I'm looking at a protentional redesign of rail bridge. The design calls for and EMD SD70 Locomotive, 33,700 Gallon DOT 112 Tank Car, and a Cooper E60.
AREMA only discusses design using the E80, the E60 is easy enough but I can't seem to find anything on the other two loads.
Sample calcs...
I have a bridge replacement project where we need to remove and replace a fire stand pipe attached to the bridge structure that is being replaced. The standpipe will extend from the top of deck down into a tidal waterway. The bridge size or geometry itself does not fire a standpipe, it's mainly...
I need to design some CFAs. Basically a steel micropile tube pushed into grout. From what I gather they are designed either as micropiles or drilled shafts. These are small diameter CFA and will be seeing some moment. AASHTO doesn't really provide any guidance for design other than axial...
The bridge owner doesn't want any downward camber in the long term (i.e. no tension in the PS beam bottom flange over time).
PCI has a procedure for estimating long term camber from creep and shrinkage using multipliers, but states that these multipliers are not applicable to bridges with...
I have a contractor that want to set the screen rail on top of a girder. They want to use a pipe receiver set on the beam and tack welded to the shear studs since they aren't allowed to weld to the flange. The receiver would have a smaller pipe and adjustable threaded rod that would be pulled...
I have a PS beam design where I am now designing the positive moment connection. The design calls for a significant amount of reinforcement at the pier diaphragm. The ends are going to be pretty congested. I could mix some hairpins with extending some of the prestressing steel but it's still a...
Does anyone know if Chapter 8, Section 2.1.5 AREMA has ben updated recently? I have a copy of 2015. Before I spend $1400, I would like to see if any updates were made. I'm looking to see if the crash wall requirements have changed-
Crashwalls for single column piers shall be minimum 2’-6” thick...
Working with a DOT on a current project, their prestressed beam details do not have flange ties in the bottom of the beam outside the anchorage zone (1.5h). Other surrounding DOTs I have worked with have a flange ties that are at a minimum placed with the web steel and tighter in the anchorage...
Does anyone know what the longest steel girder span or floor beam/stringer span system is in the US? Depth of girder would be a plus.
Looking to do some loooong spans with steel instead of segmental concrete or truss.
I'm looking for structural practicality, the bridge has access to a major...
Here is a question: on a steel girder, with a field splice, the bottom flange splice plate bolts. I have always detailed splices with the heads on the underside and the stickthough and nut on the top side of the bottom flange. This could apply to bottom lateral bracing as well.
I realize I...
I have been asked to design a whaler for a sheet pile wall. The anchors need to be spaced at 4ft max. The sheet pile wall is a PZ22. If the anchors are spaced at 3'-8" there would be an anchor at every peak (or valley) of each sheet pile section, essentially the anchors would be right next to...
I'm looking to design posts for a cable railing. Posts will be spaced at 4' to 5'. I plan to use stainless steel cable at 3" vertical spacings (likely 300# tension or so). Is there some guide for how long a cable run can be between the main support posts? I found that intermate posts should be...
Does anyone here have any experience using a jointless abutment on a long, curved bridge? The structures im looking at exceed 400' and one is over 800' long.
These lengths, plus the fact that they are curved, exclude the use of integral or semi-integral abutments, Deck extensions are also out...
I have a small pedestrian bridge, 90psf, H5 loading.
How do you handle braking forces for a pedestrian bridge? 25% of the H5 load seems excessive. Designing for it is controlling the pile design and is upping the number of piles required to reduce the lateral demand on the piles (timber pile...
Looking for a moldable strip seal material, maybe some sort of thick soft neoprene or maybe an epoxy putty strip or steel gap filler material. I want to use the material to sandwich a deteriorated saw tooth shaped sheet pile wall between an H-pile flange and a steel plate, bolted together to...
I'm looking to tie an existing sheetpile bulkhead to a new sheetpile bulk head. The client doesn't have the funds to replace the entire bulkhead so we are only replacing a portion.
The plan to to cut the existing sheeting vertical to the mudline, then cut horizontally below the mudline and...
I have a bridge replacement where we are planning to use PCEF bulb tees. As an alternative (looking to shorten construction time) we are looking at a beams with an integrated deck (NEXT, Deck Tees). We have spans of 110' so the NEXT beams are out. Deck tees can go to 140' according to the...
Due to some site constraints I have a bridge that may require a skewed abutment. The beams are PC bulb tees. The bridge is 3 spans, 62'-75'-62', simple made continuous. The end span would now vary from 62' to 75'.
Are there any issues with varying length PS beams made continuous that couldn't...
I have a bridge that is pretty wide. Out to out is 101', 4 lanes, with shoulders and shared use paths on both sides. At what point does this become two adjacent structures?
It's wide enough now that we need to consider expansion in the transverse direction with the bearing design, breaking up...
