Long Term Composite Section (Negative Moment Region)

Question:

 The longitudinal reinforcement area is being divided by 3, but the I believe that the reinforcement will not creep over time and therefore should not be divided by 3. I've attached an Excel Output table. Please explain?

Answer:

If you follow the FHWA Examples for Steel Bridge Design Handbook, it is clearly mentioned in there that

(Reference: Design Example 3: 3-Span Continuous Horizontally Curved Composite Steel-I-Girder Bridge Page 45-48)