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  1. tjhubo

    Load location does not have a node.

    cbrn, thank you very much for the information. My problem was that I have a 3D mesh, but the applied force location is subjected to random change. So I cannot guarantee I will have a node at the load location. Following the idea in your reply, I think a possible way for me is to put a new...
  2. tjhubo

    Load location does not have a node.

    Thanks, Brian I thought ANSYS might have something which can transfer an arbitrary force into nodal forces. Unfortunately, it seems not. :-(
  3. tjhubo

    Load location does not have a node.

    Hi, For a 3D model, is there any easy way to apply a load whose location does not have a node or key point in ANSYS? Thanks in advance.
  4. tjhubo

    continuous box girder

    I don't have a book by hand. I think if you want to look up something about warping force, any thin-walled structural mechanics book will talk about it.
  5. tjhubo

    continuous box girder

    Maybe my reply here is a bit late. From the questions you raised, I guess you don't have a lot experience with this kind of structure, neither enough guidance from some experienced engineer. Since PC Box Girder Bridge is a complicated structure, I strongly recommend you be very careful with...
  6. tjhubo

    Segmental Box Girder Analysis

    Since balanced cantilever construction method could be done with different closure sequences, the moment diagram in Fig. 3.18(b) is the result from the closure sequence specified in Fig. 3.18(a). How to calculate the bending moment when construction is completed: 1. Have a continuous beam of...
  7. tjhubo

    shear lag in box bridge

    Usually in transverse analysis, shear lag effect is not considered. For longitudinal shear lag effects, see ASSHTO LRFD Section 4.
  8. tjhubo

    Carbon Fiber Repair?

    Actually, the stiffness of normal carbon fiber/epoxy composite is lower than that of structural steel. If the weight of the retrofitting material is not that a big deal, I don't see the necessity of using it, since it is much more expensive that steel plate. The features of carbon or glass...
  9. tjhubo

    creep and shrinkage at crack section

    Yeah. Dinosaur made a good point on the prestressed concrete design.
  10. tjhubo

    creep and shrinkage at crack section

    Actually creep and shrinkage are two different phenomena. Creep is the time-dependent deformation which has the same sign with the original deformation. Say if you have a tensile strain in concrete, without external constraints, the creep effect will result in a larger tensile strain as time...
  11. tjhubo

    Steel beam insert into a CMU wall

    Hi, I want to insert a W8x18 steel beam into a CMU wall trying to have a 4' cantilever at the other end of the steel. Can anyone give some suggestion about the connection detail between the steel shape and the CMU wall on both top and bottom flanges. Thank you in advance.
  12. tjhubo

    Lateral design for high plane aspect ratio

    Thank JAE and DaveAtkins for your helpful reply. I am wondering if I could use some CMU buttress to take the lateral load for this case?
  13. tjhubo

    Lateral design for high plane aspect ratio

    I am working on the lateral design of a 4-stroy residential construction, which has the first story built with CMU, and upper stories with wood frame. Since located in city, the house has a plane size of 18’x70’. Furthermore, the owner wants to make a big opening at the front 18’ wall for...
  14. tjhubo

    yield strength for W-shape

    Hi, everyone, When designing a building structure, do you ever use yield strength 50 ksi for W-shapes? And I am also wondering what's the difference between A441 with 50 ksi and A572 Grade 50, in performance or in cost? Thanks very much for your reply in advance!
  15. tjhubo

    StaadEtc foundation design results

    The situation I have is just axial load, about 50 kips totally. The Staad results indicated rebar on both bottom and top of the footing. For this load level, common practice just needs rebar at the bottom of the footing. I am wondering if the staad suggestion is conservative.
  16. tjhubo

    StaadEtc foundation design results

    It is my first time to use StaadEtc to design a column foundation. The results seemed to be too conservative to me, compared with some design tables. Does anyone have the same feeling with me? Thanks in advance for your idea.
  17. tjhubo

    steel weight estimate

    Does anyone here happen to know for a gross estimate, what is the average steel material weight per square foot for a typical single story grocery store building, including all the joists, beams, and columns? Thanks in advance.
  18. tjhubo

    load on strip footings

    npthao121 Your idea is very helpful to me. Would you like to tell me which reference I could follow to calculate the surcharge, or how to decrease the soil bearing capacity? Thank you evry much for your help.
  19. tjhubo

    load on strip footings

    craigory28, Thanks a lot for your reply. I agree with you on the points you made. what I am concerning now is if we have a slab on grade with large span, maybe the settlement of soil between two footings would cause some extra load on the footings. I know it is less likely to happen because the...
  20. tjhubo

    load on strip footings

    When determining the load on a strip footing, how do you consider the possibility of the load transfered by the basement floor? Some guys think we don't need to look at it. What's you opinion? Thanks.

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