How Do Horizontally Oriented Gussets Perform in Cantilever Bending?

[Baluncore]

Sure, here is what i mean (no welding, just bolts/screws+plates):

In post #3 you show a T junction.
By “vertical orientation”, do you mean “plan view”?
By “horizontal orientation”, do you mean “end elevation”?
If the members are RSJs, or I-beams, then how do you propose to put the nuts and bolts through the flange with the web in the way?

 

[lordvon]

If I understand you correctly, this is where I think you misunderstand:

No, the longitudinal shear is going through a cross-section of height h (the thickness) at a certain distance from the centroid of the area formed by both plates (even if they are not connected together).

A single plate (compression at the bottom, tension on top) is not the same as 2 plates apart (compression in bottom plate, tension in top plate).

I actually agreed with you at one point. But I did the experiment I described to you in the previous post and got the result that leads to my belief now. Also I believe that the longitudinal shear has to be transmitted throughout the cross-section somehow. But I am happy to be proven wrong.

 

[lordvon]

Not sensibly.
The joint would evaporate, due to the lack of external load.
Or become really heavy because of fear, uncertainty and doubt, about the unspecified possible externals.The weakest link may be weak in a direction that is not the limiting factor.

well, agree to disagree then. thanks for the input.

 

[jack action]

I actually agreed with you at one point. But I did the experiment I described to you in the previous post and got the result that leads to my belief now. Also I believe that the longitudinal shear has to be transmitted throughout the cross-section somehow. But I am happy to be proven wrong.

I think you are referring to buckling which is another mode of failure. For example, if you take a square tubing and replace it with a pile of thin plates forming the exact same shape, a force acting in the plane perpendicular to the plates may induce buckling on the compressed exterior plate. If it fails, then the effective area of the whole beam is reduced which may lead to a chain reaction of failures one after another.

 

[lordvon]

I think you are referring to buckling which is another mode of failure. For example, if you take a square tubing and replace it with a pile of thin plates forming the exact same shape, a force acting in the plane perpendicular to the plates may induce buckling on the compressed exterior plate. If it fails, then the effective area of the whole beam is reduced which may lead to a chain reaction of failures one after another.

yes i am familiar with buckling, and i mentioned it here in earlier posts. the failure i observed was not due to buckling.

 

[Tom.G]

I actually agreed with you at one point. But I did the experiment I described to you in the previous post and got the result that leads to my belief now. Also I believe that the longitudinal shear has to be transmitted throughout the cross-section somehow. But I am happy to be proven wrong.

Since you actually did the experiment, perhaps the way to end the confusion is to post clear before and after photos of the experiment with all dimensions, materials and force applications documented.

As is sometimes said, "A picture is worth a thousand words." Take advantage of that! Otherwise, all that is happening is words (noises) are being tossed back and forth.

 

[lordvon]

Since you actually did the experiment, perhaps the way to end the confusion is to post clear before and after photos of the experiment with all dimensions, materials and force applications documented.

As is sometimes said, "A picture is worth a thousand words." Take advantage of that! Otherwise, all that is happening is words (noises) are being tossed back and forth.

Agreed. This was a few years ago. I could easily replicate it...

And of course there is always the possibility i did it wrong and/or interpreted the results incorrectly.