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Item Information   Holdings       More by this author     Rinke, Brian J.     Subjects     Building, Iron and steel     Steel, Structural     Load factor design     Flexure     MSST Project.     Browse Catalog     by author:      Rinke, Brian J.       by title:      Reinforcing steel be...         MARC Display

Reinforcing steel beams with steel of different yield stress for flexure / Brian J. Rinke. by Rinke, Brian J. Subjects Building, Iron and steel   Steel, Structural   Load factor design   Flexure   MSST Project. Description:  115 leaves : ill. ; 29 cm. Contents:  Thesis advisor: Dr. John Zachar. Committee members: Dr. Hans-Peter Huttelmaier, Christopher Raebel. Introduction -- Literature review and design considerations -- Experiment -- Calculations and recommendations -- Appendix A: combined section property calculations ; B: beam capacity calculations ; C: strain gauge information ; D: ASTM specifications and mill certifications ; E: pictures. Reinforcing steel members by welding on additional steel pieces has been a practice for as long as welding has been available. Structural engineers regularly investigate a variety of older buildings with steel framing that require reinforcing of the members. Information about combining the assumed lower yield steel of the original member with the higher yield steel of the new pieces seems to be difficult to find. Will the higher yield strength of the new steel offer any additional load carrying capacity to the system? To explore this condition, four steel beams were obtained and additional steel pieces were welded to them. These shapes were configured in a manner that is common to the industry for reinforcing steel that is currently in place in a building's structure. Each steel beam was placed in the test frame one at a time, supported at each end with half-round supports, and a hydraulic ram in the center of the test frame provided the force. The applied force was spread to two equal point loads, each eight inches off the centerline. Although the steel of the original beam and the reinforcing pieces had different yield strengths, only the material that was furthest away from the neutral axis of the beam had any influence on the load capacity of the system. In all of these shapes this was the top flange of the original beam. For configurations like those used, it is recommended to use the yield stress of the original beam when designing reinforced shapes. It was also observed that the deflections of the beams were greater than the calculated values, possibly caused by a slow and steady shift of the neutral axis of the systems throughout the course of each experiment, even before the beams began to yield. In addition, all of the beams had about the same load limit before the rotational stability was exceeded, regardless of the thickness of the flange or the web of the beam or how it was reinforced.   Copy/Holding information Location Collection Call No. Status   Walter Schroeder Library Master's Theses AC805 .R564 2007 Available Add Copy to MyList Format: HTMLPlain textDelimited Subject:   Email to:

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