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Pangani overpass
tnai9
#1 Posted : Wednesday, September 23, 2015 11:14:25 AM
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Joined: 6/21/2010
Posts: 345
Location: easto
Wazuans,
I have been using this bridge for a while mostly in the morning. Yesterday I noticed that it shakes so badly. I noticed this when there was traffic and I had stopped right at the top of the overpass. Has someone else ever experienced this? Is it by design or its a flaw? With those huge concrete support pillars I am really surprised. I expect that the bridge should be fixed in its place. The only 'movement' I expect should be due to expansion/contraction which shouldn't be noticeable. Architects/Mechanical engineers, what is your take?
"The problem with the world is that the intelligent people are full of doubts, while the stupid ones are full of confidence." ― Charles Bukowski
Swenani
#2 Posted : Wednesday, September 23, 2015 11:37:36 AM
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Joined: 8/15/2013
Posts: 13,237
Location: Vacuum
tnai9 wrote:
Wazuans,
I have been using this bridge for a while mostly in the morning. Yesterday I noticed that it shakes so badly. I noticed this when there was traffic and I had stopped right at the top of the overpass. Has someone else ever experienced this? Is it by design or its a flaw? With those huge concrete support pillars I am really surprised. I expect that the bridge should be fixed in its place. The only 'movement' I expect should be due to expansion/contraction which shouldn't be noticeable. Architects/Mechanical engineers, what is your take?



Jeso! .....@Impunity
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poundfoolish
#3 Posted : Wednesday, September 23, 2015 12:06:26 PM
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Joined: 12/2/2009
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Wacha ianguke irudishiwe Raira...
wanyee
#4 Posted : Wednesday, September 23, 2015 1:29:32 PM
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Joined: 7/17/2011
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Location: Mbui-Nzau, Kikumbulyu
Same thing with the one near View Park Towers ..Likoni road /Msa road / Southern By pass..it shakes a lot ..its quite scary to hang around there
mkeiy
#5 Posted : Wednesday, September 23, 2015 2:12:17 PM
Rank: Member


Joined: 1/27/2012
Posts: 851
Location: Nairobi
tnai9 wrote:
Wazuans,
I have been using this bridge for a while mostly in the morning. Yesterday I noticed that it shakes so badly. I noticed this when there was traffic and I had stopped right at the top of the overpass. Has someone else ever experienced this? Is it by design or its a flaw? With those huge concrete support pillars I am really surprised. I expect that the bridge should be fixed in its place. The only 'movement' I expect should be due to expansion/contraction which shouldn't be noticeable. Architects/Mechanical engineers, what is your take?



If they were rigid, what would happen in case of earthquake?
Siringi
#6 Posted : Wednesday, September 23, 2015 2:41:34 PM
Rank: Elder


Joined: 6/8/2013
Posts: 2,517
Nothing to worry about smile Have you been on Nyali Bridge Mombasa and your side has Jam halafu the other side lorries pass with speed?Sad d'oh!

I you look carefuly you'll notice joints, bridges especially long ones are built with allowances for some play. Any engineer friend told me its something to do with expansion and contraction otherwise they would crack due to weather extremeties
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kelly04
#7 Posted : Wednesday, September 23, 2015 3:09:41 PM
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Joined: 11/9/2011
Posts: 30
wanyee wrote:
Same thing with the one near View Park Towers ..Likoni road /Msa road / Southern By pass..it shakes a lot ..its quite scary to hang around there


Huko ni wapi?Laughing out loudly Laughing out loudly Laughing out loudly
Njung'e
#8 Posted : Wednesday, September 23, 2015 3:13:50 PM
Rank: Elder


Joined: 2/7/2007
Posts: 11,935
Location: Nairobi
All structures are designed/built with certain forces such as load and other natural forces in mind.It would therefore be unreasonable to build stiff enough structures without giving them benefits of these forces.Consider a tree in the wind.What would happen if it did not sway in the wind? certainly,it would break up in many places just like glass.It is therefore imperative that the engineer does his calculations of the materials to be used to come up with a structure that can sway (resonate) reasonably or acceptably.There are standards of course. In this particular instance,the overpass resonates due to load or vibrations from adjacent roads or activities. It is therefore quite okay for the overpass to react that way smile .Indeed,the worry should be,if it did not vibrate/shake/resonate at all.That one would surely not last. Also,as someone has put it,movements of such structures are also caused by expansion facilitation.
Nothing great was ever achieved without enthusiasm.
Impunity
#9 Posted : Wednesday, September 23, 2015 6:17:33 PM
Rank: Elder


Joined: 3/2/2009
Posts: 26,330
Location: Masada
Swenani wrote:
tnai9 wrote:
Wazuans,
I have been using this bridge for a while mostly in the morning. Yesterday I noticed that it shakes so badly. I noticed this when there was traffic and I had stopped right at the top of the overpass. Has someone else ever experienced this? Is it by design or its a flaw? With those huge concrete support pillars I am really surprised. I expect that the bridge should be fixed in its place. The only 'movement' I expect should be due to expansion/contraction which shouldn't be noticeable. Architects/Mechanical engineers, what is your take?



