Scaffolding is typically pin jointed, so minimal bending forces on the members. Mainly compression but some of those members can be in tension (diagonal braces for example). In stating that, some bending in the members that support the walkways.
Review the load paths under different conditions to determine loads as they are transferred through your structure. eg, when worker is on the scaffold, that load is transferred along the plank then down into the support members below.
Load direction? Worker (live load), force is down (gravity). Wind could be from any direction (side force typically, thus bracing etc rqd)
I’m tutoring some 4th year engineering students and their course lacks plenty in regard to load paths, so some of the students here don’t even appreciate these things.
Structural failure - warping, bending, failure at connections (to ground, to existing structure, scaffolding joints etc). Base/ground support movement Collapse! (bad, could result in injury, death)
Hope this helps @tlgains in addition to CE’s great info.
It’s more than okay. I need more engineering discussions in general in my life.
One of the things I thought of is that scaffolding like this could be prone to severe weather damage (rust, mainly) which would greatly weaken affected members.
One thing to keep in mind about loading on materials: shear stress usually causes failure much sooner than tensile stresses (google shear stress for quick explanations). Most things in the scaffold should see minimal shear unless there is a giant wind blowing directly on the side (or an earthquake I guess).
Not sure how much of this you actually need @tlgains but raven has a lot of great points too.
This was not something I saw in undergraduate school until I took advanced aerospace structures (oddly similar idea to the loading of scaffolding to be honest). It seems like something they should incorporate more of into engineering school. Basic statics and mechanics of materials doesn’t cover it.
Late to the engineering party (is there such a thing?) but to awesome points listed above I would like to emphasize corrosion - its effect both on tensile and shearing stress.
In your scaffolding example @tlgains , if we were to take a practical example, chances are that if there’s a catastrophic failure - collapse of a part or a full one - it’s related to corrosion. Usually due repeated re-utilization of a scaffold and improper storage of the beams in the interim period, usually around the joints, which is then exacerbated by a significant load or a wind gust.
Red band pull aparts x50
Alternating KB swings 16kg x50
KB cleans 16kg 2x10 each arm
Hydrocore side to side swings x50
Kettlebell halos 16kg 2x20
Kettlebell Press (Pavel Style) 16kg 11 each arm
Hydrocore Snatch 2x15
Gray band with Fat Gripz chest press 2x 10, 10
Orange band Flyes 2x15
Question for you:
I had a meeting with my dietitian yesterday and talked her about following the pulse - feast method of eating (for the most part, I use protein shakes and carrots/ whole milk greek yogurt since Mag-10 is crazy expensive). She stated that eating the large meal at night could slow down weight loss (due to metabolism at night). Everything i have seen from respectable studies and reviews from guys like Layne Norton state that above all else calories in vs out are what matters for weight loss. What are your thoughts on larger meals at night (I usually eat before 730 pm and hit the hay around 10pm)?
I only have about 10 lbs to drop to hit my goal of 270lbs by memorial day, but I would like to lean out and perhaps build some muscle while doing this (I think recomp is possible, I have some fat to burn and can keep protein up).
I’m firmly in the calories-in vs calories-out camp. My only concern with eating large quantities late in the day is the potential to negatively impact sleep quality. If you don’t find that happening and you’re seeing continued progress - then I say, keep on keeping on!!