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tperazzo tperazzo is offline
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Join Date: Nov 2008
Location: Huntington Beach, CA
Posts: 416
Originally Posted by aoncurly View Post
The diagonals, much like building diagonals, only see load due to forces perpendicular to the strut/brace. (A building lateral system is your system, rotated 90-degrees, and diagonals are for lateral forces such as wind on a building.) I would agree that the addition of diagonals would increase torsional rigidity, but my comments were in reference to loads you described earlier in your video (you only showed loads in one direction). I think there is differential vertical displacement of the strut towers as the car flexes, thus creating a vertical load component at the strut towers. The actual load path is probably very circuitous so I think it's a bit more complicated than you originally described, but your point is well-taken: the braces will aid in torsional rigidity.

Yep, I thought in your first message you said that the diagonal bar doesn't contribute to torsional rigidity.

In terms of vertical loading due to the deflected shape isn't a big load compared to the reaction forces from the the strut. If you look at the cross section of the cars construction through the shock towers you see will this: Under the horizontal line is the deflected shape. Notice the double shear boxes.

Now even if the shock towers displace up or down, the strut does little to constrain it.

The same deflected shape is typical during torsional stress.


Last edited by tperazzo; 01-21-2019 at 06:03 PM..
Old 01-21-2019, 03:23 PM
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