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  1. structural3

    tilted floor in hillside house

    "Leveling the Second Floor by adding another plate under the Second Floor joists..." will be expensive fix. I was proposing a cheap fix (definitely not a perfect one) by adding 2x flat on top of floor joist as long as you don' have door/opening near these area.... There is no pony wall at crawl...
  2. structural3

    tilted floor in hillside house

    Assume the leveling problem is caused by wood shrinkage, I don't think it will be a cheap fix too. If we put 2-2x flat on lower side of 2nd floor level and install plywood above, the problem shall be solved. what do you think of this solution? Janet
  3. structural3

    tilted floor in hillside house

    Thanks for your valuable comments. Please explain why there are "3 plates below and 3 plates above the 1st floor". The total number of plate on stud wall line 3 below 2nd floor level is only 4, therefore the no. difference is only 4-1=3, with 3x3/8+3/4, I only get 1.125" please explain where...
  4. structural3

    tilted floor in hillside house

    Remember this is a upsloped house, not downsloped one. The lower level stud walls are sitting on street level, therefore, it can not persuade me that the house will slide down. Because the middle potion of the house is supported by concrete stem wall close to the sloped edge, so if the house...
  5. structural3

    tilted floor in hillside house

    This line is the line of masonry stem wall I mentioned which is sitting near the top of high side of sloped grade, I agree with you that you think it may slide down as section shows too close to the sloped grade, but the top of floor joist does not drop down that much at all at higher grade...
  6. structural3

    tilted floor in hillside house

    The soil in this area is typically good. (correct my previous post, there is no bedrock base under, it's only soil). No foundation cracks were observed as I mentioned, there is only less than 1" drop in both directions between 20' distance on top of garage stem walls. For this kind of problem...
  7. structural3

    tilted floor in hillside house

    See section too. I pretty much know the retrofit method, just wondering if this condition is a concern, it may not be a big deal and it is not necessary for retrofit, All I need is field person/contractor's...
  8. structural3

    tilted floor in hillside house

    ok. I thought it's easy to type a layout, but since you mentioned scanner I will attach the more professional one here. I have never load pictures here, so not sure how many pictures I can load up. Yes, I am an...
  9. structural3

    tilted floor in hillside house

    Sorry don't know how to delete the previous post, but this layout works. Garage size is 23'x21'. 51' aaaaaaaaaaaaaaaaaaaaaaaaaaaa grid 1 a a a 2nd floor a 18' a...
  10. structural3

    tilted floor in hillside house

    I went back did more measurement accurately and had some concern and questions. The main concern is there is a 3 inche drop from grid line 2 to line 3 (13' distance) it seems too much. I included house layout in this post. a)all floor joists run up and down assuming north is up b) grid line 1...
  11. structural3

    tilted floor in hillside house

    I am checking a house which is sitting on a sloped lot. Assuming you are facing the house, the front left side is two car garage and right side is downstair entry leading you to a living room. All the rest of the rooms are located upstair, one the back side of garage there is a door which leads...
  12. structural3

    wood truss for lateral resistance in high seismic zone

    The title shall be change to Lateral Reistance System for Wood Building located in high seismic zone. If you are familiar with the code the post won't be so long as you read. Please make comments especially from people in California.
  13. structural3

    wood truss for lateral resistance in high seismic zone

    We are working on a project where the building needs to be evaluated due to the crane upgrade, assuming that crane load will be increased from 50 ton to 80 ton, the building was built back in 1940s and have span of 2x80' span (2 bays in tansverse direction), building heigth is about 60' and roof...
  14. structural3

    Thick Footing at Heavy Machine (No impact - High Deflection Control)

    As I mentioned, deflection criteria can not be met using pile system at this time. (Too much differential settlement) Assume the deflection restriction to be reduced to be 10^-3inches, for me, the precision is still far beyond the anticipated tollerances of general civil-structural works, let...
  15. structural3

    Thick Footing at Heavy Machine (No impact - High Deflection Control)

    It's differential deflection (due to tilt etc. while operating to equipment) that we are concerned about, not overall settlement. ToadJones, how much rebar are you putting in the foundation?
  16. structural3

    Thick Footing at Heavy Machine (No impact - High Deflection Control)

    steve1, How thick is your mat foundation, as I estimated, if thickness is less than five feet, it's legible to model by Risa as four noded element, once the width/depth ratio (element width, les assume is 5', that means depth can not exceed 5'), I don't think it can be defined as plate, instead...
  17. structural3

    Thick Footing at Heavy Machine (No impact - High Deflection Control)

    ishvaaag, Can you elaborate what you recommended as follows, especially about thermal effect. the machines is sitting inside of the building and is located in California w/o extreme weather condition. Please recommend a good reference to a structural engineer to handle this situation. Thanks...
  18. structural3

    Thick Footing at Heavy Machine (No impact - High Deflection Control)

    I agree that problem may not be achieved by specifying thick foundation, but at this time I could not find a better way to achieve the goal to meet vendor's high deflection criteria. (Please recommend another way if are are aware of it) As structural engineer, the typical way we handle...
  19. structural3

    Thick Footing at Heavy Machine (No impact - High Deflection Control)

    I need help to design a thick foundation to control equipment deflection, I understand that there are a lot of publications covering dynamics support design, but in this specific case, the impact load is very minimal from machine, and vendor specifies 10^-6 order of magnitude accuracy (in...

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