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Purdueenginerd

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Everything posted by Purdueenginerd

  1. Purdueenginerd
    Well, I looked at the photos. It could be steel. I thought the metal framing studs were only offered in aluminum. But they got it in steel as well http://www.menards.com/main/building-materials/metal-framing/c-5695.htm My Apologies.
  2. Purdueenginerd
    The framing looked like aluminum to me. The studs and everything were that way as well. No way its galvanized steel frame. Overtly expensive with no reason to galvanize it (its not exposed to elements). Stainless steel would be even more expensive, and weaker. Stainless steel has a lower yield strength than carbon steel. I'll go back to the photos later, but I'm pretty confident it was an aluminum frame structure.
  3. Purdueenginerd
    Event then, Body Belt fall arrest systems have been unnacceptable for fall arrest systems since like the late 90s for a couple of reasons why. When you fall, you accelerate quite quickly, the fall arrest system today are roughly designed for 5000 lbs of force. Thats not to say, that you weight 5000 lbs, you'll be safe. It means, that the force applied by a 300 lbs person falling 4-6 feet and stopping within a foot or two, will apply several thousand lbs of force to the arrest system. Body belts, are banned by OSHA (there are exceptions and this isnt one of them), because an inverted fall with 5000lbs of force on the arrest system will basically rip the belt down your legs or up your torso, and you die anyway. The other reason they were banned is because was if the body belt performed as such, it put incredible amount of stress on the hip bones, breaking the hip bones--- it also, could effectively annihilate internal organs with the equivalent of a 5000 lb punch to your stomach region. The recoil of a grown adult slamming his/her knees into their face at that velocity would knock most people unconscious, and it was determined that while many belts saved people from going splat on the pavement, their hanging position and injuries sustained by the belt they'd be dead within a minute from asphyxiation They should have a 6 point body hardness, at a minimum doing the work they're doing. Someone mentioned contacting the GC or owner of this project. I would encourage that. Either those guys are being knowingly reckless, or management is trying to cut corners on the backs of labor. https://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=NEWS_RELEASES&p_id=1078 https://www.osha.gov/Region7/fallprotection/fall_protection_info.html
  4. Purdueenginerd
    I like how they enclosed the old emergency stairwell with that orange cladding.
  5. Purdueenginerd
    I'm sure, at a minimum he had an employer provided one. That being said, I would hope the owner of a business property would be prudent enough to pull a life insurance policy for himself, but we dont really know in the end.
  6. Purdueenginerd
    I'm surprised theyre letting those vertical bars cantilever that long without support. Very nice pictures.
  7. Purdueenginerd
    Aluminium framing for the support structure! They can be a little heftier with their architectural details.
  8. Purdueenginerd
    lol why even make a rendering of that?
  9. Purdueenginerd
    Wow. just wow. Just sent out my safety e-mail today at the office.
  10. Purdueenginerd
    Fantastic. I'd imagine a whole foods near there would encourage more development, Elgin street between Smith and Brazos is the site of the old Social Security office if I'm correct. This should be a big boom for development and retail in that area.
  11. Purdueenginerd
    Triton, I wonder if we've ever cycled by eachother in the past. I always see on Strava all the riders that I pass. I did about 45 miles this weekend. Perhaps you were out there as well.
  12. Purdueenginerd
    http://swamplot.com/why-superblock-construction-is-moving-superslow/2015-05-04/ Swamplot with an article on this. THis doesnt smell right either. Construction Costs?! I dont buy it.
  13. Purdueenginerd
    agreed, and I apologize for kind of introducing it as an example.
  14. Purdueenginerd
    Deep Breath. /Sigh Nonenadalize clearly never took a Highschool physics. W=∫Fdx W = ΔE KE=1/2 mv^2 ΔKE=∫Fdx Where F=Impact force, W equals Work, E equals Energy in a system, KE is Kinetic Energy. Your homework, tonight is to estimate the mass of 10 floors. Moving, 12 feet due to gravity, and determine how much force is applied. When you do that: Find me a construction material on this planet that can resist that kind of energy and force.
  15. Purdueenginerd
    Those demolition photos are a little sad.
  16. Purdueenginerd
    Hope youre joking but I do get this question a lot. The answer is no, But it doesnt have to. It also changes the coefficient of thermal expansion for steel as a function of temperature. I wont get into the material science of steel transitioning from solid to liquid, and how thats not an instantaneous occurance . But if you truly want to read about how temperature affects steel members. Go to AISC (American Institute of Steel Construction): Steel Construction Manual and refer to the equation on 2-31. This equation will give you the coefficient of thermal expansion for steel from 100 to 1200 degrees F. From that, you can calculate, how much a member will 'grow' under a given temperature, which puts new stresses on the connections. PDF would be too large to provide here, and its about a 500 dollar design code. Then, go to AISC Design Guide 19: Fire Resistance of Structural Steel Framing Link (Pdf): http://portales.puj.edu.co/wjfajardo/ESTRUCTURAS%20MET%C3%81LICAS/AISC/AISC%20Design%20Guide%2019%20-%20Fire%20Resistance%20Of%20Structural%20Steel%20Framing.pdf Go to Table X.1 on Page 70 of the PDF and you'll see that steel starts to lose yield capacity at around 800 degrees.
  17. Purdueenginerd
    They'd rename it, Century Tower!
  18. Purdueenginerd
    Love that shot!
  19. Purdueenginerd
    Not to start an argument, regarding WTC, thus I apologize to everyone else. But you are very incorrect. Please see attached images of WTC during construction for what is clearly the structural core. I would suggest reading the NIST reports in regard to the structural analysis and failure mechanisms of the WTC towers. They talk about the original calcs, original drawings, the load analysis, and likely and confirmed damaged support columns. http://www.nist.gov/el/disasterstudies/wtc/wtc_finalreports.cfm Edit: Fair warning, some of the PDFS on the link are over 60 mb. Its been a few years since I read through them all, but if youre into structural analysis and failure analysis its a good read.
  20. Purdueenginerd
    Those cores/elevator shafts encompass a large portion of the shear and lateral resistance of the structure, making the structure stiffer and less likely to laterally move significantly during seismic or wind events. They can also allow for larger 'floor plates' uninterrupted by support column which can be beneficial for apartment or office units. One of the more famous examples of a skyscraper with a large core is the World Trade Center towers before 9/11. Edit: Some light reading http://www.purdue.edu/newsroom/research/2011/110920BowmanSkyscrapers.html I used to work at this lab when I was an undergrad on the project listed above, very early in the research project (2007-2008).
  21. Purdueenginerd
    Whats up with the 3rd photo-- Armageddon Filter for instagram??
  22. Purdueenginerd
    Had Jury Duty on Monday. This is from the 20th floor of the Criminal Courthouse Obligatory Skyline Shot.
  23. Purdueenginerd
    According to swamplot theres fencing going up around the site.
  24. Purdueenginerd
    Very nice. For what its worth, that is a water cooled core drill rig. Often used for extracting concrete samples with diamond drill bits. . If you look it the wheel barrow closely, they already have a big ole' concrete core. Looks like 10'' or 12'' Diameter.
  25. Purdueenginerd
    You can see the old RoW for the rail line that used to run through there (see the weird segment for the property lines). Cool stuff.
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