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Thank you purdue86. Thanks for taking a quick look in the manual, I really appreciate that. The question is in reference to a RR bridge that is already designed, with a shear key on a portion of the wingwall footings only. The abutments are supported completely on piling. In this case, the...

I recently heard it said that a footing shear keys (to resist sliding) in wingwall footings are not acceptable for a railroad bridge. The local railroad authority's standard criteria mentions nothing of the sort. I don't have a copy of AREMA manual. Does anyony know if this is an AREMA...

MotorCity: You are correct, and I understand what you said, however, this is a slab on grade used as a drainage channel lining. There will be no traffic loads imposed other than an occassional skid-steer loader to remove sediment, etc. The reinforcing steel, in this case, is for the purpose of...

While I appreciate all the replies indicating what proper steel clearance is (I am familiar with ACI code requirements on this), what I'm really looking for is thoughts/opinions, or info on any literature that address excessive cover. This is a continuously reinforced slab - i.e no joints other...

Situation - 8" (min.) thick continuously reinforced concrete slab used to pave a drainage channel. Channel section is trapezoidal with 12' wide bottom and 7ft. deep. The reinforcing steel (#5 @8" longitudinal, #4@16" transverse) was placed too low in the slab. Bottom cover is thus around 1"...

Correct - the code does not address it - thus the reason for the question! Thank you - I submitted my inquiry through the link you posted.

Hello? Anyone?

The LRFD Specifications for Steel Hollow Structural Sections include provisions for determining the strength of the section when there is a concentrated force distributed longitudinally at the center of the HSS face (section 8.2). There is no distinction made for whether this load is assumed to...

Ok - the studs seem like a good option. Thanks for the link and the info. Can studs be welded via a gun onto a vertical surface, or does it have to be on a horizontal surface? There is still one question that hasn't been answered. And let's forget for a minute that this might not be the best...

What would be "many". There would be about 100 to 150 in this application. So there are weldable studs available that are threaded? From where?

Thank you CWIC for your quick reply. Just to clarify a few things: So the welder is not expected to know what types of end treatments are appropriate, rather the drawings must include this information in the form of a weld symbol? Also, in the prequalified complete joint penetration groove...

If I wish to specify that a 3/4" diameter A307 threaded rod be butt welded to a flat plate or beam flange using a full penetration weld: 1. Is a weld symbol required, or would simply stating with a plan note that a fiull penetration weld be used be adequate? 2. If a weld symbol is not...