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Study on Plastic Deformation of Interior Support at the Continuous I-Beam Bridge  

Chung, Kyung-Hee (Department of Railroad and Civil Engineering, Korean National Railroad College)
Kim, Jin-Sung (Department of Architecture and Environmental Engineering, Induk Institute of Technology)
Yang, Seung-Ie (Department of Civil and Environmental Engineering, University of Colorado at Boulder)
Publication Information
Journal of the Korean Society of Safety / v.17, no.4, 2002 , pp. 146-152 More about this Journal
Abstract
The steel shows plastic deformation after the yield point exceeds. Because of overloads, the plastic deformation occurs at the interior support of a continuous bridge. The plastic deformation is concentrated at the interior support, and the permanence deformation at the interior support remains after loads pass. Because local yielding causes the positive moment at the interior support, it is called "auto moment". Auto moment redistributes the elastic moment. Because of redistribution, auto moment decreases the negative moment at the interior support of a continuous bridge. In this paper, the moment-rotation curve from Schalling is used. The Plastic rotation is computed by using Beam-line method, and auto moment is calculated based on the experiment curve. The design example is presented using limit state criterion.
Keywords
auto-moment; moment-rotation curve; plastic rotation; local yield; overload; permanence deformation; limit- redistribution; plastic defo;
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