Infrastructure and Energy Sector

[Anirbann Datta]

i'd say there should be a national level review on any infrastructure in India that uses steel cables. when idiots or complacency comes in conflict with physics, physics will win, in case of steel cables they are governed by laws of physics i.e stress and tension, no escape.

does not mean eliminate all steel cable infrastructure, might as well restrict the usage factoring in complacency, there by reducing points of failure.

this is not something new, countries do these reviews all the time. ex: this is how asbestos got eliminated from building materials for past two-three decades.

Republic TV showcased that there were 675 or 625 tickets issued, where the bearing capacity was max 100 at a given time frame!!! ( incl 12 member of local MP's family - all deceased )
Over-stress- leave alone the resonance doubling factor can result in catastrophic failure of any load bearing structure or cable. Generally fos is taken> 1.5 to 2..., this 5+ times load even suppressed that with multitude!
Now in factual note, just checked the post-snap image, THOUGH I am no specialist, it seems there were too many people gathered at the centre point( where the longitudinal stress stretches max!), at a certain time frame they must had shifted their orientation to one side of the bride ( might be to observe some event ongoing) which resulted unsettled load resulting one cable snap followed by 2nd one to fail ( found many hanging in side net - some even got wrapped to some extent). Might be wrong though.

 

[Jimih]

Republic TV showcased that there were 675 or 625 tickets issued, where the bearing capacity was max 100 at a given time frame!!! ( incl 12 member of local MP's family - all deceased )
Over-stress- leave alone the resonance doubling factor can result in catastrophic failure of any load bearing structure or cable. Generally fos is taken> 1.5 to 2..., this 5+ times load even suppressed that with multitude!
Now in factual note, just checked the post-snap image, THOUGH I am no specialist, it seems there were too many people gathered at the centre point( where the longitudinal stress stretches max!), at a certain time frame they must had shifted their orientation to one side of the bride ( might be to observe some event ongoing) which resulted unsettled load resulting one cable snap followed by 2nd one to fail ( found many hanging in side net - some even got wrapped to some extent). Might be wrong though.

Mechanical Resonance, Structural Vibration along with exceeding maximum capacity of public on the bridge might have led to the bridge collapse.

Don't know about the wind speed prevailing at that moment though, it can be a factor too, as moderate wind speed produces Aerostatic Flutter.

 

[Anirbann Datta]

Mechanical Resonance, Structural Vibration along with exceeding maximum capacity of public on the bridge might have led to the bridge collapse.

Don't know about the wind speed, it can be a factor too, as moderate wind speed produces Aerostatic Flutter.

JUST WHAT I said--- now just found that exact simulation in TWitty.!!!!! My idea was not wrong it seems..

 

[Jimih]

JUST WHAT I said--- now just found that in TWitty.!!!!!

Dang....Physics won at last.

 

[Haldilal]

The article you have posted says that person inagurated the bridge before verification . And there was ticket system . Need to check which authority allowed sell of 675 tickets ... some people also intentionally shacking the bridge ..

Ya'll Nibbiars It's was under the PPP.

The Municipality official says that contract was awarded to Oreva Group, a E Bikes manufacturing firm to maintain and operate it for 15 years. And further said it was opened to public without getting fitness certificate from the local authority after renovation.

 

[Jambudweepa]

Ya'll Nibbiars It's was under the PPP.

The Municipality official says that contract was awarded to Oreva Group, a E-bikes manf firm to maintain and operate it for 15 years. And further said it was opened to public without getting fitness certificate from the local authority after renovation.

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Then company is at fault . It might be desparate to earn money .

 

[Haldilal]

Then company is at fault . It might be desparate to earn money .

Ya'll Nibbiars I say both, can't open without any kick backs. And 8 crores spent, 17 rupees ticket per person. And to earn a 12,000 ruppes in a hour let this tragedy happened.

 

[Anirbann Datta]

Mechanical Resonance, Structural Vibration along with exceeding maximum capacity of public on the bridge might have led to the bridge collapse.

