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Purdueenginerd

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Everything posted by Purdueenginerd

  1. Purdueenginerd
    I'll let an architect comment and correct me on this, but doing my fair share of roof inspections for commercial office buildings I think I can explain.The energy code IECC requires a specific solar reflective index for the roof membrane. This is indeed for energy and temperature efficiency reasons. TPO roofs or Thermoplastic polyofin roofs are common roof membrane. Bituminous roofs arent dead though, now and days they coat them to meet the reflective values. If your really want to get into the weeds, heres a pretty decent explainer on 'cool roofs' by national manufacturer. (PDF warning) https://www.jm.com/content/dam/jm/global/en/commercial-roofing/brochures/RS-7651_Cool-Roof-Solutions.pdf
  2. Purdueenginerd
    I believe I saw a for sale sign a few weeks back at the old steel facility on the corner of 11th and Ella
  3. Purdueenginerd
    The center is probably going to have the shear wall and central lateral system for the building. This is normally going also hold the elevator banks. So consider the weight of the shear wall, your matt foundation might need more thickness to handle the shear loads. You're also going to need a depressed area (though not that much) for the elevator banks. Theres a couple of other reasons but without really getting into the weeds, i'll just explain, more loads, more concrete.
  4. Purdueenginerd
    Thanks!
  5. Purdueenginerd
    Is there a HAIF thread on the bottled blond? been trying to find some info on that project.
  6. Purdueenginerd
    Fun Fact: JFKs, "We Choose to go to the moon" Speech was given right in the middle of Rice Stadium
  7. Purdueenginerd
    Ah, perfect I stand corrected.
  8. Purdueenginerd
    So I was curious, I tried looking up the parking minumums in NYC and I found this https://nyc.streetsblog.org/2016/03/17/parking-requirements-will-be-reduced-in-a-huge-chunk-of-nyc/ it seems that there is, but only for publicly subsided housing, which is a far cry from Houston which has parking minimums for a broad spectrum of retail and multi-family residential requirements. I could be incorrect regarding NYC, so feel free to interject. I dont think NYC is a fair comparison however. Atlanta is similar to houston in terms of sprawl and recent growth in the late 20th century. It would appear they, among other US cities have parking minimums and are undergoing debate to reduce or remove them: https://www.cnu.org/publicsquare/2019/02/11/atlanta-zoning-update-addresses-parking-adus-missing-middle Looking at my googling, it appears that many US cities have (or had) parking minimums that were enacted in the 50s and 60's which likely coincides with the transportation engineering movement of the era: Sprawl.
  9. Purdueenginerd
    Yeah thats an elegant product. Youre right though, even on the structural engineering side we normally punt the guard rails to a 3rd party and its not even looked at until construction is well underway. Ive done handrails for industrial sites, but theres a few times here and there where I've had to design custom guardrails for architects, but surprisingly its difficult to get the look they want and comply with code requirements.
  10. Purdueenginerd
    Cool seeing the lateral deflection of the crane as they load up the counterweights. Kudos to the general contractor on this job, that rebar, formwork, and housekeeping seem quite good
  11. Purdueenginerd
    I believe there are code requirements on guardrails that prevent a 4" sphere from passing through the vertical posts. Often times you'll see the glass guard rails on these buildings but those are expensive. Perhaps they got value-engineered out?
  12. Purdueenginerd
    That lot is already mostly parking lot. Is this project a renovation or a brand new building? I cant quite tell.
