What AASHTO refers to as “Steel Girder Structures” implies composite as \(t\) is stated as the depth of the concrete deck.
| Symbol | Description |
|---|---|
| \(H\) | Depth of superstructure |
For composite sections:
\[ A = 12'' \]
For concrete sections:
\[ A = max(16'' - H, 12'') \]
\[\begin{align} \frac{t - 0''}{4'' - 0''} & = \frac{T_{seg1} - T_{1}}{T_{2} - T_{1}} \\ T_{seg1} & = \frac{t}{4''}(T_{2} - T_{1}) + T_{1} \end{align}\]
\[\begin{align} \frac{t - 4''}{A + 4'' - 4''} & = \frac{T_{seg2} - T_{2}}{0 - T_{2}} \\ \bigg(\frac{t - 4''}{A}\bigg)(-T_{2}) + T_{2} & = T_{seg2} \\ T_{seg2} & = T_{2}\bigg(1 - \frac{t - 4''}{A}\bigg) \end{align}\]
\[ T_{4} = max(T_{seg1}, T_{seg2}, 0) \]
