General
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This page is devoted to frequently asked questions (FAQ) related to staged construction. |
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What is the difference between Load Objects and Load Objects if Added?
Extended Question: On the Load Case Data for Construction Stage Analysis form, what is the difference between Load Objects and Load Objects
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if Added?
"Answer: Load Objects " will load apply the specified loading to all objects in the specified group using the specified load, regardless of whether or not they were added in the current stage. " Load Objects If if Added " will only load only the objects which are in the specified group that and were added in the current stage.
Why
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See Staged Construction Operations
How can I extract creep, shinkage and secondary prestress effect, respectively from the staged-construction analysis result?
For statically indeterminate structures, this is not possible since the shrinkage strains can cause stresses that affect the creep so they ca not be separated (unless the effect of shrinkage on creep is neglected).
For statically determinate structures, the procedure is not automated, but you could do some post-processing of SAP2000 results to obtain an estimate of these forces. For example, you could analyze the response with creep and without the creep and then the estimate effects of creep from the difference between the two responses.
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do shear and bending stresses disappear after changing staged-construction section properties?
Answer: For response, please see the Staged-construction operations article.
How are creep, shrinkage, and secondary prestress effects extracted from staged-construction results?
How is design done for the individual stages of a staged-construction load case?
Extended Question: I need to do a code check for the steel members for within a certain step in of a staged-construction load case. The code checker uses a design load combination for checking. I do not seem to be able to Is it possible to define a load combination that which includes the results of a certain step from a staged construction load case. Can this be done-construction step?
Answer: You could replace each Each stage ( or sequence of stages ) for which you need to perform the design design must be performed may be replaced by a standalone staged-construction load case that would be using which uses stiffness at the end of a the load case for the previous stage. Then the The design load combination can may then be created for these new load cases that essentially which represent the individual stages in the construction stage analysisof staged-construction analysis.
How are results obtained only for a certain stage of a staged-construction load case?
Extended Question: For each stage, staged-construction results are cumulative, meaning they incorporate response from all previous stages. Without manually post-processing output, how are results obtained for any given stage?
Answer: The staged-construction load case may be replaced by a chained sequence of stage-construction load cases, each using stiffness at the end of the previous load case. Results for a single stage could then be obtained by creating a load combination which includes the current load case with a scale factor of 1, and the previous load case with a scale factor of -1.
For additional details and a sample model, please see the Obtain results for individual stages of a staged-construction load case tutorial.