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RE: responsibility to retrofit existing structure during renovation

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I have one question
how we can do the Nonlinear time history analysis by the program SAP
2000 ?
I saw some examples but all of them include isolatores , but my building in project is simple building whitout isolators, i do not konw how i must define hinges for them?
and must define hinges or nonlinear links and how?
plz answer me as soon
thanks.
Seems you have listed all the hard questions. What about throwing some salad as they say.
 
My opinion is that professional engineering license carries with it responsibility to make some judgment calls and not all engineers will agree. As for the ?legal? aspect of our practice, while I don?t mean to minimize its importance, I don?t believe it can dictate what opinion you hold unless it is out right wrong or against the adopted code.
 
That said, I believe the idea is to not make things worse and therefore building codes will generally support improvements to structures. There are specific requirements in the IEBC which give background to the concept of ?improvement? and ?do no harm?, but bottom line is if it were easy, everyone would be an engineer.
 
Barry H. Welliver
BHW Engineers L.L.C.
barrywelliver2(--nospam--at)earthlink.net
 
From: Christopher Banbury [mailto:cbanbury(--nospam--at)arkengineering.net]
Sent: Friday, July 20, 2007 10:33 AM
To: seaint(--nospam--at)seaint.org
Subject: responsibility to retrofit existing structure during renovation
 
I am looking for some guidance and especially legal precedent for the responsibility and/or liability that an engineer may face when doing renovations and additions to existing structures.
In particular I am wondering how an engineer decides to what extent to require structural retrofitting of existing elements and systems that may be exposed during renovation under the following conditions:
  1. the proposed renovations have little or no structural effect on the existing structural system.
  2. the structural element/system in question has been exposed during renovation (eg. Removal of ceiling and wallboard).
  3. the existing structure meets the code it was built under and is may not be considered immanently dangerous.
  4. the existing structure clearly does not meet current code (eg. Trusses toe-nailed to top plate in high wind area).
  5. the code exempts the existing structure from compliance with the current structural code because renovations are under a certain threshold.
  6. minor structural modifications could greatly increase the safety of the building even if it doesn?t meet current code.
 
Thanks in advance.
 
Christopher Banbury, PE
President
 
Ark Engineering, Inc.
PO Box 10129, Brooksville, FL 34603
22 North Broad ST, Brooksville, FL 34601
Phone: (352) 754-2424
Fax: (352) 754-2412
 
 



leila  haj najafi


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