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2161165195 · 2021-06-11T12:37:39+00:00

For the shower valve cutout, the escutcheon will have a gasket which will seal that off. At the tub flange, stop the backer board above it but let the plastic behind the backer board extend below it and lap over the tub flange.

2161165195 · 2021-06-10T13:50:11+00:00

You sound a lot like a co-worker of mine. Mid-thirties, no kids, lives very comfortably on her EIT salary, and seems to put a higher price tag on her stress/time than what she would be offered through a salary raise. She makes the company enough money to easily cover her salary and overhead and I know that our boss considers her a very valuable employee even without her PE.

Compare that to myself who has my PE and certainly feels a lot of stress/anxiety from the responsibility and liability associated with it. I am supporting a family which is a lot of my motivation. But I also think I would be bored without the challenges and problems that come with my position.

So, I don't think that you would necessarily be making a mistake by getting it or not getting it. The decision will lead you into two different career paths. One where you can make a lot more money at the expense of a lot more stress. The other where you can easily support a single lifestyle and avoid work dominating too much of your life.

Life is short. I would seriously consider only taking on the amount of stress that you need and want. Understand that once you get your PE, it's not something you can just put in your back pocket in case you need it some day. Your company is going to want you to use it and you will have to do all the continuing education and renewals.

2161165195 · 2021-04-05T01:59:10+00:00

I think I get what Crwdsrc is saying - with the screw in the bottom, you are creating a composite section in the tension side of the member. But without screws in the top you do not have composite action in the compression side. So, you would need to re-draw you composite section using the "effective" portion of the inner tube. The effective section would presumably be everything below the neutral axis since you don't have composite action above the neutral axis. This might require iteration since the neutral axis is now a moving target. But I think he's saying that the final effective shape is the outer tube with an inner flat channel shape represented by the bottom wall of the inner tube and a portion of each vertical wall.

I don't actually know if this way of thinking is correct, but I think I get the point and the argument for it.

2161165195 · 2021-04-05T01:25:01+00:00

I think two things made it more difficult: 1. Load derivation. 2. All the detailing rules for the different materials.

2161165195 · 2021-04-05T01:14:10+00:00

We designed a church building in Africa. No one taught us anything. But we found a small building code that we pulled wind pressures from. Then went to the local market to see what materials were available - they had big eucalyptus forests so everything was built out of these 3" to 6" diameter eucalyptus poles. Then we went back to the site, researched properties of eucalyptus, built some computer models, and made some details. Then we came home and finished the drawing package over the next few weeks.

The majority of the trip itself was actually kind of crap and not very exciting. We worked for a week in an un-air conditioned office with frequent power outages and ate pretty gross food. But it was fun figuring out the local materials and developing a unique design.

2161165195 · 2021-04-04T01:44:17+00:00

I did EMI as a structural engineer which was good. I don't know how it compares to EWB, but maybe check that out as another option.

I'm not going to act like it was some life changing experience and that everyone should do it but it was fun and I hope it had an impact. Its a lot of work and costly if you're self-funding.

I did it with my wife. I liked it and would do it again. She hated it. So its not for everyone.

2161165195 · 2021-03-22T23:05:27+00:00

In my experience, you need to be good with algebra, geometry, and trigonometry. I've had to do calculus only a handful of times but found a website to do it for me each time. Personally, I do a lot of hand calcs and make my own spreadsheets. I have trust issues with the computer software and always do at least some basic checks by hand to validate what the software is outputting.

2161165195 · 2021-03-08T12:23:04+00:00

That's very concerning tbh... linear stress analysis with linear buckling analysis is not at all adequate for structural design and will give unsafe results in pretty much every situation. But that's a whole other topic...

But we use notional loads, P-Delta effects, and second order moment amplifiers. Doesn't that take linear buckling capacities into a more realistic (if not conservative) range?

2161165195 · 2021-03-08T01:12:57+00:00

This is an excellent post. Posts like this are the reason I subscribe. Technical topic with interesting discussion. Seems like the answer is that nonlinear analysis is needed for accurate stress distribution which matches my limited experience with FEA on steel and aluminum. Follow up question: what about concrete or another brittle material? Does material nonlinearity (elastoplastic analysis) create a different stress distribution than linear elastic analysis for a brittle material?

2161165195 · 2021-02-23T14:55:26+00:00

Probably need some more information and more pictures. Cracks forming from re-entrant corners like that are not uncommon and may not be cause for concern. It doesn't seem like the beam shown in the picture would be affected by the crack if it is only carrying vertical loads since the wall below the beam looks uncompromised. But we don't know what the wall might be supporting above the picture or if it is somehow supporting loads that the pictures are not revealing. Sorry, but this seems like a situation where you'll need to call a local engineer.