  13. Purdueenginerd
    Thanks @Luminare for the call out! Everything you stated is correct Just to add, like many things it depends on the location of the crack, size of the crack and the type of crack. All concrete cracks. The curing process causes a volumetric shrinkage of concrete (more specifically the cement crack). There's ways to mitigate it. The rebar/steel is one way. Your concrete mix design is another. For large placements like a matt foundation controlling temperature might also be part of the plan. The reinforcement in a foundation for a high rise is so dense that its unlikely to get significant cracking, at least discernible cracking to the human eye. When I get called out to look at cracks in a structure, the crack pattern, location, if its planar or faulted, and its width can tell me a lot about the cause and what to do as an engineer. But to answer your question. not often will a crack force the engineer, architect, and owner to ask(or demand) the GC to start over, if the problem can be solved within reasonable engineering judgement. But lets say that Matt Foundation is just absolutely covered in cracks, 1 foot apart, all relatively wide. This would be alarming. And after a lot testing, finger pointing, analysis, and probably litigation, the contractor might have to start over. On the other hand if there was 1 small crack, 30 feet long, not faulted in that entire foundation. I'd say epoxy inject it and move on. Funny enough I had a project a couple of years ago where the contractor cast a lot of non-structural decorative concrete for some area paving; and it cracked quite a bit. It didnt comply with the architects contract documents so the contractor had to tear it out and start over. So... the answer is : it depends!
  14. Purdueenginerd
    This is definitely a site where you'd want 10' sidewalks, and it sort of looks like the standard 3' sidewalks. They might be waiting towards the end of the project to redo the sidewalks perhaps? That I actually like. With on street parking on Washington(though Im not sure if this area has it), its better to have the sidewalk right up against the road. The design philosophy of Street->3' uninterrupted strip of grass--> sidewalk is a suburban technique that forces street parkers to walk onto wet/muddy grass.
  15. Purdueenginerd
    Will be nice if the fill the block w/ good street presence. This thing still seems over 3-4 years away though.
  16. Purdueenginerd
    I'm not super familiar with temporary structures but I would imagine if theres a specific duration that the building will be there, it will still have to comply with IBC 2012 CoH Amendments (building code for Houston) The slab-on-grade with grade beams is going to be more durable than cinder blocks and like you commented, will probably look nicer.
  17. Purdueenginerd
    Thats a pretty light foundation actually. Grade beams and a slab on grade. Dont have any pictures showing drilled piers, but this foundation looks like something youd see for a residential building.
  18. Purdueenginerd
    I could be wrong as well as I have not seen the interior framing. But if I had to guess, I would opine that its steel frame for the center columns and beams to support the roof bar joists however the exterior perimeter appears to me to me tilt wall with a decorative finish. That tilt wall is likely supporting the other side of the bar joists. Those exposed aggregate tilt wall buildings were really popular in the 70's and 80's. Link below with some construction details on how theyre built. https://www.concreteconstruction.net/how-to/tilt-up-exposed-aggregate_o I pulled an image from 1978 from when the complex was under construction. Pretty hard to tell but it looks like the walls are up and theres no roof on the building(the Center building) yet which is consistent with tilt-wall construction.
  19. Purdueenginerd
    The architect isnt making the structural engineer's life easy on this one. Tilt Wall construction like that and it looks like theyre cutting huge holes in it and significantly altering building profiles. I get the feeling this might be scaled back significantly once it gets to the DD issue of the drawings. Neat complex though
  20. Purdueenginerd
    Thats good. Guess they have weekend and late night shifts working. Might explain why this building is going up so fast.
  21. Purdueenginerd
    Little bit of infill sandwiched between dense residential buildings. Should be good.
  22. Purdueenginerd
    I dont get it. Is it a naughty joke?
  23. Purdueenginerd
    In my opinion, I'm not a huge fan of 9 floor of garage space within that footprint. I get the idea that whilst looking for parking the driver will get dizzy driving up to the top.
  24. Purdueenginerd
    wow, a potential 600 footer for midtown.
  25. Purdueenginerd
    Labor is generally a lot bigger portion size of total construction budget than materials. Allocating 3 shifts a day, 7 days a week will for sure lead to a good chunk of the workers get OT pay, which drives up labor costs a lot. As for whether thats offset by the sooner profitability of the land owner is dependent on their loan, what theyre making money on, and how many tenants they have in waiting.
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