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Recent content by Henry94606

  1. Henry94606

    TJI collar tie

    I understand TJI are not made to work with collar. In typical gable roof I used TJI-9.5" for longer span and cheaper price compared to sawn lumber. Ceiling joists (red) then run parallelly with TJI and coil strap (green) at ridge beam. So far it has been oked, approved by AHJ a few time. I read...
  2. Henry94606

    Roof hip

    Thank you all for your taking the time responding to this post. It s obvious I am not an engineer (I am an architect) learning piece by piece from this valuable forum. This post teaches me: 1) the cosine adjustment value is referred to the slope of the hip. 2) both the hip or valley should be...
  3. Henry94606

    Roof hip

    Thank you. I guess the rule of thumb "hip carries half the load" came from old timers when paper and pencils were still used. My old drafting technique always draw hip roof at 45° line, which yield its cosin value to 0.7, from your math. If so the rule of thumb at least should be "three quarter...
  4. Henry94606

    Roof hip

    Hi structure engineers, I ve been told roof hip carries half the load of supported rafters. As in this pix, I can see it carries half the load of red rafters, and other half of the blue rafters, approximately. So, correct if I m wrong, half and half is one. By geometry, it seems the hip...
  5. Henry94606

    roof ledger tie

    hi everyone On wind diagram zone 3 and 5 i have both negative and positive values of 25psf. In middle of a flat roof i have rafters tie to a ledger that in turn ties to a bearing wall. To simplify, if tributary area 500sf, A35 tie =1kip, My calc : total wind load 25#*2*500sf/1kip=25000/1000=25...
  6. Henry94606

    Number of sill bolts

    Thank you. The test is in multiple choice. I guess the correct answer are at odd in order to throw off people from guessing. Can you point direction to where i can get that info about sill bolts in plane capacity ? My Google points t unreliable sources
  7. Henry94606

    Number of sill bolts

    On the architecture license exam, lateral part, question: on a 13 ft long wall that has 606#/ft unit shear, how many sill bolts of 727# capacity to be placed and at what spacing. My answer is (606*13/727)=11 bolts Spacing = (13*12)/11+1=13" o.c. Is it odd that the spacing being that close ? My...
  8. Henry94606

    Chord tributary weight

    In our architecture license study, seismic tests around flat roof building where we multiply the chord length x building tributary depth x 15lbs to get the chord tributary weight. Yet in wood frame reality there is the eave side (non roof bearing side) of the building. I wonder on this side...
  9. Henry94606

    Building tiedown negative value

    In calculate shearwall I had a long SW that resulted in tiedown value as negative. How should I understand this in layman terms ? After reduce the length of the SW, I had it a positive number. Wonder if at certain lengths, SW starts to yield negative tiedown value.
  10. Henry94606

    Panels

    I love this forum
  11. Henry94606

    Panels

    A. It s a student level question. C. It s irrelevant to the question.
  12. Henry94606

    Panels

    Hi forum. I am new, and I am an architect working mostly residential. I currently having a house with 200A main panel (with metter). We try to add another sub panel 125A for the house new addition (1000sf). My knowledge of electrical work limits to fill out the panel schedule with amperage and...
  13. Henry94606

    Building Weight

    Hi, I m trying to understand Bldg Seismic Effective Weight, BSEW, on a small 1 car garage 10x20x9'ht. I watched several YouTube videos and still unsure. A few questions: 1. In ASD calculation, that BSEW is the weight of the roof (15psf x 200sf) plus all perimeter walla weight (20+10)x2 x9ft ht...
  14. Henry94606

    Structure: under floor wood pier

    Hi Structure Engineers, I have question on the residential under floor pier that supports Girder and floor joist above...that I saw often in CA. What kind of Girder bracing here (sure it s Simpson Tie), should it be described, in tech term, "pin ?. Should the piers only be used as midspan...
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