Rare Example of Instrumented Bldg Damaged During During An E

[Bret Cahill]

http://www.usc.edu/dept/civil_eng/Earthquake_eng/Selected_Publ/PDF/ICS_Paper_II.pdf

Two interesting questions:

Why aren't they instrumenting bldgs today with relatively cheap MEM
accelerometers?

Who decided to spend the equivalent of 200K on force balance
accelerometers and other electronics 40 years ago for a public bldg
out in the desert?


Bret Cahill

 

In sci.physics Bret Cahill <BretCahill@peoplepc.com> wrote:

http://www.usc.edu/dept/civil_eng/Earthquake_eng/Selected_Publ/PDF/ICS_Paper_II.pdf

Two interesting questions:

Why aren't they instrumenting bldgs today with relatively cheap MEM
accelerometers?

Because it is a dumb idea on many, many levels.

Who decided to spend the equivalent of 200K on force balance
accelerometers and other electronics 40 years ago for a public bldg
out in the desert?

If you had read your own link you would know that.


--
Jim Pennino

Remove .spam.sux to reply.

 

[Benj]

On Jun 21, 11:26 pm, Bret Cahill <BretCah...@peoplepc.com> wrote:

http://www.usc.edu/dept/civil_eng/Earthquake_eng/Selected_Publ/PDF/IC...

Two interesting questions:

Why aren't they instrumenting bldgs today with relatively cheap MEM
accelerometers?

Who decided to spend the equivalent of 200K on force balance
accelerometers and other electronics 40 years ago for a public bldg
out in the desert?

Bret Cahill

Hey, it's in Kalifornia! They've got money to burn out there. They not
only give it to our poor but they just encourage ANYBODY from ANYWHERE
to walk in and take it from the rich Gringos. Consider the money spent
on instrumenting some community building as some that wasn't wasted
for a change.

 

[Uncle Al]

Bret Cahill wrote:

http://www.usc.edu/dept/civil_eng/Earthquake_eng/Selected_Publ/PDF/ICS_Paper_II.pdf

Two interesting questions:

Why aren't they instrumenting bldgs today with relatively cheap MEM
accelerometers?

Who decided to spend the equivalent of 200K on force balance
accelerometers and other electronics 40 years ago for a public bldg

1) Parkfield, CA
2) Caltech's Millikan Library.

Every time Southern California shakes a Caltech Earth Sciences grad
student writes his PhD.

--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz4.htm

 

[Mark Thorson]

Uncle Al wrote:

Bret Cahill wrote:

http://www.usc.edu/dept/civil_eng/Earthquake_eng/Selected_Publ/PDF/ICS_Paper_II.pdf

Two interesting questions:

Why aren't they instrumenting bldgs today with relatively cheap MEM
accelerometers?

Who decided to spend the equivalent of 200K on force balance
accelerometers and other electronics 40 years ago for a public bldg

1) Parkfield, CA
2) Caltech's Millikan Library.

Every time Southern California shakes a Caltech Earth Sciences grad
student writes his PhD.

In the 1970's, there was a lot of concern over the
so-called Palmdale Bulge. Trouble is, it now appears
the bulge never existed.

http://www.kilty.com/bulge.htm

 

[Bret Cahill]

http://www.usc.edu/dept/civil_eng/Earthquake_eng/Selected_Publ/PDF/IC....

Two interesting questions:

Why aren't they instrumenting bldgs today with relatively cheap MEM
accelerometers?

Who decided to spend the equivalent of 200K on force balance
accelerometers and other electronics 40 years ago for a public bldg

   1) Parkfield, CA
   2) Caltech's Millikan Library.

Every time Southern California shakes a Caltech Earth Sciences grad
student writes his PhD.

In the 1970's, there was a lot of concern over the
so-called Palmdale Bulge.  Trouble is, it now appears
the bulge never existed.

http://www.kilty.com/bulge.htm- Hide quoted text -

A good article underscoring the need for precision distance
measurements of fault lines.

Some article said frequency drops as a reinforced concrete structure
is degraded -- kind of like burning out resistors in circuit.


Bret Cahill

 

[Bret Cahill]

http://www.usc.edu/dept/civil_eng/Earthquake_eng/Selected_Publ/PDF/IC...

Two interesting questions:

Why aren't they instrumenting bldgs today with relatively cheap MEM
accelerometers?

Who decided to spend the equivalent of 200K on force balance
accelerometers and other electronics 40 years ago for a public bldg
out in the desert?

Someone in coastal California pretty much knew the building was coming
down.

"Hey, the hayseeds out in Imperial Valley just build this county
services bldg. that cannot survive a 6.0. WHAT AN OPPORTUNITY! We'll
instrument it and find out what happens to the frequency response of
RC structures during an earthquake . . ."


Bret Cahill