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  1. CEmonkee

    Allowable Story Drift - ASCE 12.12-1, footnote c

    Thanks r13 [smile]
  2. CEmonkee

    Allowable Story Drift - ASCE 12.12-1, footnote c

    Hi - I have a question about the allowable story drift in ASCE 7 Table 12.12-1. Footnote c has the following: There shall be no drift limit for single-story structures with interior walls, partitions, ceilings, and exterior wall systems [highlight #FCE94F]that have been designed to...
  3. CEmonkee

    Shearwalls - vertical/horizontal offset combination

    I'm rethinking how I am breaking the diaphragms up... I found this thread today: thread507-462591 It gave me the idea of taking out the strut force between the two walls on either side of the center roof and distributing it to the two perpendicular walls (as was discussed in the thread I...
  4. CEmonkee

    Shearwalls - vertical/horizontal offset combination

    I now have a better idea of how the roof will be framed. Below is a plan view of the house – the thick red lines are possible shearwall locations, the yellow dashed lines are where trusses are located that I plan to use as drag struts. As I noted previously, the roof in the front of the...
  5. CEmonkee

    Shearwalls - vertical/horizontal offset combination

    Okay, I think I'll start with that. I may have some more questions once I get further into the analysis. Thanks for your input so far, I really appreciate it!
  6. CEmonkee

    Shearwalls - vertical/horizontal offset combination

    Here is the full outline of the building with more detail... I'm thinking it would be easier to break it up as shown below...
  7. CEmonkee

    Shearwalls - vertical/horizontal offset combination

    Hi retired13, I suppose I could do that. What do you think of breaking it into 3 separate diaphragms?
  8. CEmonkee

    Shearwalls - vertical/horizontal offset combination

    Thanks for your reply BAretired. Does the sketch below depict what you're describing? One issue - the shearwall on the right side (labeled SW3 in the image I attached in my initial post) has a window in the center and the side segments have aspect ratios of 3.6:1, so I can't use it as a...
  9. CEmonkee

    Shearwalls - vertical/horizontal offset combination

    I have a question on a 1-story wood frame house that has a center section that is vertically and horizontally offset from the adjoining sides. Please see the attached figure (the image on the left is an isometric view of the house, the center image is a plan view of the roofs and shearwalls, and...
  10. CEmonkee

    Wind loading on irregular structure

    I think I agree - Ch 28, part 2 should not be used. Thanks for your opinion, I appreciate it. I may have further questions once I start calculating the loads (I mostly use part 2, so I need to brush up on the other method).
  11. CEmonkee

    Wind loading on irregular structure

    Wind often controls here.... I would like to just calculate the pressures assuming a regular shaped building, but the paragraph I quoted from Malone's book made me question whether I should do that. I'll look into using the directional procedure if it's easier to setup a spreadsheet for that...
  12. CEmonkee

    Wind loading on irregular structure

    Thanks Simba13 - I bought the Kindle version of that book a few days ago, it's a great book. In section 2.3 it has the following regarding the calculation of wind loads: 2.3 Load Distribution into a Diaphragm IBC Section 1609.1.1 allows the determination of wind loads to be in accordance with...
  13. CEmonkee

    Wind loading on irregular structure

    I am working on a 1 story house with a roof that is vertically offset at the center (please see the attached image). As you can see in the plan view, there are also some horizontal offsets. For the wind loading, I would prefer to use the envelope procedure, part 2 of ASCE Chapter 28 since that...
  14. CEmonkee

    Adding on to an existing structure (wood frame construction)

    Hi Mike - I don't think the client will want to go to the expense of bringing their entire house up to code... Is there a good source for construction details for adding on to a home and keeping it structurally separate from the existing building? I can analyze the new addition for wind and...
  15. CEmonkee

    Adding on to an existing structure (wood frame construction)

    Hi All - Thanks for your replies and suggestions, I appreciate it. I will probably have addition questions once I make a site visit in a couple of weeks.
  16. CEmonkee

    Adding on to an existing structure (wood frame construction)

    I’ve been contacted by a potential client about doing the engineering for an addition to their home. I have not yet made a site visit, but I know a few facts: (1) The house is single story and built prior to 1950. (2) The construction is wood, the foundation is post and block. (3) The roof is...
  17. CEmonkee

    Wind loading question

    Hi AELLC - thanks for your reply. I agree on the hangers - not a good idea. I was looking a little further into the possibility of taking the chord forces out in the building (so I wouldn't have to embed the outside posts). On one side there is a bearing wall that also serves as a shear wall...
  18. CEmonkee

    Wind loading question

    Okay... I don't think I mentioned that the porch roof is framed with scissor trusses. As far as I know there was not a plan to sheath the underside of the trusses. Also, I just found out yesterday that the contractor was planning to hang the beams on the outside wall (with hangers), instead of...
  19. CEmonkee

    Wind loading question

    Since the Simpson post bases I was going to use out at the front of the porch do not provide lateral capacity, I'm thinking it might be a good idea to add some knee bracing out front... So I would span a beam that runs parallel to the house between the posts, and then put the knee braces between...
  20. CEmonkee

    Wind loading question

    Hi AELLC - I looked over your detail for the outside post. That would work, however the client wants to use glulam columns, so I'm looking at using a Simpson PBS66 post base (see attached PDF).http://files.engineering.com/getfile.aspx?folder=b73f349b-0642-4e36-af5f-30878eda980d&file=C-2013-p058.pdf

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