I'm updating a spreadsheet from 7th edition to 8th edition and was hoping to avoid the tedium of updating every single Article reference by hand. Anyone have a document similar to the ACI 318-11 to ACI 318-14 transition key or a list of all sections that have changed?
Ian Riley, PE, SE...
I have a large slab design that requires a high point load in random locations. Basically 10,000 psi on a 9" circle or less. A possible solution is just a movable baseplate that the client has to locate under the load each time; however the client was rightly concerned that this may not happen...
Just want to check on how the hive mind would handle this.
Designing a summer camp dormitory structure. The building will be elevated on screw piles and posts with the site sloping upward toward one side of the structure. See below:
My first thought was to design this as an open monoslope...
Best video I can find of the collapse of the retaining wall: https://www.reddit.com/r/CatastrophicFailure/comments/91sfnw/concrete_retaining_wall_failure_allows_a_hill/
Never done a soil nailed retaining wall of this magnitude personally but this looks very haphazardly constructed, not...
Designing an alternative to a cast-in-place wingwall for a precast box culvert we're doing. The original cast-in-place wingwall was a secondary pour off of the culvert and thus was positively connected with rebar across the cold-joint.
I'm debating whether I actually need a positive connection...
We've got a need for hooks of a #5 bar at the edge of a precast bridge plank with a tighter bend radius than a standard hook (to maintain clear cover requirements).
I've been unable to locate any research or recommendation on how this will effect the development length of the bar. Obviously a...
So, maybe I'm crazy but I'm almost positive this wasn't always the case. If you go to ASCE/SEI's website for ASCE 7 supplements and errata it appears like you can download them. However, when you click on it you're given the option to purchase them (with the exception of the expanded seismic...
In the 2011 MSJC (TMS 402, ACI 530-11, ASCE 5-11) under Section 1.18.3.2.6 it says that the minimum wall horizontal and vertical reinforcement is to be based off of the gross cross-sectional area of the wall using specified dimensions.
Under definitions, the code lists:
Dimension, nominal -...
We've had a few of our customers recently contact us about precast steps having spalling occur on precast steps following hydroseeding operations adjacent to the steps. This is the first I've ever heard of this being an issue.
Is there anything in the hydroseeding process that can harm...
Before anyone asks; yes, I'm 100% going to talk to a lawyer and/or insurance agent about this to be sure. I want to see what your thoughts are before going into this so I understand how practical/common this is.
Currently my employer pays for E+O insurance while I do the engineering for the...
Got an interesting discussion topic from a fellow engineer. In short, it boils down to flexible diaphragms with subdiaphragms and their deflection. For these systems, does the subdiaphragm increase the deflection of the diaphragm (either locally by the subdiaphragm deflecting beyond the...
Does anyone have any good references on the detailing or design of precast tee beam girders to abutment connection? I may have a single span prestressed girder project project coming up where we'll be responsible for this connection detail and I can't seem to find a good reference on the typical...
I'm able to work around the requirement from 15.4.1 that doesn't allow hoop reinforcement in the base sections, so this isn't critical to get this answered. However, I'm exceedingly curious if anyone has a rational for why welded wire reinforcement is the only permitted reinforcement for...
In the 2006 edition (black) of the seismic design manual they had Table 3-1 which gave design values for EBF link beams. In the 2nd edition (maroon) seismic design manual this table appears to have been removed. Any idea where it went or why it was deleted?
Professional Engineer (ME, NH, MA)...
This will be a long post, tl;dr: if you had an NCEES record and want to use it to quickly apply to a state then good luck getting it updated quickly. For those who don't have a record yet but want one just know that the new system is fairly improved over the old one.
A little less than a year...
Trying to be a hero for a customer, we have an old, cast-iron LeBaron "heavy duty" LS368 36"Ø manhole frame and cover. It's for a smaller municipal airport but they want it to be rated for a 100,000 dual-wheel aircraft load. The LeBaron catalog we have does not indicate what "heavy duty" is and...
So, I have an interesting task at work where I need to make the attached supporting system work for a series of 3-sided precast culverts for a job. The presumptive soil bearing pressures are good and the 3-sided structure has been designed for the pin-roller support condition it will face. The...
Got an interesting job and I'm interested if anyone has any good concepts on how to approach this.
Client has a 40 ft diameter concrete tank with an arched steel dome over it and is looking to replace the dome. The cover has to take large snow loads (~70 PSF ground snow) plus pedestrian loads...
I emailed AASHTO about this a while ago and never got it resolved.
Does anyone have a copy of AASHTO LRFD Bridge Design Specifications Fig 11.10.10.1-1 they can send me? The one in my AASHTO got screwed up (see attached) when they printed it and I have yet to get a corrected copy. Just...
I work mainly doing precast structural design work these days with very little consulting work. However, someone found my name and asked me to take on an interesting side job doing the structural design for a high-end residential home. My boss gave me permission to do it on my own time but under...
