Voided Concrete Floor System
Tony Johnson
Concrete Reinforcing Steel Institute
An overview of the voided concrete floor system including a review of historical systems showing an evolution of the technology resulting in modern systems utilizing hollow plastic spheres cast into a flat concrete plate floor system. Design methodology will be discussed including an introduction to CRSI’s design guide. Case studies will be presented to show the range of projects which have utilized voided flat plate floor systems across the United States.
The presentation will also review the most recent updates to the steel reinforcement specifications as well a review of high strength reinforcing steel development and implementation, and an brief introduction to CRSI Concept program, a web based preliminary design tool for reinforced concrete floor systems, including voided flat plate floor system.
Anthony (Tony) Johnson PE, has been a member of the Concrete Reinforcing Steel Institute’s Regional Manager team since October 2007. He is responsible for providing technical assistance, outreach and education to engineers, architects, owners, contractors, as well as student groups, across the CRSI Midwest Region. As CRSI’s Senior Region Manager, he is also actively involved in the development and implementation of CRSI’s promotional strategy across the entire United States and three Canadian provinces. His work also includes the development and management of the CRSI Mill Database, an industry wide statistical and market analysis of all reinforcing products produced for and used in the U.S. construction market. Tony also leads CRSI’s efforts for forecasting the reinforcing steel market on a national, regional and state level as well as reporting on the market share of reinforced concrete across various vertical construction markets.
Prior to joining CRSI, Tony was employed by the Edw. C. Levy Co. where he served in several technical services and product management positions for more than 10 years. During this time, he led a staff of technical specialists and quality control technicians and was responsible for the continuous improvement of product quality and for product physical properties analysis and reporting. In the late 1990’s, he was employed as a Site Engineer with Walker Civil Engineering in Sydney Australia.
Tony is actively involved with many concrete and construction industry associations, both throughout the Midwest and on a national level. He is a member of the American Concrete Institute (ACI), and is Past President and current Treasurer of the ACI Greater Michigan Chapter, he was awarded the prestigious ACI Chapter Activities Award in April 2013. He also serves on ASTM International’s committee A01.05 on Steel Reinforcement and is an Ex-Officio Member of the Tilt-Up Concrete Association’s Board of Directors.
In 2004 Tony graduated from the Michigan State University Eli Broad Graduate School of Management where he attained a Master of Business Administration. In 1997, he graduated with honors from the University of Wollongong (Australia) with a Bachelor of Engineering in Civil Engineering.
Tony is a registered Professional Engineer in the State of Michigan.
