Timeline for Exact anlytical solution for beam-lifting problem constrained by crane capacity
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Mar 10, 2019 at 13:06 | vote | accept | Mechanician | ||
| Mar 10, 2019 at 13:02 | vote | accept | Mechanician | ||
| Mar 10, 2019 at 13:06 | |||||
| Mar 9, 2019 at 15:13 | comment | added | kamran | @alephzero, by the safest way I mean as far as actual job site requirements. Because of control of the undesirable wobbling and angular momentum of the beam while cranes' are having the beam raise. What if there is a gust of wind or if they are not operating in good synchrony. The farther the hooks the more control. | |
| Mar 9, 2019 at 13:01 | comment | added | alephzero | Actually this isn't the "safest" way to lift a beam which is likely to crack in tension (e.g. concrete or stone). You want to position the ropes to minimize the absolute value of the maximum bending moment at any point along the beam. The ropes will be somewhere near the 1/4 and 3/4 positions along the length (but with the 4:5 ratio distances from the center) to do that. | |
| Mar 9, 2019 at 2:03 | history | edited | Wasabi | CC BY-SA 4.0 |
added 103 characters in body
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| Mar 9, 2019 at 0:58 | history | edited | kamran | CC BY-SA 4.0 |
added arithmetic for clarity.
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| Mar 8, 2019 at 23:07 | history | answered | kamran | CC BY-SA 4.0 |