Which part of a channel beam bridge is primarily considered as the stem?

In a channel beam bridge, the stem refers to the vertical or web portion of the channel beam configuration. The channel beam, characterized by its 'C' or 'U' shape, has a horizontal flange at the top and bottom and a vertical web in between that provides support and stability. This web or vertical portion is crucial as it resists shear forces and contributes to the overall structural integrity of the bridge.

The other components, such as bolted connections, decking material, and diaphragm reinforcement, serve important roles within the bridge system but do not constitute the stem itself. Bolted connections primarily join different structural elements together, while decking material offers the surface for vehicles and pedestrians. Diaphragm reinforcement provides support and helps to distribute loads across the bridge spans but does not represent the vertical web portion of the channel beam. Understanding the specific role of the stem within the channel beam helps clarify its significance in bridge design and safety assessments.