"A truss for this situation would get too large"
What do you consider too large?
I doubt the trusses will be prohibitively heavy.
As the structural engineer of record for a few mobile mining equipment structures, ditch the cables and use steel shapes. The only time there are cables is when...
COE EM 1110-2-2502, "Retaining and Flood Walls"
link: http://www.4shared.com/file/47771412/f792c17d/EM_1110-2-2502-Retaining_and_Flood_Walls.html?start=
Engineers, I appreciate you comments. We have decided to go overhead. It was getting way to complicated going underneath. The geotechnical engineer was proposing grout injections, but for some unknown reason did not address the slope stability risks. We lost confidence in his abilities, so we...
Very good points cvq. Thanks. The tracks can not be allowed to settle. Groundwater not a problem. Choice of tunnel type is wide open. No expansive clay. Jacking a culvert may be possible if equipment is readily available. Location is South America.
Anyone have example projects and/or design guide references or suggested methods of construction? It is through sandy clay type of material. The railroad has to be functional during construction of tunnel.
I designed a belt conveyor structure recently that had belt tension loads T1 and T2 of 60 kips each during normal operation and nearly twice that during motor startup. This produced significant loads on the supporting structure.
What I use is contained in EM 1110-1-2502, 29 Sep 89, Figure 3-27, p. 3-50. This document can be downloaded at the following URL: http://www.usace.army.mil/publications/eng-manuals/em1110-2-2502/entire.pdf
"Sheesh. Some days it just doesn't pay to get out of bed."
Obviously, I calculated an incorrect lateral load to apply. The load should be design load of the compressive flange. Using the same example but changing the concentrated midspan vertical design load to 7 kip; 7 kip x 20'/4/0.95'moment arm = 36.8 kips. Then 2% = .736 kip lateral midspan load...
