I have a somewhat complex steel bridge structure that we are designing. It's tall, has lots of complicated welds, has battered built-up members with braces in two directions. I am considering requiring that the steel fabricator hold an AISC (ABR) Advanced Bridge Fabricator Certification. I...
I'm helping out a friend on their house design and I'm going out tomorrow for an inspection. He sent me some progress photos and I noticed that the carpenters notched the end of the rafters significantly! It looks to be about half the rafter height. They are 2x12 rafters. I checked it and the...
I've mentioned before that I don't do a lot of wood design and I have always gotten very helpful advice from everyone in the past. For that... I appreciate you all.
For a typical scenario where you would be doing a gable roof extension off of an existing roof with 1/2" plywood. What is the best...
Our specifications call for SSPC SP10 Near White Metal Blasting with a corresponding anchor tooth profile of 2.0-3.5 mils for an existing rusted steel truss bridge prior to paint. Is it possible to obtain an equivalent profile of the steel with SP11 Power Tool Cleaning to Bare Metal with...
We are needing to build a bridge over an existing bridge as an emergency support system. I need to anchor the support brackets for the new bridge to the existing concrete bridge pier columns. My concern, and the thing that I am not too familiar with is the torqueing of the through bolts that...
I have some repairs that we are making to a steel plate girder bridge. We are welding new 1/4" steel plates to the outside of the girder web. We specified similar repairs to another area of this bridge last year and were told that the Contractor warped the 1/4" steel plates when they made the...
I have some very simple aluminum railings that we designed that are being used for a pier in the ocean. The fabricator is substituting round tube for the flat bar that I had specified on the horizontal members. I don't actually have a problem with this other than the fact that they are calling...
See attached sketch. For retrofitting an existing roof, we are planning on extending out a new rafter (to match existing roof pitch) out from an existing roof truss. I don't know if this is the best detail to accomplish this. Do you guys have any ideas...
I'm hoping to get ideas from some of you folks that may have experience with similar situations. We are rebuilding several waterway flumes and utility bridge crossings and there is one small flume in particular that needs to remain constructed out of wood for historic reasons. I think we can...
So we've had interns in the past and I've typically been one of the mid-level engineers that is responsible for keeping the interns busy and learning. I had one intern in the past that was fantastic! She was sharp, tech savvy, and helped me tremendously produce hundreds of pages of calculations...
The longer you look, the worse it gets....
I'm helping a colleague as they are in escrow to buy this house. I'm headed out tomorrow morning to take a look at it in person.
This portion of the outdoor lanai is a concrete topped metal decking (however, I don't think that is a metal deck and...
Is anyone familiar with a company who manufacturers duplex grade stainless steel mooring cleats? I'm not looking for 316 stainless steel but something like 2205. I would like to specify it on a job but can't seem to find anyone who makes it.
Any help would be appreciated. Thanks.
Most of the piers that I have experience with are more generic and not so rounded. This particular project has an architect providing guidance to the developer but is not part of the design team. They provided some rough guidance on pier geometry. This is what I came up with. Do you guys have...
In regards to the design of the basement wall (shown in Magenta) and the cantilever wall above it, would the presence of the gravity retaining wall on the backside have additional negative effects or induce additional lateral earth pressures on the basement wall (Shown in Case 1) vs. as if the...
Does anybody have experience with designing a stainless steel cable railing? I'm working on some for a golf course and everything that I come across seems to be really geared toward the residential DIY'er and supplied in kit form. I think that I'm getting bogged down with all these online...
Can anyone help point me in the right direction for the appropriate guide specification that governs above ground concrete tank design in the US? I have a 100ft diameter reservoir tank that needs to be designed.
Thanks!
I am referring to ASTM A1094 vs. ASTM A767 rebar. A few years back I was getting solicited from a US based supplier of ASTM A1094 rebar (they shall remain unnamed). They have been in business for 3 years now and I believe this technology comes out of China. I did my research on them right away...
I was going to transition the floor type on the bottom level from slab on grade to wood joists over a crawl space. The house is built on a very steeply graded lot and it just works out that this makes sense to me as this would save the homeowner on excavation work (existing ground is rock). I'm...
ASTM A615 has both Grade 75 and Grade 80 rebar. ASTM A706 has grade 80. I understand that A706 provides greater ductility than A615 but why do we have both grade 75 and grade 80? With such a small difference in the strength there must be some other reason why you would use Grade 80 over Grade 75...
Our State has (in my opinion) a rather strange stance on providing protection to pedestrians when traversing a bridge and I wanted to get everyone else's input on what the standard of practice is in their State.
For example, new highway design, speed limit less than 45 mph. Highway has...
