SERM Bridge Reference - Finding coefs

[rudd333]

In the SERM there are several references to Moments Shears and Reactions For Continuous Highway Bridges. These references don't explain where the coefficients and formulas are coming from and I am having trouble locating them. 

On the attached PDF I think I was able to locate the gamma factor for example 8.16 in Table A4.0 of the mentioned reference above. Mmax is coefficient is at the center of span 1 and Md coefficient is at the very bottom listed as "total area".

However, in Example 8.2, the same formula is used but with "a" as the coefficient (M=awL^2). This example is referring to lane loads only and I'm unable to find where that is pulled from.

This feels like such an easy yet crucial step in calculating moments/shear for bridges so if anyone can shed some light on these formulas or give any tips on the reference I would greatly appreciate it. I'm a buildings guy so AASHTO and anything related are foreign territory.

View attachment Bridge_forum post.pdf

 

[BamaStrucPESE]

If you google  Moments Shears and Reactions For Continuous Highway Bridges , you can find a copy of that reference and read through some of their examples. I did this and it was very helpful in understanding what they were talking about.

 

[ZEZO4]

I got the same problem, but I don't think we need it because the bridges questions only in the mornings so I think they will concern about specific other requirements than this which is considered as analysis,  it I agree whith you I got difficult to find out the factors values for the moment, shear and even the influence line.