As I mentioned, private bridge. Client wants to build a new home and concrete supplier wants to know if they can take a full load(9 yards of concrete)over the bridge. I designed using 2 tandem 26k axle spaced 4' apart and 10k front axle 14' from rear tandems. The plans do show a sign posting...
I have a single 42' span one lane (13' wide) bridge located on private property. It has a concrete deck supported by wide flange stringers.
The requirements are to design for a 20T truck. I want to design for tandem axles (akin to HL-93). Since this is a private bridge, low volume low speed...
Not sure where your located, but Simpson Strong-Tie has good technical assistance.
I believe they will assist with the design and use a preferred installer that is experienced and competant to install FRP
I remember when I was building my house, the contractor poured all the perimeter, interior continuous and interior spread footings.
The slab section consisted of 4" sand base with w.p. membrane.
When they came to put in the sand, they had this conveyor thing that shot the sand into the pad.
The...
Great suggestions saikee, if the ownership wishes to move on with a more detailed analysis, I will consider these. I worked on a parking structure repair where the upper deck leaked, located where de-icing salts were used because of the snow. Testing lab performed pH tests for carbonation...
saikee,
Excellent observations and comments. I did speak to an SE today highly experienced in shell design and got some great insight. Evidently, the ribs are the primary support and the shell supports the shell as he put it. He mentioned these types of shells are very forgiving, holes aren't...
BA, that is exactly what it is, a short span barrel vault.
I want to thank all of you for the insightful and thoughtful posts. I get a call from this really good client to investigate the possibility of supporting the conveyor from the roof, and I think "no big deal" (Project is 3 hour flight...
KootK, the first 8' of the arch is 4" thick and transitions to 2 1/2" thick. We are talking about probably 20 pairs of supports, about 8' o.c. supporting about 250 pounds per support. This is a conveyor as well, so there is some vibratory loading. The supports would be located at...
That's just it. Over the years, the building is almost 60 years old with existing conveyors/equipment supported from the roof. Additionally, HVAC and plumbing upgrades poked more and irregular holes in the roof. It looks like someone took a hammer and beat an opening for the pipe penetrations...
I have an owner who wants to suspend equipment from a thin shell concrete roof (Monoclastic shell). The shell varies from 4" to 2 1/2" thick. The arch is 80 feet wide. Knowing I can't get proper embedment with an epoxy anchor, I would penetrate through the shell and anchor from the top...
We have an existing beam to column connection that we now have to weld the shear plate to the beam web.
The existing connection has been painted.
The welders can grind most of the paint away, but cant grind all the paint at the joint.
Please, all the CWI's respond, anyone else with experience...
I remember back in the day an older steel manual suggested Fy/800 x span (inches)
as a starting point to limit vibrations in floors and Fy/1000 x span for roof members
to limit ponding issues. I think it was in the "blue" steel manual.
The bump-out aside, it looks like the decking was replaced with "IPE" or composite decking which doesn't span as far as 2x. The intermediate joists may have been added to reduce the deck span.
hi Jayrod,
I thought this might be of interest to you.http://files.engineering.com/getfile.aspx?folder=7e86a21c-f69b-405d-b313-4af0e0929311&file=TF98JointTesting.pdf
