tag:blogger.com,1999:blog-2970975545475697571.post1249597889879009132..comments2024-03-28T03:57:20.041-04:00Comments on Eaton Rapids Joe: Little details add upEaton Rapids Joehttp://www.blogger.com/profile/09102166969915526172noreply@blogger.comBlogger7125tag:blogger.com,1999:blog-2970975545475697571.post-51636075988275717912020-05-15T17:05:20.162-04:002020-05-15T17:05:20.162-04:00New restaurants are nature's mechanism for sep...New restaurants are nature's mechanism for separating heirs from their parent's money.Eaton Rapids Joehttps://www.blogger.com/profile/09102166969915526172noreply@blogger.comtag:blogger.com,1999:blog-2970975545475697571.post-40540445200680634422020-05-15T14:33:39.149-04:002020-05-15T14:33:39.149-04:00Very high cost for a small amount of additional fl...Very high cost for a small amount of additional floorspace for a short season. And not a lot of profit in food service anyway. Not a viable project from the looks of it. ---kencoyoteken48https://www.blogger.com/profile/06182514695395380561noreply@blogger.comtag:blogger.com,1999:blog-2970975545475697571.post-80472608992847679742020-05-15T13:45:31.888-04:002020-05-15T13:45:31.888-04:00I found a detailed analysis here: https://www.engi...I found a detailed analysis here: https://www.engineering.com/Library/ArticlesPage/tabid/85/articleType/ArticleView/ArticleID/175/PageID/199/Default.aspx<br /><br />and overview here: https://interestingengineering.com/understanding-hyatt-regency-walkway-collapse<br /><br />Lots of errors in design going back to the original thru-rod version.<br /><br />Yet another teachable moment on why Engineering is HARD!Rick Thttps://www.blogger.com/profile/04748076795783834112noreply@blogger.comtag:blogger.com,1999:blog-2970975545475697571.post-51140454620461924262020-05-15T13:07:09.772-04:002020-05-15T13:07:09.772-04:00I remember seeing a documentary about the C channe...I remember seeing a documentary about the C channels. The channels were placed flange to flange instead of back to back. Probably to accommodate the change in fastener style.FredLewershttps://www.blogger.com/profile/02221076803807309775noreply@blogger.comtag:blogger.com,1999:blog-2970975545475697571.post-80845698141316649952020-05-15T12:59:41.088-04:002020-05-15T12:59:41.088-04:00I remember that disaster. The threaded rod was sup...I remember that disaster. The threaded rod was supposed to be continuous and to engage both top-and-bottom surfaces of the box section.<br /><br />The fabricator decided to take a shortcut. They welded nuts inside the box section and threaded the rod into the top an inch or so and then had a second rod thread into the bottom one.<br /><br />So the top box section not only was carrying its own load with just one nut, but all the load from lower mezzanines also passed through that nut and horizontal section rather than being carried by the rod in tension.<br /><br />The box section had been fabricated from a couple of channels that had been welded together flange of two "C" channels to make a box. The nut pulled through flanges.<br /><br />There were a half dozen minor modifications that could have been executed to avoid the tragedy but none of them were done. My biggest take-away is that an engineer who comes up with a design that is very, very difficult to execute is culpable when the guys at the job-site take a few, invisible short-cuts.Eaton Rapids Joehttps://www.blogger.com/profile/09102166969915526172noreply@blogger.comtag:blogger.com,1999:blog-2970975545475697571.post-64851855897096863262020-05-15T12:07:48.020-04:002020-05-15T12:07:48.020-04:00Yep, and it will be interesting to see if they get...Yep, and it will be interesting to see if they get it done correctly...Old NFOhttps://www.blogger.com/profile/16404197287935017147noreply@blogger.comtag:blogger.com,1999:blog-2970975545475697571.post-54148584679537450752020-05-15T11:12:55.658-04:002020-05-15T11:12:55.658-04:00A few days ago I was watching a documentary about ...A few days ago I was watching a documentary about the collapse of the skywalks in the atrium of the Kansas City Hyatt Recency in 1981 that killed 114 people. Long story short, the welded box beams that the skywalks were suspended from were not nearly as strong as they were thought to be. They would have had to be at least three times stronger to carry the load.<br /><br />As a direct result of this disaster, civil engineering standards were revamped nationwide, with new standards often requiring that load bearing structural steel beams be three to four times as strong as before. Also, the engineering firm that signed off on the design at first tried to pass the buck by saying the contractor that built the welded box beams did not build them right. The new rules said that if you as the engineer sign off on the design, then YOU are responsible for making sure everything is done right. So these are probably some of the reasons that your friend is being required to have it built strong enough to support a 20 foot deep swimming pool.<br /><br />As an aside, I worked at that Hyatt for two years from 1991 to 1993. Some of my co-workers had been there that night, and ten years later were still haunted by the memory of that experience.George Truehttps://www.blogger.com/profile/17352709031834067303noreply@blogger.com