• 0 Posts
  • 32 Comments
Joined 2 years ago
cake
Cake day: June 29th, 2023

help-circle


  • Picking a fight with a superpower is generally a poor idea. Killing military members - even in Jordan - might be considered a bit beyond mere commerce.

    Edit: I did misremember the attackers in Jordan and thought that was part of the Houthi organization. The Houthi’s are attacking US warship(s) in the area, but haven’t directly killed an US service members that we know of/yet. The Jordan attack was (now that I’ve checked again) by one of the groups operating under the Islamic Resistance in Iraq.

    My only defense here is that all of these attacks on US and UK vessels (merchant and military) are in retribution for the US support of Israel. And, yes, there are a lot of groups backed by Iran and Iraq who are using the Israel-Hamas/Israel destruction of Gaza as an excuse to lash out at Western powers who (generally) provide support to Israel. My apologies for the error.


  • One option would be to make the beam a flush condition. To get a 16’ span with rafters you’re going to be using at least 2x8s. That’s 7.25" deep. If you were set the top of the beam at the top of the rafters and hang them from the beam (simpson or USP hangers) that buys you some space. Now an 11.88" LVL would only stick down 5-5/8" below the bottom of the rafters. (okay, 5-3/4"-6" with the additional slope over the 5.25" of beam) I’m not saying that a 3 ply 11x88 LVL with a 2.1E, bearing in a BC6 cap on 6x6s would work for your application, but the height tolerance would seem to add up in your favor.


  • The advantage of LVLs are that

    1. you can put them up 1 ply at a time
    2. they hold nails/cut easily
    3. the lumber yard will likely size them for you if you ask

    The disadvantage is that the depth will be about 1/16th of the span when using 2-3 plies.

    The advantage of steel is that an I beam (W shape is what you want, for “Wide Flange Beam”) will be about 2/3 the depth of an LVL. The disadvantages are

    1. An engineer will likely charge you about $600-800 to size this beam, but will also tell you how to top connect it
    2. It will be one piece (fwiw it will weigh about the same as the LVL)
    3. You will have to buy a 40’ piece, or pay a premium to have it cut down from a 40’ piece. (stock lengths of steel are 20’/40’)

    Note that nobody can properly answer your question from the data given (edit - just notice you mentioned 16’ rafters below). You would need to include the span of the rafters and (at least) your location to determine the snow loads and wind loads (edit: and seismic, though it’s unlikely to control for this design) for sizing the connections.

    Disclaimer: I’m a structural engineer, but I’m not your structural engineer. For a long span like this I recommend contacting someone licensed in your jurisdiction to help you out.






  • I don’t think the “indicators” are a useful metric of personal betterment, which is what makes individual people feel better about the economy. Stock market being up, interest rates and inflation going down, productivity up and salaries on the increase are all positive conditions. But if your salary isn’t rising as fast as the combined inflation of the past 4 years and all of your companies profits are feeding dividends and stock buy-backs instead of plant expansion and increasing benefits then it’s a net negative in your bank account at the end of the month. Insurance rates - auto, health, homeowners (esp if you’re coastal) are soaring up, which hits the average pocketbook but probably has no weight in economic indicators. Lord help you if you’re paying tuition or taking out loans for college. It’s more than $4000 per class at a typical state university, if you’re not subsidized by scholarship or the state.

    It doesn’t help that the news cycle is (somewhat rightly) pointing out how imbalanced and broken the socioeconomic system is.










  • I think I read your title differently - as in, gravity would ebb and flow like wind or rain or barometric pressure or temperature. In normal days the gravity might be mostly constant, or may fluctuate a few percent as the day goes on, rising and falling over the diurnal cycle. But at times a gravity storm could blow through, causing wild fluctuations from just a few percent (or even reversing!) to a couple hundred percent, causing travelers to lose their un-secured cargo or to be pinned in place until the storm subsides. Locals would know the dangers and have things easily tied down, or beds for riding a gravity storm in relative comfort, but any huge storms people would evacuate, praying that the fluctuations wouldn’t destroy their homes or farms. (And now I’m imagining the end of O Brother Where Art Thou with the cow on the roof)