Question
During the construction stage analysis of a composite section, the reaction to self-weight appears to be incorrect.
Answer
If the materials of Part 1 and Part 2 are different in a composite section during the construction stage definition, the 'Material Type' should be defined as 'Material' instead of 'Element'.
1. Composite section for Construction Stage
1) If the cross-section properties are calculated from SPC, and the material type is not defined as 'Material' in the 'Composite section for Construction Stage' in midas Civil, the material information for each part will not be entered. This will result in differences between the calculated cross-section properties from SPC and the results obtained from the midas Civil.
2) In the midas Civil solver, the conversion of cross-sectional area based on the base material defined in SPC is not adjusted by a factor. Instead, the actual cross-sectional properties of each Part are calculated based on the material ratios.
3) During the construction stage analysis, the section stiffness scale factor / Part stiffness scale factor does not reflect all factors, but only factors related to Asy, Asz, and Ixx. (These are the only factors that are modified at the pre-processing stage and entered into the software.)
2. Construction Sequence
1) If the materials of Part 1 and Part 2 are different in a composite section during the construction stage definition, the 'Material Type' should be defined as 'Material' instead of 'Element'. If it is defined as 'Element', Part 1 and Part 2 will be applied as 'Base Material' which is defined in SPC.
2) When defining the construction stages of a composite section, inactivating the self-weight is not supported in any case.