effects are also available, allowing the user to see the net changes to the structure since the previous stage.
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