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Our firm will be involved in modernizing a hospital. The building is in steel and we have to reinforce the existing columns for seismic rehabilitation and increased gravity loads due to additional floors. Unfortunately, we have found very little literature on the subject of steel column reinforcement under load. Do you know of a good source of references? - P.M. 2/2/2009
The AISC document entitled Design Guide 15 - AISC Rehabilitation and Retrofit Guide: A Reference for Historic Shapes and Specifications (2002). See: http://www.aisc.org/store/c-12-design-guides.aspx Section 4.1.2 should be of interest. Generally, column reinforcement can be accomplished by welding on plates or other sections. This will generally greatly increase the radii of gyration as well as the cross-sectional area, both key to determining a compression member's factored resistance. Columns can also be encased in concrete. Numerous examples of column reinforcement are cited in the above-mentioned section but particularly in section 5. I highly recommend this publication for your library (I know, you are going to go broke if you buy all my recommendations — that is, if you read all the issues)! You can download the guide for 80USD as a non-member or for free as an AISC member. A professional membership is very advantageous for a consulting firm as you then have access to a multitude of technical resources free (in the electronic version) or at a reduced price (for the paper version).I often refer to this publication to help out engineers. In fact I just answered a question to J.F.B. who wanted to find the properties of a steel bridge built in 1910. The properties of ASTM A7 steel — a standard that appears in 1900 for bridge applications — can be found at Table 1.1a. The properties of historical steels, both ASTM and CSA, can also be found on Page 6-5 of the CISC Handbook of Steel Construction. Think about the history we have as an industry. It is difficult not to view it as a sign of durability and kept promises, but enough of that, it’s getting late; I will stop here. This question appeared in the "Ask Dr. Sylvie" column of Advantage Steel no. 33, Winter 2008.
The AISC document entitled Design Guide 15 - AISC Rehabilitation and Retrofit Guide: A Reference for Historic Shapes and Specifications (2002). See: http://www.aisc.org/store/c-12-design-guides.aspx Section 4.1.2 should be of interest. Generally, column reinforcement can be accomplished by welding on plates or other sections. This will generally greatly increase the radii of gyration as well as the cross-sectional area, both key to determining a compression member's factored resistance. Columns can also be encased in concrete. Numerous examples of column reinforcement are cited in the above-mentioned section but particularly in section 5. I highly recommend this publication for your library (I know, you are going to go broke if you buy all my recommendations — that is, if you read all the issues)! You can download the guide for 80USD as a non-member or for free as an AISC member. A professional membership is very advantageous for a consulting firm as you then have access to a multitude of technical resources free (in the electronic version) or at a reduced price (for the paper version).I often refer to this publication to help out engineers. In fact I just answered a question to J.F.B. who wanted to find the properties of a steel bridge built in 1910. The properties of ASTM A7 steel — a standard that appears in 1900 for bridge applications — can be found at Table 1.1a. The properties of historical steels, both ASTM and CSA, can also be found on Page 6-5 of the CISC Handbook of Steel Construction. Think about the history we have as an industry. It is difficult not to view it as a sign of durability and kept promises, but enough of that, it’s getting late; I will stop here.
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