Sources for Post-Tensioning Info and Products
Leading People and Companies in the Post-Tensioning Industry
Three companies dominate the PT strand market, although there are other smaller manufacturers. The leading companies have extensive information on their web sites:
- Suncoast Post-Tension is the largest manufacturer of PT strand-their web site has lots of good information.
- VSL was purchased a few years ago by Structural Group. There is an excellent tool on their web site for selecting the right PT system
- DSI is a German manufacturer; they also have a good basic description of PT (PDF).
Other leading figures in the PT industry include:
- Ted Neff, is the executive director of the Post-Tensioning Institute.
- Pawan Gupta, is the technical director of PTI.
- Ken Bondy is an engineer who has been designing PT structures for over 40 years; he wrote an excellent history of the industry (PDF) in Concrete Construction in December 2001.
- Larry Stadler, president of Suncoast Post-Tension is an energetic promoter of PT
- Bijan Aalami, is a professor at San Francisco State and a lifetime member of PTI.
- Precision Sure-Lock makes post-tensioning wedges, anchors, pumps and rams, tools, accessories and equipment.
Learning More about PT
PT design and construction is fairly specialized, but there are many sources of information. Here are a few of the best:
Post-Tensioning Institute: As with most segments of the concrete industry, post-tensioning has an association, the Post-Tensioning Institute (PTI), based in Arizona. PTI is primarily funded by the manufacturers of post-tensioning materials and PT installers, although it also has a number of members who are designers and contractors. PTI sponsors seminars, conducts a certification program, and publishes guidelines for PT design and construction, including:
- PTI Journal-published twice a year, covers the latest research and case studies on post-tensioned concrete
- "Construction and Maintenance Manual for Post-Tensioned Slab-on-Ground Foundations," published by PTI now in its third edition
- The "PTI Manual" is the bible of the industry
- PTI's analysis and design standards for shallow foundations on expansive soils can be downloaded at http://www.post-tensioning.org/technical.php.
- Post-Tension Magazine, published by Evaluation and Certification Services, is a new magazine that is published quarterly. Their third issue is now in process. www.ptconcrete.com, serves as the magazine's home page. There is lots of information on this site, including links to important publications.
- The Portland Cement Association has many case studies of buildings designed using PT, such as the Washington, D.C. headquarters of the National Association of Realtors and the first building within the District of Columbia to receive certification from the U.S. Green Buildings Council's LEED rating program. PCA's Washington headquarters is now also located in this building.
- Concrete Construction has published many articles on post-tensioning over the years. Bryan Allred, an engineer with Seneca Structural Engineering wrote a couple of very good articles recently-one on potential problems and one on PT for residential slabs.
- Adapt has an excellent stand-alone design package for post-tensioned slabs and beams.
The primary events for PT in the United States are:
- The annual PTI Technical Conference-the next one is scheduled for May 3 to 5, 2009 in Portland, Oregon.
- The American Concrete Institute conventions (spring and fall). ACI Committee 423, Prestressed Concrete, which is joint committee with ASCE, has primary responsibility for post tensioning.
To find other events:
- The PTI web site has an extensive listing of upcoming events.
- PT Concrete.com has a listing of industry events arranged in quarterly sections and also current post-tensioning related news on its home page.