Recent content by nvn

itsmi: Your answer is correct. The second moments of area of the two cases are equal. The reason is as explained by you. I.e., as you alluded to, the neutral axes of the individual components are coincident. Therefore, there is no relative motion between the telescoped parts.

buell23: How is lambda_p computed?

blake92: Your approach described in post 1 sounds correct for the transverse (bending) load. And there is also a longitudinal, compressive load (from the ladder midspan to the ground), which might need to be taken into account. Is this a schoolwork question?

blake92: I currently would assume the beams are simply-supported (for checking the midspans). If we blindly ignore dynamic loading, uneven loading, and weldment stresses, then I currently would say the horizontal beams together could hold, 26 900 N (purple) 89 120 N (purple) 89 120 N...

mnray: In a quick check, the minimum bending strength of 127 x 127 x 9.525 mm structural angle appears to be 2.19 times greater than 50.8 x 6.35 mm square tube. And the minimum bending stiffness of 127 x 127 x 9.525 mm structural angle appears to be 3.87 times greater than 50.8 x 6.35 mm square...

Primoz: Yes, this perhaps can be done, for the given 2-D plane. Are you using one rectangular rosette strain gauge on each side of your cantilever beam, near the fixed support? Each leg of each strain gauge needs to be labeled, so we can write equations using your strain gauge legs. What is the...

steves1080: Although you perhaps could adjust your wind pressure, your calculations are correct, and your answer is correct, for the given assumptions. However, the applied forces actually act at the lamp centerline, which is a moment arm of 382 mm, instead of 613 mm. Therefore, this reduces...

Goodluck: Please cancel my questions in post 5. I now figured out items 4 and 5. And, I currently think you will be using item 2 in post 5, not item 1.

Goodluck: First, (1) what is "a conventional top-rope belay system"? (2) What is "a conventional traversing element operated using a self-belayed lanyard system"? (3) Which of these two systems are you using? (4) What does "static belay" mean? (5) What does "dynamic belay" mean?

mechgen: I think the PIPE288 versus PIPE16 answers should be virtually the same, in most cases, unless the cantilever is quite short, or perhaps the displacement is large. If you post your real constants, and your SECDATA, then perhaps someone might be able to check whether they are equivalent...

AJ Kazakov: Good point. I currently am not sure how to do it in Ansys. In other programs, I probably would release the beam element local Ry, Rz dof at end 1, and release Rx, Ry, Rz at end 2, on each lattice member, where, e.g., Rx = element rotational dof about the element local CS x axis. For...

None. You should have no rotational coupling (about the x, y, and z axes) of the lattice members with each chord.

AJ Kazakov: Perhaps try this. When you merge chord keypoints, deselect lattice member keypoints. I.e., do not merge lattice member keypoints. Then, create coupled dof, for translations only, between the lattice member nodes and the chord node (?).

encorelui2: So far, your formula looks correct. And, it is not limited to right triangles. It does not matter whether it touches the x-axis or not. And it does not matter what quadrant it is in. It only needs to have one side coincident (collinear) with the y axis, assuming b is the...

Would you be able to post a free-body diagram (FBD) of the tapered rectangular plate, showing constraints, applied forces, dimensions, and plate material?