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  1. broekie

    dissimilar metal connections

    Bare material. No coatings. Outdoor environment, but not corrosive.
  2. broekie

    dissimilar metal connections

    I know that connecting dissimilar metals is not recommended. I've looked at galvanic corrosion charts, but I've had a hard time making good sense out of some of the tables I've seen. My specific question is about these connections: 1. stainless steel to galvanized steel 2. aluminum to...
  3. broekie

    Analysis of existing billboards...

    You can also check out the publication: AASHTO Specification for Structural Supports for Highway Signs, Luminaires, and Traffic Signals
  4. broekie

    P/S Strands in the top of a box beam?

    I put 2 strands in the top of a box beam all the time with no problem.
  5. broekie

    Calculating load on steel grating

    Many bar grating manufacturers list an allowable distributed load as well as an allowable point load in their literature.
  6. broekie

    PT Straddle Bent

    We've done one of those designs and we wrote our own spreadsheet to do the design.
  7. broekie

    Integral concrete pier caps

    Yakpol, You're right. There are a lot of things that we need to look at in more detail - clear distances between tendons and edge of concrete being one of them. We're only at about 10% design phase at this point. But we'll have to probably sweep that tendon from 18" (VSL requirement) to 9"...
  8. broekie

    Integral concrete pier caps

    Tumbleleaves: 1. I'm looking at having to provide approximately 3800 to 4000 kips of P/T force in the final condition. The control is bascially bending. I have a single column hammerhead pier cap. Top fiber tension stress at the face of the column is what is controlling (at least so far in...
  9. broekie

    Integral concrete pier caps

    Graybeach is exactly correct. Based on the geometry of the interchange, we don't have vertical clearance to do a conventional pier cap. The road underneath can't be lowered enough to make it work. We also only have room for a single column, so the cap cantilevers out 20' or so from the face...
  10. broekie

    Integral concrete pier caps

    Does anyone know if there are design examples and/or other information somewhere out there for a curved steel girder bridge with an integral post-tensioned concrete pier cap? I'm working on a bridge where we will most likely be utilizing that kind of system. I've done PT pier caps before, just...
  11. broekie

    Bridge Pedestrian Loading

    The 5th edition of LRFD (2010) says that a pedestrian load of 75 psf shall be used for all vehicluar bridges. If you are designing a pedestrian bridge, the latest version of AASHTO directs you to the guide specs: "Bridges intended for only pedestrian, equestrian, light maintenance vehicle...
  12. broekie

    Line, Circle, Polygon, Etc... Will Not Show Up.

    Check what levels are turned on in the different views.
  13. broekie

    LRFD Foundation Design

    For the bridge work that I do, our geotechnical engineers do give us factored bearing capacities.
  14. broekie

    Pedetrian bridge vibration

    I am working on designing a pedestrian bridge based on the new AASHTO LRFD standards. According to section 3.6.1.6, the fundamental frquency of my bridge has to be higher than 3 Hz. I am having a hard time making this work and it's going to cause me to have a really deep section, almost to the...
  15. broekie

    Protecting a Concrete Pipe

    I have a road/bridge project that I am working on where we have a 36" diameter concrete pipe that was covered with 6.5' of fill. After the project is done, the pipe will be ocvered with 24' of fill in some spots. The pipe can't handle that amount of fill, so we will need to protect the pipe in...
  16. broekie

    retaining wall with clay backfill

    Does anyone out there have experience with designing reatining walls with clay backfill. I have a situation where I need to evaluate an existing wall. I have never designed one with clay backfill (only sand). The material that I have gives 2 methods. The vertical reinforcing in the wall...
  17. broekie

    Strengthen existing retaining wall

    I am working on a project where the client has an existing retaining wall that needs to be raised a couple of feet. The wall is holding back an earthen dam. The problem is that when I analyzed the existing wall with 2 additional feet of height, the bending moment capacity at the base of the...
  18. broekie

    hydraulic separation walls

    Thanks for the input. I do have a baffle for the pump station. The storm water enters the pump station directly opposite one of the pumps. However, the water hits a solid wall and splits in 2 directions. This water then goes through trash racks before it has a chance to enter the pumps...
  19. broekie

    hydraulic separation walls

    I have a questions regarding water pump station design. I have a 25' diameter pump station with 3 submersible pumps. On rectangular pump stations that I have seen, there are divider walls/hydraulic separation walls between the pumps, I'm assuming to avoid cavitation type issues. Are these...
  20. broekie

    Footing below water table

    Again, thanks for everyones' help. The wall has been designed for the water table below the footing, the water table 8' above the bottom of footing (ordinary high water elevation), and the water table at 13' above the bottom of footing (100 year flood stage). It has also been designed to...

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