AWS D1.1 Section 5.10.3 gives "recommended" minimum nominal thickness of backing bars, provided the backing shall be of sufficient thickness to prevent melt-through. For SMAW, that recommendation is 3/16-inch.
If melt-through is prevented, is a thinner backing plate allowed? I see for...
Could anyone recommend a good design guide or text related to prestressed steel girders?
I have a non-composite rolled steel beam bridge (W33x130) with timber deck that needs to be strengthened. Options I've looked at include cover plates and cover plate with composite concrete deck. One...
I'm not that familiar with UT testing to D1.1 and am trying to educate myself on it. What does "leg" mean? Reference specification for a project says "testing in leg 4 will not be accepted"
My thought is that it has to do with the reflection of the wave and the testing of welds where you...
The primary purpose of entraining air is to improve resistance to the effects of freeze/thaw.
In my concrete book, it also says it improves workability, durability, and reduces segregation during placing.
I read a short article on this from AISC. If you go to www.aisc.org and search "LFD", an article called "Bridge Crossings No. 5" is listed. It's from March 1997 and is entitled "LFD vs. LRFD - What's up with the Letter "R" anyway?"
You could try the influence line spreadsheet on www.yakpol.net. Not exactly what you're looking for, but it's a start.
Other than that, I use the moving load generator in GT-STRUDL or RISA for this, but those are a bit costly I think for just checking your analysis.
A good place to start on this is to look at the standard specifications for the state highway department where you're working.
From my experience, which is limited, you would compact the top 6 inches of subgrade to 95% maximum density. You would have to specify to which test the density...
I've gone through a design for a sheet pile bulkhead for a barge docking facility using the Navy DM 7.02 manual and checking hand calcs with the Corps' CWALSHT program and have arrived at a proposed solution, but before finalizing things, I've got a few questions I'm hoping someone can provide...
I have an existing crane rail on timber ties supported by a timber substructure. The concrete deck around the rail has deteriorated and is being replaced. I am planning on forming the concrete to about 2" away from the rail to avoid any flexing of the rail cracking the new deck. This...
I have a curved bridge in plan (X-Z plane, Y is vertical)with intermediate piers perpendicular to the curve. BETA angles are used to correctly rotate the columns into proper local coordinate system (local Z is perpendicular to curve).
I need to get top of column displacement along the pier (in...
Sorry if this is a basic question for most of you, but I am confused by some terminology I have come across in some plans. "Economy Bolts" are called out for a connection. What is the definition of "economy bolt"? Does it conform to ASTM A 307 or some other specification...
Yakov -
Were you ever able to find any information on this material? I am looking into using it for fill in an abutment for an elevated roadway, but need to learn more about it. My primary concern is how it acts in a seismic event. What sort of lateral loads would we expect to see from the...
I was wondering if someone out there could provide some insight into the shear capacity equations for steel plate girders in the "Strength Design" section of AASHTO (16th ed). This is in Section 10.48.8.
I am trying to determine the shear capacity of an existing plate girder with...
