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Re: CMU RETROFIT

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1.  Retrofit Codes: Chapter A2 of the International Existing Building Code published 2003 by ICC; Chapter 2 of the Guidelines for the Seismic Retrofit of Existing Buildings, published 2001 by ICBO.
2.  Rules vary.  Requirement to comply will depend on the jurisdiction, how extensive other work is, and the date of construction.  Consult the Building Official.
3.  Inject a shrinkage-controlled sand-cement-lime into voids between bond beams, filling them bottom to top.  Work with Ace Repointing Service of Los Angeles.  Internal blockages to complete grouting may be hard to find.  Consider not filling ungrouted cells.
4.  The above cited retrofit codes regulate anchorage -- not diaphragm analysis.
5.  The local jurisdiction may have other requirements.
6.  Structural Renovation of Buildings by Alexander Newman, published 2001 by McGraw-Hill may be useful.
7.  Spend enough time at the building to understand its structural system in relation to the requirements of the applicable Code.  You may not need to know the details of the reinforcing system.
 
Good luck 
 
Nels Roselund
Structural Engineer
South San Gabriel, CA
njineer(--nospam--at)att.net
----- Original Message -----
Sent: Thursday, July 15, 2004 1:56 PM
Subject: CMU RETROFIT

I have a project that is about 30 years, CMU, two story office building here in California.   The upper story walls are partially grouted while the lower walls are fully grouted. The bulding has been abandoned for couple of years and now the Client want to use the building again (same office building). The Client wants the building to be checked for current seismic code. I have questions that I hope someone on the list can answer.
 
1.    Is there a code or guideline for retrofitting CMU building similar to concrete tilt-up   buildings?
 
2.    If there is, is the owner required to comply such retrofitting code?
 
3.    If I want to fully grout the existing partially grouted masonry,  what is the easiest way to do it?
 
4.    Is checking the diaphragm required?  There is no alteration or addition of the existing structure and there is no change in use.
 
5.    What other areas I need to consider in retrofitting the building?
 
6.    Are there available books and references in retrofitting masonry buildings?
 
7.    The bad thing of all this is there's no plans or drawings of the existing building. Is it recommended to do some destructive testing to find out the size of reinforcement?
 
I have done concrete tilt-up and solid masonry retrofit but not yet on partially grouted building. 
 
Thanks for your help in advance.
 
A. S. Quilala Jr., P.E.