I am designing a masonry building in SDC D utilizing special reinforced shear walls. My shear walls are relativly long (50' in some instances)and I've run calcs and find that I dont even need horizontal grouting/rebar for shear because i am so long; however ASCE/MSJC minimums are grouted...
See attached pdf. I have a retaining wall that, contrary to normal, is not resisting external soil pressure, but internal soil pressure from backfill that pushes outward. In my worst spot I have 87" of unbalanced load pushing outward. My concern is that while I have a slab present at the top...
Thanks for the great discussion. Apparently I confused active and at rest with at rest being more stringent. Now my question is: when do you use either of these? I thought for a typical cantilevered retaining wall you use active, is that right?
What is typical for a normal basement wall...
msquared48, why do you say its not a yielding wall? Because of the end conditions? Speaking of which, I analyzed it as a simply supported. I realize there is some moment at the ends due to monolithic pour of perpindicular walls and steel, but i don't think it is a fixed/fixed. Seems to me its...
Thanks Guys. I thought for slabs you had to divide Vc/2. That helps alot being able to use full Vc and that way my slab is fine. My slab is not restrained by a basement slab or floor at the top of the wall; hence my reason for designing it in the horizontal direction. Thus, I don't think I have...
If phiVc is less than Vu/2 what are my options? Two way slab? I have never heard of shear failure in a one way simply supported slab. Have you? Even in a two way slab I see no consideration for shear except for punching shear at concentrated bearing points. For a simply supported one way and two...
I have a tall basement retaining wall (18ft) that I wish to design as a horizontal one way slab system (not a typical vertical one way slab/beam)because my horizontal dimension is much less than my vertical dimension. I have perpindicular walls at the ends of the subject wall that can restrain...
I have a structure with a below grade basement all supported on spread footings. Due to soil expansion we wish to underpin the structure with helical anchors and hydrovac soils from below the footer and install void form below the footer. We are esentially turning a reinforced concrete...
Is there a popular strengths of materials (mechanics of materials) book out there? Mostly I need some good refreshers on principal stresses, mohrs circle, ect..
My undergrad book SUCKED and I need to brush up..
Thanks,
Hi guys.
I have mostly designed with wood and have found Breyer's "Design of Wood Structures" book to be the most complete design resource. I am now getting into concrete, masonry and steel. I wonder if there are similar books to Breyer's wood book for concrete, masonry and steel which teach...
IF the building is, or qualifies for, a historic structure the IEBC will help your client out. The IEBC is very leniant for historic buildings. The 2009 IEBC is VERY differant from past versions, the 09 code completely redefines "dangerous" and is way liberal. It allows you to repair damaged...
Thanks guys. I looked at my state statutes and I have a professional and ethical obligation to report it or I could loose my license. I am not thrilled about it but I'll do what I know is right and let the chips fall where they may.
thanks again.
So I came upon a structural planset from an engineer that was stamped for a 135mph exp B wind speed. The planset was an internet plan set which clearly said something like "lateral force resisting system designed by others". There was nothing in the planset addressing design for this wind...
Yeah, I'm the sole provider for a wife and 2 kids so I can't hang on for to long. It is a bummer that I have invested so much into this business, I do like the hibernation idea. I have been trying to land a contract job locally so that I can go back on my own if and when the time comes. The...
I have talked to multiple firms/friend in my area that have either gone out of buisness or are about to go out of buisness due to this economy. My buisness has taken a HARD hit as well. its down to just me now. This all begs the question: Once its down to just you how long do you hang on before...
Thanks guys. Mike thanks for explaining. I didn't realize the ceiling couldn't be used. I knew in analysis it wouldn't work but I thought it could be used in a prescriptive situation. I usually spec baloon framed gable ends, this happens to be a remodel. The contractors hate it but we have...
I design in high wind region and platform framed gable ends are a big no-no unless you have the proper gable end bracing detail, we typically spec baloon framed gable ends.
I have a situation where the roof is stick built and the gable end is platform framed but there are ceiling joists (at...
Ahh. I think I know what you are talking about. So I think what you call a kerf cut is the same as a plunge cut, is it not? I designed a log beam connection once like this. Great idea, thanks a bunch.
