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  1. EngineerofSteel

    Design Rules for Pan Deck?

    I am designing a small winery building. It will be 40x80, with an underground storage area. My question is: PAN DECK engineering- how does this work? I have some heavy point loads- moving, loaded, forklift; fermenting vats (near edge of deck) and an estimated 20 tons of grapes each harvest...
  2. EngineerofSteel

    Tilt-up walls on 1960's building leaning out

    I have a package to bid on repairs to wood trusses on three wharehouses. A previous engineer designed repairs to the trusses. I generally like what he did. But, I noted that he did not address a lack of lateral bracing on the trusses. My main concerns are these: 1. One of the buildings has...
  3. EngineerofSteel

    wind column footing seems large

    Designing a footing for a wind column The wind column is 15" c/c from the column of a center frame for a 50 x 50 PEMB. The building company gives P = 42.8K for DL + RLL for the frame column For the wind column, P = 43.0K and the moment generated is 66.8K After working on this, I came up...
  4. EngineerofSteel

    Accomodating Recent Increase in Earthquakes

    How are you accounting for the global increase in seismic activity? Earthquakes have increased. Has anyone modified their design procedures to account for the increased probability of seismic events? I am being extra cautious in considering building design, and especially connections. I've...
  5. EngineerofSteel

    ?Causes of flashing buckling on new roof?

    I'm invited to look at a new roof, recently installed by a large, experienced contracting firm. For some unknown reason, the flashing is "buckling". I have not seen this before. What are some of the potential causes? pre-manufactured trusses, 24" o.c., 5:12 pitch, 40-foot span We have had a...
  6. EngineerofSteel

    How to handle shear in a 3-wall Commercial Building?

    I have just never learned how to handle this: I have an existing building, 36x30.5, with 10' walls. The existing frontage wall of this commercial building will be remodeled to be all windows. There are only 2 small full-height sections of wall flanking the entrance door. Basically, there is...
  7. EngineerofSteel

    pin condition for rafter attached to carrier beam

    A column is removed from one frame. To support the rafter, the missing column is replaced by a carrier beam spanning between the the columns in the same place in flanking frames. What type of connection is this? The beam will deflect, whereas the column would not. We will use a small shim...
  8. EngineerofSteel

    definition of "ground supported" storage tank per AWWA D100?

    I designed a water storage tank for a milking parlor. It is vertical: diameter= 11ft 9in height = 26 ft I used ASCE7-05 Section 15.7.6.1 "Ground Supported Storage Tanks for Liquids" part a says "The base shear and overturning moment calculated as if thank and the entire...
  9. EngineerofSteel

    Horizontal Bracing at top of Pratt bridge?

    I am designing a short, 35'8" span Pratt bridge (4 @ 9'). Simple enough. But, I am unable to locate the engineering standard for the strength requirement of the horizontal bracing at the top. photo of a Pratt truss bridge (also 4 section) is attached. I am asking about the X-bracing which...
  10. EngineerofSteel

    How to calculate probabilistic MCE?

    The county engineer is asking for a complete soil investigation report per 2007 CBC (IBC 2006, pretty much), chapter 18, section 1802.2.7 The permit is ready to be issued. 1802.2.7 has this exception: no study is required provided that peak ground acceleration is equal to SDs/2.5 is used. SDs...
  11. EngineerofSteel

    How to calculate probabilistic MCE?

    The county engineer is asking for a complete soil investigation report per 2007 CBC (IBC 2006, pretty much), chapter 18, section 1802.2.7 The permit is ready to be issued. 1802.2.7 has this exception: no study is required provided that peak ground acceleration is equal to SDs/2.5 is used. SDs...
  12. EngineerofSteel

    Do wall braces obviate wind force into column design?

    Designing a simple frame, using RAM Advanse, I put the wind loads onto the walls... Then, I design wall braces. I inherited this process from my predecessor. However, I looked at another engineer's calcs. There are no wall braces. Looking at PEMB calc reports, I see the forces moved into...
  13. EngineerofSteel

    minimum footing requirements for shear wall?

    I did calcs for a long building which required existing hallways to be upgraded to 1-hour fire resistance. Since these walls were being re-paneled anyway, I used the shear resistance to qualify the resisting capacity of the building. The walls sit on a 4" slab. The entire slab is...
  14. EngineerofSteel

    How does a Blocking Panel distribute load?

    I have a roofing remodel project. Two existing buildings are perpendicular to each other. They have flat, built-up roofs. The owners are re-roofing with 4:12 trusses. The new trusses will overhang an additional 5 feet past eaves. There will be one continuous roof covering both buildings...
  15. EngineerofSteel

    Wood walls and CMU walls in same building

    I have an architect friend who sends me projects. He drew a commercial building, 2-story, 115'x22'8". The north and east walls are uninterrupted CMU. The south and west walls are light-frame shear walls- with many windows. I don't like the design. Here are my concerns. Please comment- I...
  16. EngineerofSteel

    Water loss in a storage pond

    A dairy pumps water into a large lagoon. Typically, the pressure head averages 10'. Currently, they lose a lot of water due to permeable soil at the base. They want to empty the lagoon and emplace a clay liner. Soil samples have been sent, and a K value is requested from the lab. My task...
  17. EngineerofSteel

    Minimum number fo hold downs per shear wall?

    I have a two story building with a balloon frame, 22' high. The wall is attached solidly to the main building and has a height:width ratio of about 1:1.15 The tile roof anchors the wall against uplift and calculations do not require a hold down. However, is there a minimum requirement for...
  18. EngineerofSteel

    Shear walls too long?

    I was surprised recently to receive this comment in a review letter. It was not listed with the 9 items for correction, but in a summary paragraph at the end. Here it is, verbatim: "There are a couple of walls 20'+/- that do not meet aspect ratio along with several of the 10' walls." I am well...
  19. EngineerofSteel

    maximum heights for wall studs?

    What is the max height for a wall stud? How high can a shear wall be using 2x6's? A man wants to remodel his family room, increasing the wall height to 19' from 10'. Currently, he has 2x6 DF#2 studs @ 24" o.c. Where is this ratio limit in the UBC?
  20. EngineerofSteel

    wind load exception in IBC?

    In the UBC, ag buildings had an exception. They could be designed for dead + live only. Wind could be ignored. Is there any such exception in the IBC 2006 or CBC 2007?

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