Explain the difference between the option ‘Age’ which appears under both ‘Composite Section’ and ‘Construction Stage’.


The age factor is the age at which the element starts taking the load. This is used to calculate the creep coefficient as it depends on the "Age of Loading".

Also, the composite section for the construction stage is used to activate the girder and the slab separately for a composite section.

Now, for the composite section, we need two different age of loading for the members because when the girder start taking the load it might have a different age than when the slab start taking the load. Therefore they will have different creep coefficients that need to be taken care of in the losses and secondary effects.

So, we need to define the age of loading for the slab and girder and that can be done only by having a separate input in the "Composite Section for Construction stage". Now, as it is mentioned in the online manual as well all the inputs we provide in the Composite section for the construction stage supersede the inputs for the Construction Stage. Therefore for composite sections, for having the different creep values for slab and girder, we need to define their respective age of loadings separately.

Creation date: 8/22/2018 4:08 AM      Updated: 10/18/2023 6:48 PM
age in constructin sequnce and omposite section.docx
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