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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/2766

Authors: Temesgen, Wondimu
Advisors: Dr. Sjifferaw Taye
Keywords: SEMI - RIGID
Copyright: Sep-2007
Date Added: 7-May-2012
Publisher: AAU
Abstract: In most steel frame designs the beam to column connections are assumed to be rigid or pinned. Rigid joints, where no relative rotation occurs between the connected members, transfer not only substantial bending moments, but also shear and axial forces. On the other extreme, pinned joints are characterized by almost free rotation movement between the connected elements that prevent the transmission of bending moments. Despite these facts, the great majority of joints doesn’t exhibit such idealized behavior. A substantial effort has been made in recent years to characterize the behavior of semi rigid connections. Most design codes included methods and formulas to determine both their resistance and stiffness. EC3 and EC4, for instance, allow the use of springs attached to the end of the beams at both sides of the joints. In order to account for the panel shear deformation the code allows the use of interaction parameter, called the β factor. But since the definition of the β factor implies an approximation of internal forces at the joint, it requires an iterative process at the time of the global analysis of the structure. In order to avoid this iterative process various researchers proposed new elements accounting for various deformation modes of the connections. Although the new proposed element by Bayo et.al accurately characterizes the behavior of semi-rigid connections based on the EC component method it is not appropriate to use in commonly available software. In this thesis a new component-based two-node-connection element is proposed. By using the proposed two-node element the static and dynamic response behaviors of a semi-rigid frame as compared to a rigid frame of the same geometry and cross section are studied using a general purpose finite element package ANSYS. The study showed that connection flexibility tends to increase vibration periods and hence reduces the internal stresses due to a given earthquake action in the frame elements as compared to those in rigid frames.
URI: http://hdl.handle.net/123456789/2766
Appears in:Thesis - Civil Engineering

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