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Recent content by hoshang

  1. hoshang

    Truss Top Chord Lateral Support

    In post #4 my thought was to add top struts to laterally support the top chord. So, this is how my query came out: Can floor beams be placed higher than bottom chord elevation (i.e., 500mm above bottom chord)? If so, assuming vertical members of the truss are HSS (square or rectangular) and...
  2. hoshang

    Truss Top Chord Lateral Support

    Hi BA, Can floor beams be placed higher than bottom chord elevation (i.e., 500mm above bottom chord)? If so, assuming vertical members of the truss are HSS (square or rectangular) and floor beams are wide flanges, how would the connection be between them? Is it a shear tab connection? I'm...
  3. hoshang

    Truss Top Chord Lateral Support

    So, the load path for gravity would be: decking-stringer-floor beam. These gravity loads together with the truss self-weight would be transferred to the bottom chord and then directly to the inclined member. Isn't it? I wounder if there are constructability issues of this setup. This is for the...
  4. hoshang

    Truss Top Chord Lateral Support

    BA, Excuse me not figuring it (E is my second language). Can you elaborate more on this?
  5. hoshang

    Truss Top Chord Lateral Support

    But there doesn't seem any attachment between the green and red lines. They're at different elevations. I drew the yellow member at a noticeable location. There exist a yellow member (floor beam) over the red member too, isn't it? If so, can't they be combined into one member? Please see...
  6. hoshang

    Truss Top Chord Lateral Support

    BA, appreciate your valuable insights. Please find the attached image: Assume the cables and its supports don't exist, the truss is supported by the inclined member (blue) via bottom chord (green). Why is the horizontal member (red) is there? Can't floor beams (yellow) between the blue lines...
  7. hoshang

    Truss Top Chord Lateral Support

    Can cross brace members be ignored in gravity load analysis if they were to be considered as tension only? If so, the support structure in the foreground would seem like the attached image, isn't it?
  8. hoshang

    Truss Top Chord Lateral Support

    Hi BA, Thanks. I found how it's calculated in the design example. If the pedestrian bridge were to be supported as shown in the attached image, is there a calculation approach to design the columns of such inclination?
  9. hoshang

    Truss Top Chord Lateral Support

    Hi BA, when the truss is made in shop, it would be installed at the field. So what would be the loading during lifting the truss at the field? Are they the reverse of the service load? I mean would compression members at service be tension during lifting? Another query: AASHTO LRFD Guide...
  10. hoshang

    Truss Top Chord Lateral Support

    Hi, what are the fabrication, erection, and installation loading for these types of construction?
  11. hoshang

    Truss Top Chord Lateral Support

    BA, The pedestrian bridge is a two span truss, each 90ft long, 10ft wide, 7.5ft high. The floor would be checkered plate 1/8in thick. As a side note: what are the fabrication and erection loading for these types of construction?
  12. hoshang

    Truss Top Chord Lateral Support

    Yes
  13. hoshang

    Truss Top Chord Lateral Support

    ViaParadise said: For linear consideration, unless your web members are moment connected to the top chord then they don't provide out-of-plane resistance. But you could also just add a moment connection out-of-plane at midspan and half that unbraced length. Can you elaborate more on this?
  14. hoshang

    Truss Top Chord Lateral Support

    Do you have a reference on your approach? My thought is to add top struts as well.
  15. hoshang

    Truss Top Chord Lateral Support

    Hi all, For a Pratt truss, lateral support is provided by a transverse U-frame consisting of the floor beam and truss verticals. What about a Warren truss? It doesn't have verticals.
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