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  1. DCStructures

    Anyone have experience doing structural site surveys for subway systems?

    Considering taking on this work. Interested to hear feedback. Thanks.
  2. DCStructures

    2x8 roof rafters, adding collar ties

    Any tips on strengthening 2x8 roof rafters? Collar ties currently exist on every 4th rafter. I'm thinking that adding collar ties at every rafter could easily increase capacity. Any tips? Suggestions? Warnings? Cautions? Thanks in advance.
  3. DCStructures

    PV panel system attachment to masonry parapet

    I have a solar contractor client who wants to attach their PV panels to the masonry parapet of a row house through a system in which ultimately the wind uplift load is applied to the parapet by way of threaded rods which are drilled horizontally through the parapet. The height of the parapet...
  4. DCStructures

    Timber roof trusses

    I'm doing some work on an existing building with timber roof trusses. I have never seen a truss with this configuration or these types of connections before. (See attached photos.) Has anyone seen these before...
  5. DCStructures

    Metal base for sculpture - questions about sizing & anchoring

    I am designing a base for a 6ft tall x 5ft wide x 1/2in thick sculpture that is to be located outside in a plaza for 1 year. The artist prefers to use aluminum for the sculpture itself, but is open to using stainless steel if it's preferable structurally. We are not allowed to attach the...
  6. DCStructures

    Aluminum plate + stainless steel bolts + exterior condition = how much corrosion in one year?

    I am designing a base for a sculpture. The artist would prefer that the base be stainless steel, the sculpture be aluminum, the connecting plate (between the sculpture and the base) be aluminum, and the bolts (between the connecting plate and the base be stainless steel. This is a temporary...
  7. DCStructures

    Aluminum design software or spreadsheet

    Similar to an old thread (thread507-269726), does anyone have or know of a good (inexpensive) software or spreadsheet for aluminum design? I'm trying to design a simply supported beam, but it's proprietary aluminum shape. And I am not as familiar with aluminum design as I am with steel...
  8. DCStructures

    Determining timber species and grade

    I'm working on some existing row houses. They have typical rowhouse layout with timber beams and masonry walls. I can measure the timber beams but there is no indication of the grade or species of the beams. I need to verify the capacity of these beams. Is there a rule of thumb or general...
  9. DCStructures

    Simple Wood Truss Analysis in RISA3D

    I'm checking some existing wood roof joists for added weight of solar panels. I built a simple RISA3D model, but it's not giving me good results. The solar panels are only 2.7psf and the building is fairly new construction (<2 yrs old), so I don't really think there is much concern with the...
  10. DCStructures

    Underpinning, new beams pocketed into existing walls, rowhouse

    Hi all, Working on a basement renovation of an existing rowhouse. New steel beams will replace intermediate lally columns. Was originally going to support new steel beams on new steel columns at perimeter, but cost of steel/connections/foundations becoming a problem. Alternatively, if I...
  11. DCStructures

    Best way to gain knowledge in residential renovation &amp; repair

    Hi all, I'm looking for some feedback on what is the best way to gain knowledge in residential (one- and two-family small) renovation & repair. I was hoping to find a more senior structural engineer with experience in this sub-field to be an "apprentice" to, or something like that. However it...
  12. DCStructures

    Steel fabrication details

    For a small residential project, who would typically carry out tasks such as punching bolt holes in steel beams and shop welding cap plates and connection angles to columns? I assumed fabricator, but architect seems to think it'll be sub-contractor. Or are we both wrong?
  13. DCStructures

    New column footing right next to and partially supported off of existing masonry wall footing

    I'm sizing a footing for a new steel column located next to an existing masonry basement wall. The new column needs to be as close to existing wall as possible (allowing space for base plate). Foundation of existing masonry wall is unknown, but assumed to be continuous wall footing made of...
  14. DCStructures

    Lateral stability for steel framing

    I'm working on a small renovation. Adding a couple steel beams supported on new steel columns which will be (located at perimeter of room) to replace existing posts (located in middle of room) and create open space in basement. I need to provide some lateral stability to this new framing and...
  15. DCStructures

    Residential Renovation - Structural Questions

    Hi all, Working on a residential renovation project that has me coming up with lots of questions. Long story short, it's a 3 story brick, wood framed row house with existing basement, built early 1900's. Floors are deflecting slightly at all levels, likely due to age. There are currently...

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