Influence Line for Trucks
Influence Line for Trucks
(OP)
I'm working on a work trestle for an upcoming bridge construction project. The contractor would like to back trucks with bridge beams onto the trestle for unloading. The truck/trailer/load will be +/- 140 kips on 6 axles. The trestle beams are simply supported spans. I'm trying to do this by hand, but it's quickly becoming a bookkeeping nightmare.
Is there a simple (preferably free or cheap) program that can create/analyze influence diagrams for beams?
Are there any assumptions that can be made to simplify the hand calculations? For example, is it common practice to create an influence lines at quarter points of the trestle beams rather than 1 ft increments across the beam?
Is there a simple (preferably free or cheap) program that can create/analyze influence diagrams for beams?
Are there any assumptions that can be made to simplify the hand calculations? For example, is it common practice to create an influence lines at quarter points of the trestle beams rather than 1 ft increments across the beam?






RE: Influence Line for Trucks
There's also this old publication from AISC. Not sure if it'll help you though.
https://www.aisc.org/globalassets/aisc/publication...
RE: Influence Line for Trucks
Place the wheel nearest the center of gravity at midspan and solve for moment.
RE: Influence Line for Trucks
https://newtonexcelbach.com/2013/12/03/moving-load...
Any questions, please ask.
Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/
RE: Influence Line for Trucks
RE: Influence Line for Trucks
If not, use a beam analysis software with some educated guess-and-check placement (or moving load analysis if available).
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The name is a long story -- just call me Lo.
RE: Influence Line for Trucks
Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/
RE: Influence Line for Trucks
(Also, some of my inherent bias against the "let the computer solve everything" trend is seeping in).
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The name is a long story -- just call me Lo.
RE: Influence Line for Trucks
He does if he followed the link in my first post in this thread.
Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/
RE: Influence Line for Trucks
I tried looking into AASHTO and AISC, but it seemed like the diagrams are geared toward specific loading or multispan beams. I don't deal with moving loads very much, so maybe I'm just having trouble applying them to my scenario.
Thanks IDS for the excel workbook. This looks like it is exactly what I need. Hopefully I will have some time to dive into it this morning