Aisc asd 9th edition pdf download
Quote JAE : I would suggest that if you decide to design to the lastest versions, you make damn sure you know where it is conservative and where it is unconservative relative to the adopted code and adjust your designs such that they at least meet both codes. For years, we've used new research and thinking when it would benefit out designs. We did this by following the current technical literature and research activities. This fell under the phrases 'by other rational engineering methods and, not intended to preclude other ration methods founded on sound engineering principles and judgement,' which are included in most of the basic codes.
Of course, we had to be able to justify and defend our designs, that hasn't changed, that's our job. How much better that? I think we are debating the wrong point here. We, as the primary users of these codes, should say 'enough is enough,' take this edition and shove-it; you haven't really improved the process, you've just made it more complex, made the code fatter and changed the color of the cover and some of the terminology, and cost me a bunch of time and money, without improving my life, or the public's safety.
And, I've talked to a number of building officials who feel this way too, they can't keep up with the pace of the changes either. We're tasked with interpreting the codes correctly and then using them to design and build safe structures; they're only tasked with interpreting the code and arguing with us when the two interpretations don't agree, and they can no longer keep up either.
We should both be talking with the powers-that-be to slow the process down so that we can catch up. This will take a concerted effort because there is big money in publishing. But, let the publishers sit with the next edition or two, until they come up with real improvements to the codes, rather than just more complexity.
Hell, we spend more time now manipulating load combinations and different load factors than it used to take to do a simple design, and there isn't much indication that we are producing better structures, just much more complicated ones. As I see it, the problem with all of the building codes these days that their production and the republication of new versions has become a very costly new cottage industry unto itself, which has diverged from its original purpose.
The code's primary purpose should not just be make-work and profit for the researchers and printers. The release of codes should be better synchronized and the time between releases extended sufficiently so there is some hope that practitioners might learn to use them and understand them before discarding them. Real safety issues, when discovered, should be handled by addendums and publications in the technical journals, etc. Errata should be issued periodically as they are found.
But, otherwise let us use the same code book long enough to get to know it. And the response is always the same: "We have better information and research, why shouldn't the code reflect this better knowledge? And until there's a failure, who's to say whose more right? But that's pretty drastic. I've got caught in this chinese puzzle before and I don't want to again.
My thoughts exactly, Jed. I'm part of the choir. The thing is, I have never heard of a failure of a structural steel member, connection, or structure as a whole which had been designed and constructed in strict accordance with ANY recognized code.
Failures are always due to poor detailing or misunderstanding, and unnecessarily complicated code provisions only increase opportunities for that to happen. The only problem with the 13th Edition is the incredibly thin paper they used. I like the code for the following reasons: -It is easy to use. It is basically "six of one, half dozen of the other" as far as member design when compared to the Green book.
Printed and bound it makes a great reference. I don't like it because they took the stability chapter C from a few nice pages to many many pages when several different approaches and then threw in an appendix for the DAM. I hope like hell they cleaned up this mess in the 14th. Anyone know how they did Chapter C in the new one? In my industry, simple beats complicated any day.
I get angry when others accuse some of us of being behind the times. Contrary to what some have said in this string, the latest code does not need to be used. The differences are minimal. For IBC where applicable, 9th edition is acceptable. Can you immagine that? A 14 year code at the time was still acceptable? And why is this??? There is a reason that we have this discussion every so often. Designing buildings to the lowest possible weight is not always necessary.
A simpler code can co-exist with 13th. And let's make this perfectly clear. It was never an LRFD issue? We use this in concrete. It was always complexity. This discussion would end if the code would add lines such as "in lieu of the last 2 paragraphs and 3 formulas , the following one formula may be used". I'll buy that code.
I still use the 8th for what I do. What's all the fuss about? The point of newer codes is not to use less material, it is to recognize and restrain the use of new methods and technologies. Codes do not lead the industry, they are written by the industry to keep up with the engineers.
I preach against design using less material, slimmer sections, and stronger materials in the name of "savings", when doing so does not make engineering sense. Engineering is not entirely about math, which seems to have gotten lost in the rush to exact solutions and precise computation or theoretical values.
To the issue of relative conservatism of new codes vs. And was easier to understand. The idea of no longer being able to see him when she left and how she had wasted the time five years ago, too blind to see who he was and what he was offering her so freely then, swept into her mind.
What all of you want, eventually. His brother had died, been murdered, and the police investigation had failed him. The sum total of the information on the Limping Man amounted to a few scraps of paper, a few witness statements that went nowhere. A soldier only carries out orders. A good soldier serves his prince. A few yards further on, a woman was selling fruit from a stall covered by a tarpaulin, held down by guy lines attached to butane gas canisters, which were sitting in the emergency lane.
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