take out the spaces On Aug 20, 1:16 pm, Jason Payne <[email protected]> wrote: > It was just a straight copy and paste. Sorry. > > On Tue, Aug 17, 2010 at 10:03 AM, Paul Sanow <[email protected]>wrote: > > > I have tried to get on the web site but cannot. Is there a typo? > > Thanks!!! > > > > Date: Mon, 16 Aug 2010 08:47:48 -0700 > > > Subject: [hexayurt] Tying your Yurt down 101 > > > From: [email protected] > > > To: [email protected] > > > > Got this from another group... > > > > This document is also saved as a word .doc with the pictures, > > herehttp://f1. > > > grp.yahoofs. com/v1/AC5nTMhPI Wcii_BfbMhxHP_ keJdr9bXiBzIJTEn > > > bU6rolVwgJMlUkFN 0Bytt5TKrvIeblqe Opg20Mgoq9xhQiQ/ THE%20WIND% 20CARES > > > %20NOT. doc > > > > THE WIND CARES NOT > > > > Tying your shit down 101 > > > > The wind cares not. It cares > > > not that you didn’t sleep, or eat, or drink, or shit. It doesn’t care > > > that you > > > are having the best time of your life, or that you are having the > > > worst day > > > ever. The wind is completely indifferent to you and your needs and > > > feelings. The > > > wind can tear your shit down, break it into pieces, and completely > > > ruin your > > > day, IFyou let it. > > > > This article is about tying > > > things down in the wind. > > > > I am neither a structural > > > engineer nor materials specialist. I am a 26 year veteran of live show > > > production, from major concerts to theme camps and a lot of stuff in > > > between. Over that time I’ve picked up a few things > > > and learned a lot about what the wind does, how it does it, and ways > > > to prevent > > > it from doing those things. I’ve seen over $100,000 in concert > > > lighting truss > > > collapse, fold inward and come crashing down (thankfully no one was > > > standing > > > under it), and I’ve seem $20 shade structures hold up to sustained > > > hurricane > > > force winds over a period of days, and just shrug it off. > > > > The difference is the way in which the structure is tied down or > > > secured. The difference is also weather > > > or not the structure is allowed to oscillate > > > and how much. This craft is known as ‘guying’ and HOW you decide to > > > ‘guy’ > > > your structure can make the difference between a ‘simple’ whiteout, or > > > a major > > > disaster out on the playa. Do it right and your shade will hold up to > > > Godzilla > > > on a meth binge, do it wrong and a 20 mph gust will bring it down on > > > top of > > > you, your tent, your car, your neighbors car, etc. > > > > One thing to remember about > > > wind loading is that the resultant force applied increases > > > exponentially as the > > > wind speed increases. That means doubling the wind speed causes a FOUR > > > TIMES > > > INCREASE in applied loading. So, just because your shade stood up to > > > last > > > night’s whiteout does not mean it will hold up today. The three keys > > > to keeping > > > your shade up at Burning Man are > > > > Solid and redundant guy linesSolid ground anchor pointsDaily/ > > > (sometimes)hourly maintenance of the > > > entire system > > > > SOLID AND REDUNDANT GUY > > > LINES. > > > > This is the main way I see > > > people slacking on their shade so I’m going to tackle it first. > > > > Let’s take a look at a > > > simple 4 legged square shade structure. Please excuse my crappy > > > drawing, I have > > > other talents. > > > > This is a very common type > > > of shade canopy used all over the place and can range from a simple > > > $30 canopy > > > from a camping store, up to more expensive ‘easy-up’s’, and on up to > > > the Costco > > > garage carports or even larger structures. Whatever type the object > > > is, they all react > > > pretty much the same to wind loading. That is to say, they give or > > > flex, or > > > bend slightly as the load is applied. When the force lightens up, the > > > structure > > > returns to its original shape/position. Kind of. This back and forth > > > motion is > > > often what starts the failure of the object and is known as an > > > oscillation. (think: “wonka wonka wonka” > > > action in the wind). We’ve all seen this happening. Your goal when > > > tying > > > anything down is to prevent this oscillation from occurring. > > > > What’s happening is that the > > > oscillation is loosening the tie downs, and the internal joints of the > > > structure itself in many cases. Once that happens it’s usually only a > > > matter of > > > time before the structure gets bent or destroyed for the wind cares > > > not. > > > > Ok, so we need to tie this object > > > down and prevent oscillation from happening? We all get that, but the > > > confusion > > > often comes from HOW to tie it down and in what configuration? You > > > have many > > > choices and they all have their strengths and weaknesses. > > > > The strongest way to tie a > > > square object like this shade structure down would be with an 8 point > > > guy plan. > > > In this view you are looking straight down from above. > > > > In this scenario 8 > > > individual guy lines are run out from the top corners of the shade > > > structure to > > > presumably secure stakes of some sort in the ground. More