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Thanks for the help and clarification everyone. We should cover the sodium bentonite with a layer of compacted soil.

Yeah I think they could do that as an option. I've never seen that approach. It's interesting.

Hello, We are working on a project which involves installing piles inside a tank compound. The compound has a clay liner as a floor and it has a berm all the way around. Since we'll install piles we'll break the liner and so I would like to seal the area around the piles. On a previous project...

Buggar, I thought about running a plate through the HSS, but I thought that would be more expensive than using a double plate.

Thanks for the reply Lomarandi. I attached a link to a sketch of the connection in the original message, but I think you understood regardless.

Hello fellow engineers, I have a structural problem involving a round HSS which I hope you may help me with. This is the situation. 1. There is an HSS406x9.5 column which will receive moment from a W310x97 as well as an axial load. The factored moment is 229 kN·m and the axial load is 33 kN in...

The soil is failing under bearing at the toe due to a high eccentricity. For example, e/D=0.36.

Thanks for the reply KootK. Would you consider any lateral soil resistance even if not passive? For example at-rest?

Hi fellow engineers, I’m evaluating an existing shallow foundation, please see the attached diagram, and I would like to know if it’s logical to account for passive soil resistance in the “empty + wind” load case. Here is the background: [ul] Octagonal foundation (7’ feet, 7’-10” deep) has...

Hi fellow members, I'm trying to design a pipe support but I'm not sure how to realistically model my idea. This is the situation: I'm trying to attach an U-shape support underneath an existing platform. Welding is not an option. Due to the width of the existing beam flange, I can only get...

Hello fellow engineers, I'm trying to design a bolted moment connection between a W-shape column and an HSS cantilever beam. The HSS beam would be connected to the flange of the W-shape. While looking at some books I noticed the HSS was always a column and never a beam. Does anybody know if...

Hi rackookpe1978: CL of plate to edge of concrete? [highlight #FCE94F]12"[/highlight] size of plate? [highlight #FCE94F]1 1/2"x16"x18"[/highlight]exactly what the load bearing steel going down to the plate is shaped (the load won't be centered in the exact center of the plate if it is an angle...

Hi StructDave, No I haven't seen any rebar corrosion. Has the concrete been damaged by freeze-thaw exposure? I think freeze-thaw will make the problem worse since water will fall in the cracks and they should grow. But I don't think freeze-thaw exposure caused this damage. Yes it's possible...

Maybe I should have specified that the load on the steel plate is approximately 99,000 lbs unfactored. The plate is 16" by 18" and it's 1.5" thick. The concrete is assumed to be 3000 psi as this is the value shown on the drawings from 1970.

Hello fellow engineers, I'm trying determine what caused the corners of a concrete support to crack. This is a 40 year old concrete structure supporting a vessel. It looks to me like bearing failure. However, my calculations say only 30% of the concrete bearing capacity is being used. I've...

ishvaag: Why do you see the intent of building a simply supported end of strut when there is a 1/4" weld connecting the insert? How would this allow rotation?

OK thanks a lot BAretired. I wasn't sure if what I was thinking made sense. Thanks for your opinion.

Hi BAretired, The struts are gravity loaded. As for the negative moment becoming positive moment, I meant to say the magnitude of the positive moment changes. If the connection is limited to a moment of 87 kNm then the magnitude of the midspan (positive moment) is larger than the moment at the...

Thanks Qshake for the quick reply and for pointing out the attachment was missing. What do you say about there being more steel at the top than the bottom? http://files.engineering.com/getfile.aspx?folder=20c35f7a-08bc-4f9e-b288-a4fe3839f5b8&file=Strut_insert.pdf

Hi all, Currently I have a problem finding the moment resistance of a connectio in an existing concrete struture. While it may sound easy, my results don't convince me. Attached is a sketch and this is a description of the problem: I am analyzing existing concrete frames. These frames are...