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  • Users: yjung
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  1. yjung

    Railroad Bridge

    FYI You will find a good summary about the Steel bridge spec through Oregon state bridge manual. (This is for myself in the future.)
  2. yjung

    manuals or any guidelines for railroad underpass?

    Thanks HG I will be seeing you within couple days with other qeustions. 60% is done for the town, and.. I now have to prepare the 60% UP submittal with everything within two weeks.
  3. yjung

    manuals or any guidelines for railroad underpass?

    I could download the manual. Thanks Mike80
  4. yjung

    Railroad Bridge

    Thanks HG The bridge type for this job is steel plate girders with steel deck, fortunately it is not steel throught-girder brg. We do not need thousands of the shear studs for this project compared to concrete deck bridges. I will do more research on this matter for 90%.
  5. yjung

    Railroad Bridge

    This is my first RR bridge. So, I got the unit price from my highway bridge experience. I thought the total weight, 1.5 million #, may reduce the unit cost? I called around but i could not find any fabricator who can give me a good # in the state. We may have to order from out of state.
  6. yjung

    Railroad Bridge

    I had to decide a # for the 60% submittal yesterday,due day. My total steel weight is 1.5 million #. Initally i decided to use $1.8/# for the 60% submittal, and i am in Arizona, which was the same $ as 30% estimate. Last night, i could not sleep with that #. So today i am going to increase...
  7. yjung

    Railroad Bridge

    HgTX Which company are you working at? I should work for you.
  8. yjung

    Railroad Bridge

    No, AREMA said, two ASTM are the same. We can use any.
  9. yjung

    Railroad Bridge

    I am designing a UPRR underpass, multi-tracks, the superstructure is steel plate girder with steel deck, located in Arizona. I have some question on the ASTM. I designed the steel girder using 50ksi steel, but i am having hard time with what kind of ASTM steel to be used for this bridge. I am...
  10. yjung

    manuals or any guidelines for railroad underpass?

    Do you know the website address for CSX manaul? I got a manual from SCRRA, but not from CSX.
  11. yjung

    manuals or any guidelines for railroad underpass?

    sorry, It is defined as a underpass. (However, I think it should be a overpass, since the railroad is over the main roadway.)
  12. yjung

    manuals or any guidelines for railroad underpass?

    I do not know anything about railroad bridge design, but i have to design a railroad. anyone knows what kind of manuals or any kind of guidelines for railroad underpass other than AREMA and UP manual available and where to get that? I am looking for this for days, but none so far. AREMA and...
  13. yjung

    what is "E.C. HOLT'S RESEARCH and U-FRAME"?

    Thanks VOD, Could you explain me little more about the method? What does "BS5400" stand for? Is there any nice web site for its method?
  14. yjung

    what is "E.C. HOLT'S RESEARCH and U-FRAME"?

    I never seen this before. so please help... I was reviewing the Ped. steel truss bridge. I see that Truss members for top and bottom chords were designed by what is called "E.C. HOLT'S RESEARCH and U-FRAME"? Can anyone explain me about its method, why, how it works for the truss chords...
  15. yjung

    aluminum-steel bolted connection

    what kind of washers, base plate, anchor bolts and so on for the Aluminum structure? Can we use steel anchor bolts, plate, washers etc with aluminum structure? special paint?
  16. yjung

    What is the max. curvature that post tentioning can be done?

    Thanks Qshake!!! Yes, this bridge is for a lane freeway ramp. Is the max overhang 7 ft and min 6 inch overhang reasonable, if i really want because of the bridge curvature? I am in AZ, people told me that the curved structural steel cost is very high, when compared to concrete cost. Qshake...
  17. yjung

    What is the max. curvature that post tentioning can be done?

    I have a curved bridge for the cost analysis. The radius is 167 ft with 4 span bridge. Each span is about 80 ft. My question is; can i use a post tension box girder with this curvature or not? Anyone knows where i can find the limit of post tensioning for the horizontally curved bridges? My...
  18. yjung

    AASHTO loading interpretation for Pier design

    Hi all, Whatever Qshake says, he is right.(I think he knows everything.) I came to this forum about 3 years ago to ask some question about the bridge design. At that time I was an entry-level bridge designer. He answered my question in a good way. I believe ROWE did good job here too. I now...
  19. yjung

    shotcrete concrete pull out strength?

    Hi, I have a steel rod, 5 inch embeded into the f'c = 2000 psi shotcrete concrete about 7 in thick. How can i compute the max allowable pull-out tension force that the concrete can resist? thanks
  20. yjung

    How many US DOT are currently using AASHTO LRFD for bridge design?

    I am wondering how many US DOT are currently using AASHTO LRFD code for their bridges. Arizona = ASD Washington = LRFD I am not sure about other states. Can anyone tell me about it?

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