Jeso! .....@Impunity


As long as it does not vibrate on its natural frequency, the so called resonance, worry not...that's the design.
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hardwood
#10 Posted : Wednesday, September 23, 2015 6:44:05 PM
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Joined: 7/28/2015
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Location: Rodi Kopany, Homa Bay
I was in juja recently and was stuck kwa jam over that bridge over Thika rd and there were these funny vibrations and i was worried we were about to plummet huko chini.
murchr
#11 Posted : Wednesday, September 23, 2015 6:57:22 PM
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Joined: 2/26/2012
Posts: 15,980
That happens.....its a bridge and cars are moving under it. Laughing out loudly. Kunawatu physics iliwaendea mbaya sana Laughing out loudly Laughing out loudly Laughing out loudly Laughing out loudly
"There are only two emotions in the market, hope & fear. The problem is you hope when you should fear & fear when you should hope: - Jesse Livermore
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dunkang
#12 Posted : Wednesday, September 23, 2015 7:06:42 PM
Rank: Elder


Joined: 6/2/2011
Posts: 4,818
Location: -1.2107, 36.8831
tnai9 wrote:
Wazuans,
I have been using this bridge for a while mostly in the morning. Yesterday I noticed that it shakes so badly. I noticed this when there was traffic and I had stopped right at the top of the overpass. Has someone else ever experienced this? Is it by design or its a flaw? With those huge concrete support pillars I am really surprised. I expect that the bridge should be fixed in its place. The only 'movement' I expect should be due to expansion/contraction which shouldn't be noticeable. Architects/Mechanical engineers, what is your take?

Are you serious that you directed that question to Architects and Mechanical Engineers???

You even don't deserve an answer, its evident you won't get it! Just WACHANA NAYO!
Receive with simplicity everything that happens to you.” ― Rashi

Euge
#13 Posted : Wednesday, September 23, 2015 8:16:21 PM
Rank: Elder


Joined: 8/4/2008
Posts: 2,849
Location: Rupi
kelly04 wrote:
wanyee wrote:
Same thing with the one near View Park Towers ..Likoni road /Msa road / Southern By pass..it shakes a lot ..its quite scary to hang around there


Huko ni wapi?Laughing out loudly Laughing out loudly Laughing out loudly

Laughing out loudly
Laughing out loudly
Laughing out loudly
Nashangaa pia
Lord, thank you!
geofreygachie
#14 Posted : Wednesday, September 23, 2015 8:32:48 PM
Rank: Member


Joined: 2/27/2014
Posts: 454
Location: Republic of Enchantment.
wanyee wrote:
Same thing with the one near View Park Towers ..Likoni road /Msa road / Southern By pass..it shakes a lot ..its quite scary to hang around there


Idling ???Shame on you Shame on you Shame on you Shame on you
Divers - can you laugh in scuba gear, or will you drown? I was wondering. - James May.
tnai9
#15 Posted : Wednesday, September 23, 2015 8:58:40 PM
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Joined: 6/21/2010
Posts: 345
Location: easto
murchr wrote:
That happens.....its a bridge and cars are moving under it. Laughing out loudly. Kunawatu physics iliwaendea mbaya sana Laughing out loudly Laughing out loudly Laughing out loudly Laughing out loudly


We never shared a class @Murchr so wacha kejeli. I doubt you would have beaten me in academics unless if you were an A+ student. I was a marking scheme in physics all the way to campo. I talked about allowance for expansion/contraction in my post think that is form 1 or 2 physics. There are those joints to allow for 'horizontal movement'(expansion/contraction). I was asking why a reinforced rigid pillar fixed and reinforced into the earth feels like its swinging sideways. Its like KICC acting like a pendulum. Unless if there are rollers between the pillars and those horizontal structures that form the tarmac.

Plus I don't expect the shaking to result from the cars moving under the bridge. Maybe a trailer/train would. A vitz/note cannot. The shaking would most probably be caused by the heavy cars moving on the bridge or wind..
"The problem with the world is that the intelligent people are full of doubts, while the stupid ones are full of confidence." ― Charles Bukowski
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