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  • Users: dison
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  1. dison

    Drilled Shaft (or Pier or Caisson) Construction Clearances

    I have placed a few exploratory calls to contractors who install drilled shaft foundations, but I don't have any personal contacts with them and haven't received any info back yet, so I thought someone in the forums might be able to help. I'm investigating overhead clearances required to...
  2. dison

    Bonding steel to steel

    What you would like to do doesn't sound overly optimistic. In fact if it's on the small scale that I imagine from your second post, it may not even be all that expensive. There are epoxy adhesives that are specially formulated for bonding steel surfaces and are heat and impact resistant. If...
  3. dison

    Bonding steel to steel

    I hate to be a master of the obvious, but what could be better for bonding steel to steel than steel - is welding possible? If not, many epoxy products are available that may meet your requirements. You will have to contact the manufacturers to determine which product is right for you. Just a...
  4. dison

    Braced excavation

    My understanding is that the distribution of soil pressure for braced or tied back excavations have been measured in-situ on many projects and the distributions you indicate are the ones recommended by AASHTO and other official groups to most closely match actual expected conditions. Also, the...
  5. dison

    SORTING a Worksheet With Merged Cells Not Same Size

    The text you want to see should be typed in the leftmost column. Select the four cells. Go to format cells - horizontal alignment - center across selection. As long as nothing else is typed in the other three cells, this will do the job. ~dison
  6. dison

    SORTING a Worksheet With Merged Cells Not Same Size

    Just to add my two cents: I have never found any use for merging cells. Merge prevents changing column widths and causes the sorting problems mentioned above. A better option is to use different formatting techniques, such as center across selection and breaking up text to give your...
  7. dison

    Retaining Sand

    I just had a thought: Could you build a sort of retaining bridge? Build large "piers" outside the limits of the existing bridge on both ends of the retaining wall. Then use some method to bridge between the "piers" that won't require any overhead clearance. The supports...
  8. dison

    Retaining Sand

    I am no expert in soil freezing, so don't take my word as the absolute truth. My understanding is that this method of soil retention works best in saturated, uniform soils. It has been used before, but I don't know how successful it has been. You should get in touch with a contractor who has...
  9. dison

    About Temporary work of building bridge or structure

    I believe what you are asking about is falsework or shoring. The details of falsework are usually designed specifically for each project by the contractor who is tasked with erecting the superstructure for a bridge. The type of falsework required depends on the type of superstructure and also...
  10. dison

    Repair, maitenance & rehabilitation

    Several techniques are available to repair and strengthen reinforced concrete. The problem will be choosing the one that fixes the problem, causes the least disruption to service, and costs the least. If the beam is fully accessible and temporary shoring can be erected to unload the beam, all...
  11. dison

    Concrete Beam Design

    I am not sure of your loading conditions for this grade beam supported on two footings, so I cannot give an opinion on which way would be the best way or required way to transfer the given loads. However, I can give a general response based on a general design of beams. You can design it...
  12. dison

    Steel axial compression equation

    jackzhong: The chances of actually getting the term &quot;Cm/(1-fa/Fey)&quot; to be less than one seems to me to be very unlikely. You would have to get an extraordinarily small fa in order to make the term <1. However, when fa/Fa is less than or equal to 0.15, AISC permits equation H1-3 in...
  13. dison

    torsion on bridge girder

    Now I am getting a little frustrated. A colleague of mine adamantly insists that NO torsion is present in this girder. He believes that the only effect of the eccentric load is that the reactions at the bearings will also be eccentric and that only vertical shear is present if you took a...
  14. dison

    torsion on bridge girder

    flame & ishvaag, Thanks for the responses. I also believe that torsion is present based on the restraint provided by the dead load of the bridge. However, there may be something I am overlooking or not looking at correctly. Just to clarify a few things: - there is no bridge deck, the top...
  15. dison

    torsion on bridge girder

    Please give me your opinions on what exactly is going on with the following situation: - short simple span bridge - two concrete slab girders side by side - bearing at each end on one or more elastomeric pads - no positive connection holding the girder down to the substructure (gravity...
  16. dison

    Prestressed Girder Failures

    Thanks! Comments so far have been great. A few other questions to add: What are the major causes of loss of prestress forces over time (creep or strand slip beyond the predicted losses)? In your opinion, what is the shortest practical span length for which prestressed concrete is practical...
  17. dison

    Prestressed Girder Failures

    I am trying to develop a list of all the potential ways/reasons a prestressed concrete girder could fail. For example: inadequate concrete strength inadequate flexural capacity overload uneven bearing support loss of prestress force due to corrosion of strands loss of prestress force due to...
  18. dison

    Railroad Thru Girder Bridges?

    Great question! This is what I have been told, and it does make sense, but it may not be the full story or the &quot;historical&quot; reason: The end of the thru girder is generally curved and the top flange is continued all the way down to the bottom flange in order to protect the web in the...
  19. dison

    Empty Weight of Trucks

    I don't think using the theoretical trucks will help you in this situation (as they are theoretical and not tied to an unloaded or partially loaded real-life truck). You need to get actual axle configurations and weights in order to complete this task. If the contractor is serious about using...
  20. dison

    Rock Anchors

    You might want to check out manufacturer's of specialty grouts for rock anchors such as Fosroc - they should have bond information for their product readily available. ~dison

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