Started 1st Mar, 2022
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The Reduction/Elimination of Engineered Structures Failure

Structural failures that cause the loss of life are argued by some to be because the engineers in charge were not licensed professional engineers by their respective government agencies.
Q1 of 2: What do you believe might reduce/eliminate the collapse of engineered structures?
Q2 of 2: Regardless of a professional engineers' license and a university engineering degree(s), what might be the "Root Cause" for such horrific failures?
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Most recent answer

Thanks for your continued contribution Martin, much appreciated.

All replies (10)

1st Mar, 2022
Murat Tiryakioḡlu
Jacksonville University
I am about to complete a manuscript on this with Prof. John Campbell. It is our opinion that what Griffiths referred to as prior (preexisting) crack is an artifact of how we treat liquid metals, filling all engineering metals with invisible cracks that the current NDI techniques cannot detect. So even of the structures have been designed by licensed engineers with high factors of safety, our metallic structures will have invisible defects that open up under stress during failure. The forensic literature is full of these premture fatigue failure cases, although the engineering design seems to be impeaccable.
2 Recommendations
Thank you, Murat, for your useful reply.
Once available, might you send me a copy of your new manuscript?
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1 Recommendation
Another engineer (USA) contributes the following:
Q1 of 2:
The vigilance of materials used when the structure was erected/built. A knowledge/understanding that codes, materials, & soils (base failures) followed/used at the time of construction were different.
Q2 of 2:
Negligence. An attitude/culture of "looking the other way" when informed of possible problems/issues with structures.
1 Recommendation
A colleague writes:
A very interesting question…over-reliance on automated calculations (use of software), no real feel for the behavior of materials..?
5th Mar, 2022
Ahmed Dalaf Ahmed
University of Anbar
For the high rise structure
The use of some alternatives in structural engineering is enough to reduce this risk and prolong the life of failure by generalizing the use of coated concrete, for example, concrete filled steel tubular for columns as well as for beams, which gave a high efficiency in energy absorption and at least delayed the collapse of structures in a remarkable way.
Thanks, Ahmed for sharing your alternative.
18th Mar, 2022
Martin Möser
It's the charlatan's problem. He has a certain basic knowledge, but stretches his possibilities. He has the talent to convince others of his ideas.
Thanks Martin for your insight.
Q. Does your reply limit itself to the "Charlatan" or might it also include:
a. Inability to effectively and efficiently communicate prior to acting?, or,
b. Fear of speaking back to a superior manager?
19th Mar, 2022
Martin Möser
Murphy's laws are not considered sufficiently. Instead the principle is valid: one crow does not peck the other's eye. In an older case the accident occurred in the following way: the construction plan was only valid for static loads instead of dynamic ones. Further, the welding seams were not controlled, and the final test was to soft.
Thanks for your continued contribution Martin, much appreciated.

Similar questions and discussions

Optimization of HCP crystal in VASP
2 replies
  • Chandra Bhanu BasakChandra Bhanu Basak
HCP has two parameters to optimize namely a and c/a; the process detailed here gives pretty accurate result to determine those parameters. Zr is taken as an example here, where positions are special, high symmetry positions, i.e. (1/3, 2/3,1/4) and (2/3, 1/3,3/4)
i. Take 7 to 8 different volumes across the estimated equilibrium volume (from published XRD data).
ii. Range of volume scanned should be typically within +/- 10%
iii. If atom positions are in high symmetry positions then atoms should not be moved. However, in the POSCAR file set 'selected dynamics' and motion should be set to T, to get force info in OUTCAR, but set ISIF=5 in INCAR to change only the shape of the unit cell.
An example of POSCAR -
HCP Zr parama (vary this to get different volume) 1.000000000 0.000000000 0.00000000000 -0.500000000 0.866025404 0.00000000000 0.000000000 0.000000000 1.60000000000 Zr 2 Selective dynamics Direct 0.6666666666666667 0.3333333333333333 0.7500000000000000 T T T 0.3333333333333333 0.6666666666666667 0.2500000000000000 T T T
iv. INCAR setting
NSW=100 NELM=50 EDIFF=1.0E-6
v. Fit 3rd order BM EOS to determine the equilibrium energy, volume and bulk modulus (E0, V0 and B)
vi. For each run also find the final a and c/a
vii. Fit 3rd order BM EOS between E vs. a^3 to determine the equilibrium a0^3, during this fitting keep E0 constant (found from step v)
viii. Now we have both V0 and a0, from which c0/a0 can be calculated. Use these final cell parameters to determine the energy accurately using ISMEAR = -5 in INCAR.

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