AISC Influence Line Coefficient Tables

[Nedson]

Could you please help explaining what the N = 1.27, N = 1.32 or the N values on each AISC influence line coefficient tables mean and How they can best be used for specific applications. Example a continous three span beam with the following combination: 10.68m, 12.8m and 10.67m.

Thanks in advance
Nedson

 

[bridgebuster]

Are you referring to AISC "Moments, Shear, & Reactions for Continuous Highway Bridges"? My book doesn't have N=1.27 & N=1.32.

In my version, N is a factored length using the shortest span length as N=1. Using the numbers you provided, for a three span bridge, N for the Center span is 1.2. The exterior spans have N=1, and the center span has N=1.2

 

[Nedson]

That is great bridgebuster. I just wanted that clarification, thanks for the timely salvation
Nedson

 

[bridgebuster]

You're welcome

 

[OSUCivlEng]

Does anything like this exist for frame analysis of RCBs?

 

[bridgebuster]

There's Klienlogel but it doesn't have influence lines only formulas for maximum moment and shear for dozens of loading cases.

 

[bridgebuster]

OSU: I was looking my files for something this morning and I came across "The Handbook of Frame Coefficients" circa 1947. If I have time next week I scan it.