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  1. BubbaJ

    Buttress Vs Car

    Currently have a repair project where a late 19th century stone buttress took on a car and lost. I was amazed they still had the original drawings. There is a plaster crack in the corner on the interior, otherwise no other damage observed on the first floor or in the basement. The...
  2. BubbaJ

    Parking Garage Dbl Tee/T Beam Joint Leaking

    I have a small 2 level parking garage (1975 vintage) that has a leaking problem (go figure), one level is slab on grade (access via the alley), the other is elevated and accessed via the street. Dimensions are approximately 200'x118' two spans of 24" double tees slope to the center of the...
  3. BubbaJ

    Winding up a 2 person firm

    My firm has been in business for almost 19 years and I'm planning to retire in 11 months. My business partner is not so lucky and will need to keep working for a few years yet. As we are not the same discipline, there is no sense in them "buying me out". As I have read in several other posts...
  4. BubbaJ

    No lateral load path - blocking missing above top plate

    Before I deliver some bad news to the contractor, I wanted to reach out to the group to see if there were any other options to explore. The framer took it upon themselves to ignore the drawings and the inspector noticed. Which is good, because there is no longer a continuous load path from the...
  5. BubbaJ

    Do you need a PT sill if you use a sill seal product?

    Code indicates that wood in "direct contact" with concrete "shall be of a naturally durable wood or preservative-treated wood..." If a sill seal product was used, the sill is technically not in direct contact with the concrete. Is the sill seal adequate protection in the eyes of the Code...
  6. BubbaJ

    Wood Floor Truss with Damaged Plates

    Came across this repair while reviewing an existing structure with areas of excessive floor deflection. Several floor trusses have this repair, some have 2 screws per web. I've only used plywood gussets to repair damaged metal plate connectors. It would seem that this screwed connection would...
  7. BubbaJ

    Selective Demo - Concrete Columns

    A concrete building will experience selective demolition. The lowest floor will remain intact. Aside from being troublesome to cut the existing columns off flush with the remaining concrete slab, can you see drawbacks to this. What if they come back later and rebuild? I was considering...
  8. BubbaJ

    Open Web Steel Joist vs the Derecho

    Hello from wind ravaged Iowa, I am starting to get calls to review wind damage in our area. The building I looked at today had some interesting damage. The bottom chord of the open web steel joists was kinked between the rows of bridging. Bottom chords braced at 1/3 points do not like being...
  9. BubbaJ

    Belfast truss reinforcing

    Client has a 60ft span Belfast truss with a 7ft rise. Not a system a lot of people are familiar with, took some digging on my part to identify it. (see attached) The building was built circa 1918. The trusses bear on top of columns with beams supporting shed roof framing on both sides. About...
  10. BubbaJ

    Multi-wythe brick wall support during lintel replacement

    Building was constructed in 1882, two-story 12" multi-wythe brick bearing walls. The wood lintels are severely deteriorated and need to be replaced. They are/were comprised of (8) 2x10s. You can see from the photo that the wood lintel (what's left of it) is continuous under all the bearing...
  11. BubbaJ

    1870s construction - arched rods at column

    Renovating an 1870s era building. The beam on the right is severely deflected, more than 4" and needs reinforcement. The roof joists are face nailed to the beam so options are limited to the bottom of the beam. I'm thinking a new steel beam to carry all the load and assume the deflected wood...
  12. BubbaJ

    Interpretation of ACI 318 Section 16.5.1.3 (C)

    I have a situation where the contractor did not install the embed plates in the foundation wall for the connection of the precast concrete wall panels and I am trying to work out a post-installed solution. The wall panels carry a light lateral load and are not load bearing (there is a...
  13. BubbaJ

    PT conc slab analysis without drawings

    I have a client who wants to put a large piece of equipment on a 2-way PT elevated slab in a hospital. The only information I have is an X-ray of the floor locating the strands. Anyone have any ideas on how to proceed with an analysis? I posted this in the PT forum also. Thanks.
  14. BubbaJ

    Modeling holes in diaphragms

    How do you model a hole in a floor diaphragm for a stair or elevator shaft? Is this accomplished by merely detaching the joints around the hole from the diaphragm? Or is it not necessary as there is no framing in the hole to transfer forces?
  15. BubbaJ

    1920s concrete beam analysis - working stress design

    When analyzing an existing structure for new loads, where the original design was "working stress" with the allowable working stress of the concrete reinforcing steel at 16ksi, how would you convert that to a value that could be used with strength design and factored loads? Or would the more...
  16. BubbaJ

    Missing Anchor Bolt Repair

    Despite the shop drawings indicating that only select columns could have the anchor bolts epoxied, the contractor left them out of all the pile cap pours, save one. Unfortunately, with the tension and shear at the base of the columns, epoxy anchors will not work as a "replacement" for the...
  17. BubbaJ

    building modeling - tension ring (roof w/cupola)

    I am trying to model a square building (basically a large enclosed gazebo) with hip roof (vaulted ceiling) and a cupola. The top of the roof structure (at the cupola) has a compression ring (multi-ply LVL) and the bottom of the roof (at the eave) I have another large multi-ply LVL continous...
  18. BubbaJ

    Very shallow grade beam on micro piles in cold climate

    Project is a wood framed structure in a cold climate. Due to subterrainian constraints and environmental considerations, we cannot excavate a continuous footing to 42" frost depth. Proposed detail is to provide a 12"hx22"w grade beam supported on micropiles (depth to be determined.) The...
  19. BubbaJ

    Cracked gypsum underlayment

    I am currently investigating a project where the gypsum underlayment has cracked. It was installed on the 3rd-floor of an existing 60 year old structure, over a cast-in-place concrete slab & joist system. The thickness is around 3/8" and has been topped with an epoxy coating. Some of the...
  20. BubbaJ

    Initial Deflection - Composite Wall Panels

    I am looking for information on initial deflection of composite precast-prestressed insulated concrete wall panels (in-place deflection due to self-weight.) Much of the research I have done shows an assumed value of 0.5" with no differentiation for various panel heights and no reference to how...

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