> For the complete documentation index, see [llms.txt](https://docs.openbrim.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.openbrim.org/templates/steel-i-girder-bridge-workflow/construction-sig/superstructure-construction-sig/concrete-diaphragm-construction-sig.md).

# Concrete Diaphragm Construction \[SIG]

## **General**

**Pouring Stage (Weight Only):** The pouring stage of the concrete diaphragm should be specified using this parameter. Previously defined construction stages must be selected; however, one important detail to consider is that the pouring stage, where the loads of the concrete diaphragm will be applied, must occur at or after the girder erection stage. Defining the pouring stage prior to girder erection may lead to inaccurate FEA results.

**Hardening Stage (Gains Stiffness):** The hardening stage of the concrete diaphragm is when the finite element model of the diaphragm is generated and considered for FEA. A stage from the previously defined construction stages can be chosen.

**Concrete Diaphragms:** Specify the concrete diaphragms to be constructed.

**Self-Weight Factor**: The Self-Weight Factor is a parameter used to adjust the contribution of an object's own weight in structural analysis. This factor is particularly useful in simulations, as it enables the scaling or modification of the self-weight during finite element analysis (FEA).

**Noncomposite State**: Internal structure state with no stiffness contribution during pouring stage, applying full self-weight factor.

**Composite State**: Internal structure state with full stiffness during hardening stage, applying zero self-weight.


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