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  1. t230917

    Design of slab with opening

    I am designing a top slab for a junction chamber. The junction chamber consists of connecting 2 ends of a 10 feet wide x 4 feet high concrete box culvert. As part of this design, the top slab has an opening for a 4 foot diameter manhole. The top slab is 1'-1" thick. The manhole is ~10 feet...
  2. t230917

    Design of shear studs connected to soldier pile walls/concrete facing

    How do I go about designing the shear studs welded to soldier piles and connected to the concrete facing? I referred to this thread: thread507-152519 But I need a little more information than was discussed in that thread.
  3. t230917

    Dead load deflection calculation for bridge design

    I had a question regarding dead load calculations for bridge design. The specific bridge type is concrete deck on steel beams with concrete parapets. Per IDOT, we have to show top of slab elevations on the plan sheets, after adjusting for dead load deflections. While calculating these dead...
  4. t230917

    Attaching traffic signal heads to underside of post tensioned deck

    Hello I am working on a project where the traffic folks want to attach new 8" traffic signal heads to the underside of a post tensioned deck. Has anyone done this before, and how should I proceed? Can I make connections to the underside of a post tensioned deck? i am going thru the as built...
  5. t230917

    Stability of soldier pile retaining wall

    I am designing a soldier pile wall for the first time with the following: Retained height - 11.2' Ka=0.46, Kp=1.6 (after using reduction factor from AASHTO), pile spacing=8', concrete dia.=3', phi=30 degrees, unit weight-120 pcf from backfill to excavated height, and then reduces to 80 pcf, LL...
  6. t230917

    Design of Solider Pile Wall

    Hello I am in the process of designing a soldier pile wall for an access road. The max height of the wall is 12 feet and the SGR recommends drilled soldier pile walls as the best alternative. I have not designed a soldier pile wall before and needed help with how to get started. I am starting...
  7. t230917

    How to avoid negative fillet(haunch) for plate girder design on bridge

    Hello I am designing a 2 span bridge (concrete deck on plate girders). The bridge has 7 girders with varying spacing. On 2 of the 7 girders, I am getting a fillet(haunch) height which is less than the minimum allowed for plate girders (3/4"). The remaining 5 girders are OK. How do I get around...
  8. t230917

    MDX for Steel beam concrete deck bridge

    Hello All I am trying to use MDX to design a steel beam concrete slab bridge and wanted to get some help with several aspects of the design. MDX support is not the most helpful with this kind of stuff so I wanted to know if anyone else has used MDX for this purpose and can answer a few...
  9. t230917

    Cost of jacking a 10x4 box culvert

    I am looking for costs of jacking in place a 10x4 box culvert OR 2-60 inch pipes in its place. I am also contacting contractors, but wanted to check if anyone has any experience with this, especially as it relates to the cost of construction. I am currently assuming $2,000/foot and wanted to...
  10. t230917

    Construction of Wingwall for box cuvlert

    I am designing a 12x3 cast in place box culvert, wherein the south wingwalls need to constructed in sync with the slopewall of an adjacent bridge. The problem is that the bridge slopewall will be built 12-18 months after the construction of the box culvert. What are my options for the...

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