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'[TECH] 3 Questions for N-gin-neers'
2009\07\02@115754 by

3 Questions for an Engineer

Question # 1:
How much does a house weigh?

Question # 2:
How much weight can a rural two-lane bridge Hold?

See
http://oh-god.com:5080/dir/3Q/

Question # 3

IS THIS BE COVERED BY
HOUSE INSURANCE,
CAR INSURANCE,
OR,
DOES IT COME UNDER ROADSIDE ASSISTANCE ?

> See http://oh-god.com:5080/dir/3Q/

Must be a NASA job.  The house was weighed in kilograms and the bridge
specified in pounds.

********************************************************************
Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products
(978) 742-9014.  Gold level PIC consultants since 2000.
The value of the house just went up.  It has a natural water feature.  Now

-----Original Message-----
From: piclist-bouncesmit.edu [piclist-bouncesmit.edu] On Behalf Of
AGSCalabrese
Sent: July 2, 2009 11:58 AM
To: Microcontroller discussion list - Public.
Subject: [TECH] 3 Questions for N-gin-neers

3 Questions for an Engineer

Question # 1:
How much does a house weigh?

Question # 2:
How much weight can a rural two-lane bridge Hold?

See
http://oh-god.com:5080/dir/3Q/

Question # 3

IS THIS BE COVERED BY
HOUSE INSURANCE,
CAR INSURANCE,
OR,
DOES IT COME UNDER ROADSIDE ASSISTANCE ?

Sounds interesting, love to see it, but the link is down... is there an
alternate source to see?

Rolf

AGSCalabrese wrote:
{Quote hidden}

AGSCalabrese wrote:
{Quote hidden}

http://www.snopes.com/photos/accident/housebridge.asp

OK.

Rolf
Houses weight can vary, a stone or brick house can easily go over 100
tons (2000 lbs/ton). Much more massive structures are moved regularly,
including 100 year old 100' high brick light houses (Google Cape Hatteras)

All bridges have a design allowable load, and then that is reduced with
time, based on inspection. I have done bridge inspections on old
railroad bridges. The process is to check for loose rivets and bolts,
bent members, and measure thicknesses (whats not rust). This info is
taken back to the office, and using the info to calculate new allowable
loads. After the Silver Bridge Collapse across the Ohio River, the
Federal government (USA) mandated regular bridge inspections. Then the
bridges rated and should be posted loads are determined. If the bridge
load is not posted, generally it is assumed any load legal on highways
requires a permit. As part of the permit process, all bridges to be
crossed, dimension restrictions are checked, and the permit defines the
route allowed and sometimes the time of the day to be traveled.

Within the last week, our County Engineer closed a bridge near us. It is
a privately owned bridge on a public road (strange deal). The owner
doesn't want to fix it, and the county doesn't want a collapse. The
bridge has been posted with reduced loads for some time.

But, things happen, design errors, cheating on materials during
construction, not identifying a defect during inspection, etc. And then
there is the driver bootlegging (cheating) on the legal loads. The Ohio
state trooper stopped a truck that was severely overloaded with a large
stamping press in Central Ohio. The press started in Central Indiana,
and headed to central Pennsylvania. The load was so heavy, that it was
not permitted to travel the highways any further. Fortunately there was
a railroad track, near, and the load traveled by rail the rest of the
way. Many times these bootleg loads travel the back roads, where the

Most of the time, structural failures are details like connections or
minor members, and almost rarely its a main member (beam or column) that
fails. The I-35 bridge last year, Minneapolis, failure was due to some
repair construction materials, and finally rush hour traffic loads
brought it down.  Not unusual, a series of events, probably any one or
2, and no problem.

To answer #2, a single car, or even pedestrian traffic may be the limit,
or could be in the 100's of tons range. The full range. I drove a Ford
Bronco SUV with the family, weight right a 3 tons across the Royal Gorge
Bridge (highest suspension bridge in the USA - google for it),with a 3
ton limit. There was considerable pedestrian traffic. As we approached,
the foot traffic scattered quickly. We were really rocking the bridge!! :)

Rolf wrote:
{Quote hidden}

:: o answer #2, a single car, or even pedestrian traffic may be the
:: limit,
:: or could be in the 100's of tons range. The full range. I drove a
:: Ford
:: Bronco SUV with the family, weight right a 3 tons across the Royal
:: Gorge
:: Bridge (highest suspension bridge in the USA - google for it),with
:: a 3
:: ton limit. There was considerable pedestrian traffic. As we
:: approached,
:: the foot traffic scattered quickly. We were really rocking the
:: bridge!! :)

In London (UK) there is Battersea Bridge, which is basically made of
wood - whilst cars streem over it into and out of London (used to be
time of day directional) the horseguards (their barracks used to be
just down the road in Chelsea), would have to dismount to cross the
bridge. The vibrations caused by a 20 odd horses trotting over the
bridge managed to be at the right natural oscillation frequency and
the bridge was in danger of falling down, but a a 10 ton truck roaring
over no problem.

Colin
--
cdb, colinbtech-online.co.uk on 4/07/2009

Web presence: http://www.btech-online.co.uk

Hosted by:  http://www.1and1.co.uk/?k_id=7988359

Just like electrical circuits oscillate, structures do also. Wind and
earthquakes can cause big time vibrations, but floors can bounce up and
down from a person walking. Today the phenomenon is better understood
and certain floor weights/spans are avoided. For tall buildings the
latest is mass tuned dampers. Heavy weights near the top, suspended like
a pendulum or on low friction bearings with hydraulic dampers, just like
on your car, except much larger.

{Quote hidden}

:: floors can bounce up and down from a person walking.

During the times of the Samurai, the Japanese
used to have a Nightingale floor, special floor made of wood,
designed to creak and 'sing' if someone walked on it.

The target customer being a paraniod Samurai who feared being killed
in his sleep - the floor would wake him or his guards if such a thing
were attempted.

I wonder if the knowledge exists to build one today?

Colin
cdb, colinbtech-online.co.uk on 4/07/2009

Web presence: http://www.btech-online.co.uk

Hosted by:  http://www.1and1.co.uk/?k_id=7988359

cdb wrote:
>
> :: floors can bounce up and down from a person walking.
>
> During the times of the Samurai, the Japanese
>  used to have a Nightingale floor, special floor made of wood,
> designed to creak and 'sing' if someone walked on it.
>
> The target customer being a paraniod Samurai who feared being killed
> in his sleep - the floor would wake him or his guards if such a thing
> were attempted.
>
> I wonder if the knowledge exists to build one today?

Easy. Mount a strain gauge to any floor, connect it to a PIC, with a
piezo speaker for the sound of your choice :)

Cheers,

Bob

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