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PROCEEDINGS OF THE ELEVENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING
Edited by: B.H.V. Topping
An Improved Saddle-Like Connection with Rigid Behaviour
M. Foroughi1 and M.A. Barkhordari2
1Faculty of Engineering, University of Yazd, Iran
M. Foroughi, M.A. Barkhordari, "An Improved Saddle-Like Connection with Rigid Behaviour", in B.H.V. Topping, (Editor), "Proceedings of the Eleventh International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 206, 2007. doi:10.4203/ccp.86.206
Keywords: Khorjini, semi-rigid, scissors connection, peripheral plate, saddle like connection, rigid connection, rigid joint.
A type of saddle-like connection, generally called "Khorjini Connections", is a typical connection widely used in Iran, for more than a decade. Since these connections have been imperfect, considerable research has been conducted towards their enhancement. In recent years some improved details of "Rigid Khorjini Connections" have been established. Finally two types of "Rigid Khorjini Connections" have been specified in the "Draft of the Design and Construction Code for Building with Khorjini Connections", in Iran . Researchers have shown that typical Khorjini Connections do not have a desired behaviour under seismic loads, although the behaviour could be improved by modification measures. They have also recommended that, similar to the standard connection [1,2,3], the Khorjini Connections could be classified in three groups (Scissors Like, Semi-Rigid Scissors Like, and Rigid).
Finally two types of "Simple Khorjini Connections" and two types of "Rigid Khorjini Connections" have been specified in the "Draft of the Design and Construction Code for Building with Khorjini Connections", in Iran . However, there are some difficulties in formation of the rigid types. In this manner, authors have presented two different types of "Rigid Khorjini Connections". Type 1 named the "Rigid Khorjini Connection with Peripheral Angles" was previously presented by the authors .
In this paper, an improved Rigid Khorjini Connection has been proposed along with its analysis. The proposed connection, the "Rigid Khorjini Connection with Stiffened Peripheral Plates", consists of a lower peripheral plate, stiffened by triangular plates, and a similar upper peripheral stiffened plates. The models have been studied using the finite element method. At first, an experimental sample, incorporated in the Code  has been modelled considering identical conditions to the original experiment. The outcome has been compared with the experimental results. Subsequently, the proposed connection has been modelled.
Based on these studies it is the authors' belief that this type of connection has certain advantages such as simplicity in construction, as well as maintaining the desired stiffness and ductility. Therefore it is proposed that this connection should be considered as a "Rigid Connection" in the "Iranian National Code" as well as in the "International Codes".
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