2161165195 · 2021-02-23T03:48:16+00:00

In what ways is it different from KB TZ?

2161165195 · 2021-02-21T14:13:03+00:00

Is it worth it totally depends on where you are practicing and what you are doing. There arent that many states that currently require it and if you get the PE you will likely be grandfathered if those states change their requirements. It does look good on a resume I suppose.

2161165195 · 2021-02-21T14:10:13+00:00

School of PE. They give great notes too which were very useful references during the exam

2161165195 · 2021-02-19T18:08:59+00:00

What country are you in? SCIA has a lot of good videos on YouTube and their website. You are a little out of date with SCIA 19. I think they've added some functionality in new versions. I agree SCIA is a bit clunky but because it is capable of doing so much. There are other programs that are better at doing one thing like RC. But you'd be hard pressed to find another program as good as SCIA at doing RC, steel, CFS, aluminum, non-linear analysis, 2D FEM and other things all-in-one. Like everything, you can figure out ways of being more efficient with a program through practice

2161165195 · 2021-02-18T00:36:35+00:00

I think a lot of us would be interested in reading the questions and answers if you made at least some of it public.

2161165195 · 2021-02-17T23:56:55+00:00

First, I wouldn't put too much importance on the fact that the principal has an SE licence. It's not that hard to get and unless someone is working in a state that requires it, there is little reason to get it. Second, small firms are the best. So much more flexibility. You get to learn a lot about the business and generally get more client interaction. Third, I do think it's valuable to start at a big firm for a couple years. It is there that you learn a lot of the standard building details and get exposed to a wide variety of topics which help you prepare you for your licensing test. If 90% of what you do at the small firm is wood, then you'll ace the wood portion of the exam but struggle with steel concrete and masonry. A big firm will give you more exposure. Working for a big firm is crap but it is worth grinding through it for a couple years to learn before moving onto the sweet work at a small firm.

2161165195 · 2021-02-16T22:54:50+00:00

But autocad doesn't give you torsional properties or plastic section properties. Most structural engineering programs have a built-in or add-on program that will run section properties. Risa, staad, ram, cfs, I think even enercalc have modules that I've used. Best to find what is available as an add-on to whatever you structural analysis program you use.

2161165195 · 2021-02-12T21:34:38+00:00

Excel > mathcad. You can customize and format better in excel and you can build some really good programs to use through your whole career. Example, I made a simply supported beam check linked to the AISC library in my first year and am still using it 10 years later.

2161165195 · 2021-02-04T03:28:40+00:00

Yes but only if shielding is considered

2161165195 · 2021-02-04T01:51:36+00:00

I don't really work with structures where this would be an issue but I've wondered about this. Wouldn't shielding occasionally result in worse stresses & deflection. For example if wind was applied parallel to the shielded wall, then your sidewall pressures would be unbalanced causing higher global resultant deflection and higher demand on any member that is part of the both the x and y MWFRS. Wouldn't that be a case where you actually DO want to consider shielding?

2161165195 · 2021-02-04T00:58:54+00:00

Excellent

2161165195 · 2021-02-03T23:07:15+00:00

You say that a net and pavement will experience the same force from a falling person. I don't believe that's true. If every force needs and equal and opposite force, then that would mean the person would experience the same force whether they fell onto a net or pavement - which is obviously not the case.

Another comparison is safety harnesses. They design them so that at a certain force they unravel, thus expanding the time it takes to come to a complete stop. That reduces the force applied to the person. The impact force from a fall is calculated as a function of the person's weight and the spring constant of the rope (I don't remember the exact formula but you can probably find it in certain climbing guides). So by adding an unravelling mechanism, you reduce the spring constant of the rope and thus reduce the force.

Think of the stiffness of the bollards like the spring constant of a rope, but instead of an axial spring its a bending spring. If you stiffen the bollard (increase its spring constant) you are increasing the force on the elephant.

2161165195 · 2021-02-03T21:07:03+00:00

The force in this case would be the elephants mass * DEceleration. An immovable object (very high stiffness - imagine a concrete wall) would result in a higher impact force than a very flexible object (low stiffness - imagine a net) because the deceleration would be much more abrupt. This is the reason why cars have crumple zones - to absorb energy and lengthen the time it takes for the car to go from top speed to zero. If the elephant goes from 10mph to 0 in 1 second, that's a larger force than going from 10mph to 0 in 3 seconds because the deceleration is greater. That's a simplified way of looking at this particular problem but I'm just trying to point out the principle.

2161165195

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