Don't know about the wind speed prevailing at that moment though, it can be a factor too, as moderate wind speed produces Aerostatic Flutter.

during over-crowded situation, the most contributing factor is -US, the people, during wobbling, we always try to counter balance it by shifting self to other side.
Problem arises when the effect stretches in long span( presence of lateral wind stream amplify that greatly)!! so, before nullification to act upon, another wave hits in, then the on board people tries to counter that too by again shifting to the other side, resulting more wobbling effect.
I think I need to de-dust my old books to re-read theories again long lost 16 years past.. ( )rather presenting cooked- up theories..

 

[ezsasa]

during over-crowded situation, the most contributing factor is -US, the people, during wobbling, we always try to counter balance it by shifting self to other side.
Problem arises when the effect stretches in long span( presence of lateral wind stream amplify that greatly)!! so, before nullification to act upon, another wave hits in, then the on board people tries to counter that too by again shifting to the other side, resulting more wobbling effect.
I think I need to de-dust my old books to re-read theories again long lost 16 years past.. ( )rather presenting cooked- up theories..

hopefully some science wallahs explain this incident from a scientific perspective preferably in a video format with graphics. since Indian journalists are not so bright, they will explain this only from a political and governance failure perspective.

scientific reporting has to grow in India, can't rely only on traditional journalists to explain things, their vocational training does not allow them to think from scientific perspective.

 

[Haldilal]

Ya'll Nibbiars

 

[thebakofbakchod]

Ya'll Nibbiars It's was under the PPP.

The Municipality official says that contract was awarded to Oreva Group, a E Bikes manufacturing firm to maintain and operate it for 15 years. And further said it was opened to public without getting fitness certificate from the local authority after renovation.

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Lol what load of bullshit. First hang that municipal officer. What a idiotic cretin. A bridge like that with so many people going on it wouldn't have gone unnoticed. What was he doing in the 1 week it was "illegally" open? Only when disaster strikes, these cretins will begin the blame game

 

[mokoman]

Mechanical Resonance, Structural Vibration along with exceeding maximum capacity of public on the bridge might have led to the bridge collapse.

Don't know about the wind speed prevailing at that moment though, it can be a factor too, as moderate wind speed produces Aerostatic Flutter.

reason .


1. try to break bridge

2. bridge breaks

3. profit ???

 

[Jimih]

reason .

And this is how the factors that I mentioned in my post were set in motion.

 

[Knowitall]

And this is how the factors that I mentioned in my post were set in motion.

That video is 4 years old.

 

[Jimih]

That video is 4 years old.

Yes, what I meant was this may be the reason behind the collapse on that fateful day.

Vigorous shaking of the bridge's suspension cables by the dimwits were always present from the start and this may have led to the said Physical phenomenas leading to the collapse.

 

[Varoon2]

Yes, what I meant was this may be the reason behind the collapse on that fateful day.

Vigorous shaking of the bridge's suspension cables by the dimwits were always present from the start and this may have led to the said Physical phenomenas leading to the collapse.

True, but this looks like an accident waiting to happen. 500 people on a bridge meant for only 200

 

[Suryavanshi]

The bridge wasn't wide enough, are all suspended like that?
Anyways all heads need to roll.
Max capacity was 100 who thought letting on 600 was a good idea.
The private contractors needs to be severely punished, the authorities who delayed the safety check needs to be hanged.

 

[Love Charger]

The bridge wasn't wide enough, are all suspended like that?
Anyways all heads need to roll.
Max capacity was 100 who thought letting on 600 was a good idea.
The private contractors needs to be severely punished, the authorities who delayed the safety check needs to be hanged.

And you need to calm down, for we are not in sher shah suris era .
I say this because you know , I know kuch nai hoga .
To kyu gussa karna

 

[Jimih]

True, but this looks like an accident waiting to happen. 500 people on a bridge meant for only 200

This was meant to happen no doubt about that.

Amount of steel and diameter of the suspender cables should be more on Cable Suspended Bridges as the tension forces are more at the centre.

SIT also has to find out the flaws in the construction.

 

[Suryavanshi]

This was meant to happen no doubt about that.

Amount of steel and diameter of the suspender cables should be more on Cable Suspended Bridges as the tension forces are more at the centre.

SIT also has to find out the flaws in the construction.

Flaws in the construction?
There is no flaw in the construction.
It just wasn't meant to handle that many people

Had the people used it for pedestrian purpose rather than donky Kong no such thing would have happened.