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RE: structures & ethics[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: structures & ethics
- From: "Honles, Thomas" <Thomas.Honles(--nospam--at)ladwp.com>
- Date: Mon, 22 Nov 2004 11:58:09 -0800
You've got a good real-world problem/situation here.
Steve, I believe that in having been hired to investigate the structure for your client, you would be reporting that the structure is not code compliant, and then pointing out those areas in which you have determined it does not meet code. Even if it met the code in the year under which it was built (a situation I run into more often), it may not be compliant with current code. Codes evolve for good reason (e.g. drywall gypsum board shear walls). I would point those differences out in the report, as it is needed for the client to make the decision. Ultimately it becomes an issue between the owner of the building, who has liability for the tenants, and the enforcement agency, who has jurisdiction over the building standards in the community. Once the owner/client is aware of the hazards, we can move to discussing hazard mitigation.
Regarding the perceived oddity of the material overstresses in your calculations versus the actual 30 year performance of the building, I generally agree with the remarks that have been stated so far in this discussion thread. Namely, adjacent materials and conditions may be providing stress redistributions, and design load assumptions may be greater than actually applied. One in particular that I did not see fully mentioned is the variance in material ultimate strength. One response mentioned sample testing. By virtue of it being a natural material, the deviation of actual ultimate strength as obtained by testing from the expected strength (even is select structural grades) will be significant. Also, design strength specifications are based on expected average moisture content and if the structure has provided an environment in which the wood moisture content is less than that, you will see greater ultimate strengths. The drier conditions could result either from climate location, or from conditioned space (heating).
These are just quick opinions based on what I browsed so far on this discussion thread. Good luck.
Thomas Honles, SE, PE
Los Angeles, CA
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