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Title: A New Efficient Multiple Constraint Approach for Finite Element Analysis of Radius-cut RBS Moment Frames
Authors: Dawit, Hailu
Advisors: Dr.-Ing Adil Zekaria
Copyright: 2004
Date Added: 14-Oct-2008
Publisher: Addis Ababa University
Abstract: Abstract Following the 1994 Northridge, California Earthquake engineers realized that the traditional beam-column connection in moment frames was in fact brittle and thus unsafe. Extensive research was subsequently undertaken resulting in improved and safe connection details. Among the new and pre-qualified connection details is the Reduced Beam Section (RBS) moment connection. In RBS moment connections a portion of the beam flange is removed near the connection thereby reducing the stress and strain demands in the connection. Currently there is no accurate efficient and practical method for the analysis of moment frames with RBS connection. In this study, an accurate and efficient method for the linear elastic analysis of moment frames with RBS connection has been developed. The method is based on mixed dimensional finite element analysis. The connection region including some portion of the beam and column is modeled with shell elements, and the remaining part is modeled with computationally cheaper beam elements. Valid beam-shell transition is achieved using multi-point constraint equations derived by equating work on either side of the mixed dimensional interface. Normal and shear stress distributions at the interface have been assumed in accordance with simple beam theory. The derived constraint equations have been applied to specific examples using the general purpose finite element analysis program ANSYS. It has been found that the mixed models based on the derived constraint equations provide acceptably accurate and efficient analysis method for moment frames with RBS connection.
Description: A Thesis Submitted to the Graduate School of the Addis Ababa University in Partial Fulfillment of the Requirements for the Degree of Master of Science in Civil Engineering
URI: http://hdl.handle.net/123456789/1421
Appears in:Thesis - Civil Engineering

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