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  • Users: yjung
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  1. 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...
  2. 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...
  3. 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...
  4. 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?
  5. 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...
  6. 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
  7. 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?
  8. yjung

    Base plate design

    Hi, I am designing many baseplates for light poles. I have a question on how to find out the plate thickness and size with applied moment, torsion, axial load and shear. Most of examples on books of baseplate calc's don't have moment and torsion, but only an axial load. Do you know where to...
  9. yjung

    direct shear and torsion.

    Hi, While I calculate the max shear stress at the base of a pole, Do I have to combine the direct shear and torsional shear or they are never occurs together?? I am not sure, but I think, the torsional shear is circling shear force and the direct shear is against one side and add on the other...
  10. yjung

    Difference between Longitudinal and Transverse LL DF

    Could anyone explain me what the difference between Distribution of Wheel loads in Longitudinal beams and transverse beams is? I am using everyday but always confused. For example, In AASHTO 3.23.4.2 says "In calculating bending moments in multibeam precast concrete bridges, ,,,,, no...
  11. yjung

    ESWWR Vs Conventional steel reinforcing.

    Hi all, I have a question on using ESWWR (Engineered structural welded wire reinforcement). I have #5@12" reinforcement specified on the plan. Someone wants to use ESWWR by finding equivalent area of steel and spacing. Does it really work? If they can weld the between bars why they need...
  12. yjung

    ESWWR Vs Conventional steel reinforcing.

    Hi all, I have a question on using ESWWR (Engineered structural welded wire reinforcement). I have #5@12" reinforcement specified on the plan. Someone wants to use ESWWR by finding equivalent area of steel and spacing. Does it really work? If they can weld the between bars why they need...
  13. yjung

    where can i find a nice design example of bolted beam splice design?

    Hi, I need to design ASD bolted splice design for my bridge widening project. Does anyone know where i can find a nice design example of bolted spice design for a steel beam? Thanks
  14. yjung

    Distribution of wheel loads through Rigid pavement.

    Hi all again, I have a question regarding Live load distribution through rigid pavement. The AASHTO code only talks about the live load distribution through earth fills for buried structure. I have about 1.5 ft concrete pavement on top of the 4 ft earth fill. Should i still follow the AASHTO...
  15. yjung

    Live load distribution through rigid pavement

    Hi all again, I have a question regarding Live load distribution through rigid pavement. The AASHTO code only talks about the live load distribution through earth fills for buried structure. I have about 1.5 ft concrete pavement on top of the 4 ft earth fill. Should i still follow the AASHTO...
  16. yjung

    is 56 ft span slab can be designed w/o using pre/prestress option?

    Hi all, again, I have 56 ft span one-way slab with 10 ft soil cover including 2 ft LL surcharge, a lot of dead loads on top of the slab. i have only 30 inch thick for slab design. The slab is supported by drilled shaft. (Acting like frame) No column in middle of the slab. I have tried everyway...
  17. yjung

    IS IT TUNNEL OR BOX CULVERT?

    Hi all, I have a tunnel-like structure that 300 ft long and 56 ft wide. This will be built under the existing highway. It will have two lane capacity for HOV with 16 ft vertical clearance. My question is that is this tunnel or not? what is the design code if this is tunnel? I am having a hard...
  18. yjung

    does this structure called as "tunnel" or bridge ?

    Hi all, I have a tunnel-like structure that 300 ft long and 56 ft wide. This will be built under the existing highway. It will have two lane capacity for HOV with 16 ft vertical clearance. My question is that is this tunnel or not? what is the design code if this is tunnel? I am having a hard...
  19. yjung

    "V" shape column design

    Hi, all. I have "V" shape column with longitudinal moments, shear and axial loads. This is design build job(not much time). I have an old drawing that the main reinforcement was inclined by 30 degree along the V shape and the bars are connected to drilled shaft foundation with 90...
  20. yjung

    how to model Horizontally curved concrete bridge?

    HI ALL !! i have found many useful information from this site since i got the first job in bridge design. Thanks very much. I have a project that the bridge is curved a lot. I am trying to model the horizontally curved concrete bridge to obtain the moment and shear.I do not know how to model...

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