on that > > > later. This > > > is the strongest but also most labor intensive of the way to guy this > > > shade > > > canopy down. Pros: Strongest and most wind proof. Cons: Labor/ > > > materials intensive, > > > takes more time, uses a lot of real estate > > > > Quite often I see people > > > cutting corners on this design and just going with a 4 point tie down > > > plan as > > > seen below. > > > > 4 points, while faster to > > > set up and maintain has one serious design flaw; if one of the guys on > > > the upwind > > > side of the structure fails or comes loose, that corner of the object > > > is then > > > subjected to a prying action (Torsional loading) and the danger of a > > > failure of > > > the structure increases. Inevitably, this failure will occur A: when > > > you’re out > > > on the playa and not home to stop it. Or B: when you’re just barely > > > asleep in > > > your tent under it. 4 point Pros: quicker to set up, uses less real > > > estate than > > > 8 point. Cons: less redundancy, higher likelihood of failure if one of > > > the > > > lines comes loose. > > > > Another option is one of “Internal > > > Guying”, and though I don’t see it used very often, it’s actually a > > > very solid > > > and elegant way of securing your shade structure against wind loading > > > and > > > oscillations. Take a close look at the center camp structure when > > > you’re out > > > there, it is internally AND externally guyed down. That sucka isn’t > > > moving. Internal > > > guying creates an X pattern on each face, from the corner anchors that > > > the legs > > > are tied into (you ARE staking the legs themselves down too, aren’t > > > you?) > > > > There are two main > > > advantages of the internal guy system. First is the redundancy of all > > > of the > > > ties working together to tightly hold the structure down, and second > > > that it > > > takes up no more real estate that the shade structure itself. This is > > > of > > > particular importance in crowded theme camps where tent camping space > > > is at a > > > premium or when cars are parked close by. > > > > Internal guying Pros: takes > > > up less real estate, less materials: 4 points hold the entire > > > structure down. > > > Cons: corner stakes need to be 100% bomb proof, this usually means > > > going to > > > larger and harder to remove stakes or rebar (see below). > > > > A final word on guy lines is > > > the angle that they come off the structure at. Ultimately you’d want > > > them at a > > > very shallow angle spreading way out to the sides to prevent Torsional > > > loading > > > and oscillations. But again the real estate this consumes would be > > > huge. So > > > most of us end up with somewhere around a 45 degree angle, which is > > > adequate. > > > Just keep in mind that LESS than 45 degree angle (like almost straight > > > down) is > > > increasingly useless. All this does is apply downward pull (load) on > > > the > > > structure but it does nothing to prevent oscillations; the great > > > destroyer of > > > shade at Burning Man. The rule is; 45 degrees outward or greater on > > > the > > > guy lines. > > > > SOLID GROUND ANCHOR POINTS. > > > > By far the most secure > > > anchor point you can create is about 2 feet of rebar pounded down > > > almost flush > > > with the playa and leaning outward against the direction of pull. > > > Rebar is a > > > pain in the ass to remove however at the end of the week in many cases > > > it’s > > > almost TOO solid of an anchor. The dozens of pieces left stranded on > > > the BRC > > > site every year are a testament to this. To be honest, I’ve tied a $30 > > > shade > > > canopy down with 10 inch yellow plastic tent stakes and had no > > > problems at all > > > the entire week. (see maintenance, below) Whatever stakes you use, > > > they’ve got > > > to be bomb proof. If one of your key stakes comes out during the > > > whiteout > > > you’re fucked. The wheel of your car or even a trailer hitch can be a > > > great tie > > > down point too. > > > > The three main things to > > > consider about ground anchors are > > > > SOLIDEasy to remove on load outMarkeable (water bottles, tennis balls, > > > pool > > > noodle cut into chunks) or driven flush with the playa surface to > > > prevent > > > injury. > > > > MAINTENANCE: > > > > No matter what guy system > > > you end up with or what ground anchors they are tied to, it all means > > > nothing > > > without regular maintenance. This one single thing is the second > > > greatest > > > source of destroyed shade at Burning Man after improper guying to > > > begin with. Read > > > this again: MAINTENANCE IS THE KEY TO KEEPING SHADE STANDING > > > > There’s a lot going on out > > > here and you’re sleep deprived, dehydrated, impaired, distracted, or > > > otherwise > > > not paying attention to little stuff like what’s going on with the guy > > > system > > > on your shade. Don’t make this mistake because it means giving the > > > wind time to > > > work > > ... > > read more »
-- You received this message because you are subscribed to the Google Groups "hexayurt" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/hexayurt?hl=en.
