> 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/superstructure-code-check-sig/diaphragm-code-check-aashto-sig.md).

# Diaphragm Code Check (AASHTO) \[SIG]

The diaphragm code check takes into account axial force, bending, and shear. If the objective is to solely verify axial force, the cross frame code check object should be utilized.

**Diaphragm:** Diaphragm for code check

**Code Check Template:** The code check template is utilized to extract global parameters, results from finite element analysis, and limit states employed in the design process.

**Station Offset of Section from Center:** The code check station is measured from the center, where positive values indicate the right side when looking upstream along the PGL.

**Panel Type \[InteriorPanel/EndPanel]:** The terms "end panel" and "interior panel" are used to describe the sections of a steel girder plate that are positioned at the ends and interior sections of the girder, respectively, as depicted in the accompanying figure. The interior panels comprise the remaining segments of the girder that lie between the end panels.

**Bridge Alignment Type \[Straight Bridge/Curved Bridge]:** This parameter defines the bridge type.

**PDF Name (Export):** This parameter allows the name of the code check document to be modified when saving it as a PDF. When renaming the file, special attention must be given to the text characters on the [linked](https://docs.openbrim.org/faq/general/faq-illegal-chars) page, as certain characters may interfere with parametric equations and lead to unexpected results.

![](https://openbrim.atlassian.net/wiki/download/attachments/2186051592/image-20230307-193138.png?api=v2)

## Stiffener

**Has Long. Stiffener \[NO/YES]:** Select "Yes" if there is a longitudinal stiffener that passes through the diaphragm code check station.

**Long. Stiff- Comp. Flange:** The distance from the compression flange to the longitudinal stiffener. This value is used in web buckling calculations per AASHTO 6.10.1.9.

**Has Trans. Stiffener \[NO/YES]:** Select "Yes" if the diaphragm code check station is located between two transverse stiffeners.

**Transverse Stiffener Spacing:** The spacing between the transverse stiffeners, as shown in the illustration below.

![](https://openbrim.atlassian.net/wiki/download/attachments/2186051592/image-20230307-203735.png?api=v2)


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