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  • Users: BridgeEI
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  1. BridgeEI

    Brick Manhole Design

    I am looking for some references regarding the design of manholes that are constructed of brick and mortar. I have a reviewer who is asking for documentation that an opening which has been plugged with brick and mortar is capable of handling the lateral force from the earth pressure. I’ve tried...
  2. BridgeEI

    Chain Drag

    Is there a place to buy a chain drag to use on a bridge deck? Or does everyone make their own? I can’t seem to find a place that sells them as a piece.
  3. BridgeEI

    Transporting Stress Limits & Loads Specification

    Is there a guide by AASHTO or other agency that defines loads/stress limits/etc on items that are being transported? For instance, tensile stresses/lifting points in a pcb or steel girders? I figure fabricators, or their engineers, use something but wasn't sure of a publication or if there are...
  4. BridgeEI

    Guide Specifications for Wind Loads on Bridges During Construction

    Has anyone obtained this new publication by AASHTO? I'm wondering how much info is really in it. I deal with steel plate girders a lot so I'm trying to see if the cost is justified or not.
  5. BridgeEI

    ASCE 7-10 Wind Provisions

    I am studying for the lateral portion of the SE exam and I am confused with the ASCE 7-10 wind provision chapters 26-28. I'm in the bridge world so I don't deal with 7-10 but I was somewhat familiar with 7-05 and it's all different than what I was used to. What is the difference between the 3...
  6. BridgeEI

    Parapet dead load deflection

    I have a fairly wide bridge with 10+ girders and I'm curious how others take care of the composite deflection for the traffic rail/parapet. For strength design, I distribute the rail weight to no more than 3 beams. But what about for the deflection? I'm waffling back and forth whether to use...
  7. BridgeEI

    AASHTO Type I Beam

    I have a project that we are considering using the Type I beams, but it seems like the local precasters can't find the forms anymore. It's not common to use this beam but we have a special circumstance. Wouldn't the precasters still be able to do the beam even if it was 3-5x more expensive...
  8. BridgeEI

    Painting Exposed Structural Steel

    Are there any references that give ideas of paint systems to use with structural steel that is exposed to different environment types? I have a very small project next to a wastewater treatment plant and corrosion is a concern due to the gases. I'm looking for something that specifies the...
  9. BridgeEI

    Small Firm Quality Control

    I was wondering how one man shops do quality control on their calculations and drawings. Do you sub out to someone to check your math or just set aside for a few days?
  10. BridgeEI

    Pipe Rack Design Fee

    Are there any of rules of thumb for the design fee of a pipe rack? I have a fee created and just want to know if I'm in the ballpark. It's been a while since we have done one so I'm little rusty.
  11. BridgeEI

    AASHTO Interims

    The pages can't simply be replaced anymore (for some time now...) and the way AASHTO prints them, they don't line up well with the format. How is everyone organizing the Interims to the LRFD Bridge Design Spec? Are you making notes in the original and just stating to see the Interims? I'm...
  12. BridgeEI

    Estimated bridge costs

    I've had the most random project come across my desk. I need to determine cost per square foot of several bridge types. I don't have any information or experience with arches, suspension,or cable stayed bridges. I looked up some signature bridges and found the cost, lengths, and widths for a...
  13. BridgeEI

    Startup experience

    Adding to another thread about starting an engineering firm, how much experience did you have when you finally ventured out?
  14. BridgeEI

    Heat straightening girders

    Does anyone have any good references for heat straightening girders? What about beams that have already been partially replaced before that need to be repaired again? Does the existing patch need to be replaced or can you replace a smaller area that's within an existing replacement section?
  15. BridgeEI

    Double composite box girders

    Waiting on my flight so I can get home from the steel bridge symposium and I was thinking about some of the topics that were covered. Has anyone in the US ever designed one or know any that exist in the states? I thought it was an interesting concept however I don't think aashto addresses them...
  16. BridgeEI

    Composite Steel Truss

    Has anyone ever seen/heard of a composite steel truss? To clarify, I mean that the stringers/floorbeams would be composite w/ a concrete deck that is placed on top. I'm wondering if this has ever been done.
  17. BridgeEI

    Work slowing down

    In the last couple of months work in our firm has started to slow way down. We have plenty of projects in the backlog, a couple really big projects but will eventually take another 1-1.5yrs before any bridge work really begins. There is a project or two that has a lot of work still to be done...
  18. BridgeEI

    Reducing temperature axial force

    I have a floorbeam that is pinned at both ends with a temperature load applied to it. As expected, this produces a very high axial force. To reduce the force I will allow the support to move say 1/8". If I specify "enforced but" supports and a support displacement would that be accurate or is...
  19. BridgeEI

    High Performance Steel

    Does anyone have experience w/ or have some really knowledgeable references covering high performance steels? I've done some searches and found some information but I'm always looking for more. One specific question I have is if rolled shapes are produced in these types of steel. Everything...
  20. BridgeEI

    Pier/column development length

    A sr. engineer has been checking a set of plans that I had done a while back and questioned the development length of the reinforcing in the column to the pier cap. I used the basic development length, but did not include any modification factors. Would you use the basic development length or...

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