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P/S Bridge Girders in CONSPAN
I have designed single voided box girders for railroad loading in Conspan, although it was a few years back. Currently, I use a spreadsheet that I developed for designing prestressed railroad spans. You didn't specify what kind of railroad loading you are using. Please indicate what kind of...- purdue86
- Post #2
- Forum: Bridge engineering
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Dynamic Brakes
After the 40 series, Electro-Motive moved the dynamic brake grids away from their traditional location (at least for EMD) over the prime mover. The move allowed EMD to eliminate the dynamic brake "blister" on the 50 series locomotives. The "blister" made it easy to spot if an EMD locomotive...- purdue86
- Post #3
- Forum: Transportation engineering general discussion
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Buried steel pipe design criteria
Since this pipe is under railroad tracks, it should be designed in accordance with the American Railway Engineering and Maintenance of Way Association Manual for Railway Engineering. Part 5 of Chapter 1 covers pipelines. You should also contact the railroad that you are planning to pass under...- purdue86
- Post #3
- Forum: Structural engineering general discussion
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AREMA Steel Structures - Load Combination
And another thing... As a Bridge Engineer that has designed bridges for a class 1 railroad for over 15 years, there are a few items that I would like to pontificate on (which is appropriate for a bridge engineer based on the Latin root). Before you design a railroad structure, make sure you...- purdue86
- Post #3
- Forum: Bridge engineering
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AREMA Steel Structures - Load Combination
No AREMA does not have a formal load combination table for steel structures. Until seismic forces entered the picture all loads were combined together as appropriate. What I would recommend is: DL + LL + Imp + Wind on Train + Wind on Bridge + CF + Nosing + Braking DL + LL + Imp + Wind on...- purdue86
- Post #2
- Forum: Bridge engineering
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Shear Keys for railroad bridge wingwalls
The first thing that you should do is obtain a copy of chapter 8 of the AREMA manual. Do you design highway bridges without AASHTO? The second thing that you need to realize is that the AREMA manual is manual of recommended engineering practices - not a set of specifications. If the...- purdue86
- Post #2
- Forum: Structural engineering general discussion
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Cooper E90 surcharge on bridge approach fill
The key phrase to understanding this is "the entire load shall be taken as distributed uniformly on the surface". The method generally used is to take the maximum axle load and distribute it in the longitudinal direction by the axle spacing. For a standard E-80 design that would be...- purdue86
- Post #2
- Forum: Constructed items general discussion
