instrumentation and how to interpret the results. I was doing a project
with them and they located a fan that was out of balance on an adjacent
structure. They also monitored and helped assess the site for ground motion
vibration transmisability. The tolerance level was 4 micro radians.
I am not totally sure, but I believe they can instrument the building and
locate the source of the noise.
Their web site is http://www.geovision.com/
Regards,
Harold Sprague
>From: "Bill Allen" <t.w.allen@cox.net>
>Reply-To: <seaint@seaint.org>
>To: <seaint@seaint.org>
>Subject: Banging Bolts?
>Date: Tue, 3 Jul 2007 10:26:50 -0700
>
>A friend of mine works in a new building where there have been strange
>sounds which have been difficult to identify. The e-mail message below is
>what he received from management to explain the problem:
>
>
>
>It has been over two weeks since we have had a report of the loud noises
>that were occurring in the building. We believe we have identified the
>source and would like to share the following information with you.
>
>.
>
>The project design and construction team conducted a thorough inspection of
>the building, including the plumbing, mechanical and structural systems. A
>couple of independent consultants also assisted in this effort. All of the
>systems at Carson One were found to be safe and sound.
>
>
>
>The suspected cause of the noise is a phenomena known as "banging bolts".
>The team is confirming this information and will issue a report for the
>record. The cause of the noise is the high strength bolts at the
>structural
>steel connections making final adjustments as the building is loaded; it is
>a natural occurrence and does not reflect on the building's structural
>integrity. Most of these adjustments occur during construction, some occur
>early in occupancy (as many of you have heard) and eventually they stop
>completely. These adjustments have been reported as long as two years
>after
>construction of a building.
>
>
>
>We will update you as new information is received and appreciate your
>patience as we deal with these issues.
>
>
>
>Does this sound reasonable? I've never heard of "banging bolts", but I
>don't
>do a lot of steel work, so maybe it is common.
>
>
>
>Thanks,
>
>
>
>T. William (Bill) Allen, S.E.
>
>ALLEN DESIGNS <http://www.AllenDesigns.com>
>
>Consulting Structural Engineers
> V (949) 248-8588 . F(949) 209-2509
>
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