I must have found this topic more interesting than the other bridge engineers around here.
What intrigues me the most is that limiting designers to ZERO tensile stress at SERVICE III would often result in deeper girders, additional girders lines, and an increased prestressing steel quantity...
AASHTO [5.12.3.3.4] allows for the calculation of restraint moments (caused by deck shrinkage and restrained girder rotations) to be waived when a positive moment connection per [5.12.3.3.9] is provided (usually by simply extending prestressing strands into diaphragm) and requiring the girders...
Interesting. I think these comments are regionally motivated or influenced. Simple span made continuous for live load is a bread and butter preferred structure type for highway bridges in my market. The design tasks aren't too hard either, anyone capable of designing a steel bridge can easily...
This is ACI 318 based but shows the physics at play quite well. I'm unfamiliar with the Canadian code differences but since this is a full example calc maybe you can find the differences and set up your own Canadian version in excel. I use this method in excel and iterate over the neutral axis...
I would not solely use the AASHTO LRFD Bridge Design Specifications for the design of this structure. The code is written for vehicular traffic bridges which have structural properties and behavior much different than this castellated beam.
Section [1.1] SCOPE OF SPECIFICATIONS states "The...
You told us you were designing this bridge in other threads. You've asked for design resources, posted pictures of your structural model, and have asked many other very basic and concerning questions. If you are actually designing this you need to be honest with yourself and the capabilities of...
If you just solve a continuous beam loaded with the Design Truck and compare moments to the table you will notice the table values are much lower. Why? You need to determine how much of the deck resists this load, Your value needs to be divided by the strip width in 4.6.2.1.
Table A4-1 reports...
I just want to second the resource dik shared. I used an earlier version of that same file to set up my circular reinforced concrete column excel sheet that generates the interaction diagrams. I've had great success comparing my excel diagrams/capacities/results to software output for bridge...
Not an addendum but AASHTO publishes the LRFD Guide Specifications for the Design of Pedestrian Bridges. The free table of contents can be found here:
https://store.transportation.org/Item/PublicationDetail?ID=1552
The WSDOT Bridge Design manual [5.2.1.C] does not allow tension in bridge girders at the service III limit state, i.e. final stresses after losses with all permanent loads plus live load. AASHTO LRFD 9th edition Table [T5.9.2.3.2b-1] allows some tension in the precompressed tensile zone assuming...
I think "the kinks" come from moving to a closed book format regarding references that are not codes, transitioning the long form essay into a multiple choice format, and moving from 2 day 16 hour to 5 each 4 hour sessions. The "regular" PE exams were a much less drastic change IMO...take the...
I took the exam in 2022 & April 2023. From reddit and engineer boards it seems 200-300 hours per exam is the going rate these days as the exam only gets broader and codes only get larger. My time includes 1 failed attempt at lateral; with 30 days to go I realized passing the lateral PM was a...
Transfer typically refers to the stage immediately after stressing but before time dependent losses can occur. At this point you can add steel to the top of your section, minimize the eccentricity of your strands, reduce strand quantity, or change sections to increase the denominators recalling...
Drift, the exam is moving to full CBT after the October 2023 cycle, including the afternoon. The exam will now be 5 4 hour sessions instead of 2 8 hour exams.
The SE was a whole different animal than the PE with structural depth IMO; significantly harder, more in depth, and time was much more of a concern.
There are some unicorns out there who have enough professional experience they could pass without extensive studying but for the vast majority of...
It is Dr. Foued Zayati.
Picture this, we've all heard someone ask a question in a professional or academic setting where the instant response of half the room is "oof, you should really know that by now, you're destined to fail if you don't get this already." I found it refreshing and almost...
This is an interesting and goofy structure. If I'm interpreting everything correctly this looks like a summer intern project gone wrong! My first concern is for the web crippling of the metal deck panels due top lack of bearing area.
The grid of pipes is already fully constructed and now you...
First and foremost, be aware the SE is transitioning to a computer based testing after the October 2023 cycle so the opinions you collect will be from people who studied for and took a different format of the exam. I feel for people testing in 2024/2025; they're literal guinea pigs for an...
