![Concrete Diaphragm in-plane Shear Design Based on ACI 318-08 1 Concrete Diaphragm in plane Shear Design Based on ACI 318 08](https://excel.civilmdc.com/wp-content/uploads/2021/12/Concrete-Diaphragm-in-plane-Shear-Design-Based-on-ACI-318-08.png)
In structural engineering, a diaphragm is a structural element that transmits lateral loads to the vertical resisting elements of a structure (such as shear walls or frames). Diaphragms are typically horizontal, but can be sloped such as in a gable roof on a wood structure or concrete ramp in a parking garage.