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    A novel concept for a deformable joint in offshore structures

    , Article Proceedings of the 21st International Conference on Offshore Mechanics and Arctic Engineering (OMAE), Oslo, 23 June 2002 through 28 June 2002 ; Volume 1 , 2002 , Pages 503-511 Khonsari, S. V ; England, G. L ; Mahboub-Farimani, M. R ; ASME ; Sharif University of Technology
    A new semi-rigid beam-to-column, as well as bracing-to-frame, connection has been developed. In addition to its application in building structures, due to its special features and characteristics, it can best lend itself to offshore jackets, where fracture caused by fatigue has always been a major concern. The adverse effects of welding, material embrittlement, residual stresses, etc., pronounced by cyclic loading on such structures, can be overcome by using this new connection. Moreover, it can be easily used in the structure of various modules used in the topside of platforms and FPSOs. The particular feature of this connection is its geometry, which is so devised that it allows much... 

    Innovative structural joint tolerates high rotational and shear overload

    , Article 23rd International Conference on Offshore Mechanics and Arctic Engineering, Vancouver, BC, 20 June 2004 through 25 June 2004 ; Volume 1 B , 2004 , Pages 875-883 Khonsari, S. V ; Parvinnia, S. M. H ; England, G. L ; Hajialiakbari Fini, E ; Sharif University of Technology
    A new beam-to-column and bracing-to-frame connection that can tolerate high rotational and shear overload is described. The connection is a self-contained separate entity that comprises two parallel attachment plates between which two circular tubes are laid and fixed through welding. The whole combination can also be produced by extrusion, where the plates are laid in an orthogonal relation with the axis of bending. In the welded version, the two plates are laid in a parallel relation with the axis of bending  

    Further investigation into a novel concept for a deformable joint in offshore structures

    , Article 22nd International Conference on Offshore Mechanics and Arctic Engineering; Offshore Technology Ocean Space Utilization, Cancun, 8 June 2003 through 13 June 2003 ; Volume 1 , 2003 , Pages 479-487 Khonsari, S. V ; England, G. L ; Parvinnia, S. M. H ; Sharif University of Technology
    A new general semi-rigid beam-to-column connection for skeletal structures, also applicable to offshore platforms, was devised. In a previous paper (OMAE02-28264), the general features of this joint together with some proposed details for its use in fabricating new platforms, as well as retrofitting and repair of existing platforms, were introduced. Moreover, the results of some quasi-static tests on the 'original' version of the connection, in which the energy-dissipating elements (tubes) of the connection are laid in a parallel relation to the axis of bending, were reported. Here, in this paper, the results of recent experimental work on the 'alternate' version of the connection, in which... 

    Seismic performance of reduced web section moment connections

    , Article International Journal of Steel Structures ; Volume 17, Issue 2 , 2017 , Pages 413-425 ; 15982351 (ISSN) Momenzadeh, S ; Kazemi, M. T ; Hoseinzade Asl, M ; Sharif University of Technology
    Korean Society of Steel Construction  2017
    Seismic behavior of beam-to-column connections can be improved by shifting the location of inelasticity away from the column’s face. Such connections can be achieved by reducing the flange area at a specific distance from the beam-column connection, called reduced beam section (RBS), or by reducing web area by introducing a perforation into the web, called reduced web section (RWS). This paper presents a parametric study that is carried out on the effect of the perforation size, perforation location, and the beam span length in the RWS connections, using finite element modeling. Next, an interaction formula is derived for design purposes, and a step by step design method is developed.... 

    Parametric Investigation of Behavior of Moment Connections to CFST Columns

    , M.Sc. Thesis Sharif University of Technology Ebrahimi, Mostafa (Author) ; Khalu, Alireza (Supervisor)
    In recent years use of concrete filled steel tube column structures has been increased due to their several advantages. In these columns the steel tube provides confinement for the concrete core of the column, so it increases axial strength and flexibility of the concrete core, and prevents spalling of the concrete. On the other hand the concrete core delays the local buckling steel tube and increases its bearing capacity. In addition, these columns have higher stiffness and strength than typical concrete columns due to placement of steel in farthest point of column cross section. The steel tube besides its structural role acts as framework for the concrete core and reduces time and cost of... 

    Analyzing and Modeling of Semi-hinged Connections in Steel Structure

    , M.Sc. Thesis Sharif University of Technology Haji kazemi, Mohsen (Author) ; Mofid, Massoud (Supervisor)
    Double angle connections, which are welded to the beam web and bolted to the column flange, are usually used to make hinged or semi-hinged connections. Several models are presented in this study whose geometrical properties are different. The finite element software package is used to develop the finite element analysis of the connections. An analytical method is presented that can be used to determine the behavior and deformation for this type of connection. The correctness of Moment-rotation curves of finite element analysis for each connection has been ascertained by comparison, using analytical technique; and a very good agreement has been obtained  

    Cyclic Behavior of Interior Reinforced Concrete Beam-column Connection with Self-consolidating

    , Ph.D. Dissertation Sharif University of Technology Salehi Mobin, Jalal (Author) ; Kazemi, Mohammad Taghi (Supervisor)
    A significant amount of research in self-consolidating concrete technology is being placed in evaluating the suitability of the material for use in structural applications. However, research is needed to confirm the ability of self-consolidating concrete structural elements to adequately resist vertical and lateral loads. In a reinforced concrete building subjected to earthquake type loading, the beam to column connections constitute one of the critical regions and they must be designed and detailed to dissipate large amounts of energy without a significant loss of stiffness or strength. In the experimental part of this study, four full size interior beam-column subassemblages with 3.0 m... 

    Cyclic behaviour of interior reinforced concrete beam-column connection with self-consolidating concrete

    , Article Structural Concrete ; Volume 17, Issue 4 , 2016 , Pages 618-629 ; 14644177 (ISSN) Salehi Mobin, J ; Kazemi, M. T ; Attari, N. K. A ; Sharif University of Technology
    A significant amount of research on self-consolidating concrete (SCC) technology has been devoted to evaluating the suitability of the material for its use in structural applications. However, more research is required to confirm the adequacy of SCC structural members for resisting gravity and seismic loads. This study focuses on the experimental investigation of the seismic performance of interior reinforced concrete beam-column connections with SCC. Four beam-column connection specimens, three with SCC and one with normally vibrated concrete (NC), were designed for this experimental study. Factors such as concrete type (SCC or NC) and axial load ratio (0, 7.5 and 15 % of column section... 

    Performance of Steel Beam Connections with Elliptical Opening in Beam Web

    , M.Sc. Thesis Sharif University of Technology Taghinia Hejabi, Arash (Author) ; Kazemi, Mohammad Taghi (Supervisor)
    After the 1994 Northridge earthquake when investigations show clear results for brittle failure near Beam-Column rigid Connections, research on these connections begun and various theories were suggested for better performance under cyclic loads. One of the appropriate ways is shifting yield beam location from beam-column connection to the beams only. Reducing the capacity of the beam through the beam flange or web far enough from the column, creating special ductile region in the beam. In this thesis, weakening is made by creating an elliptical opening in web beams. If the correct design criteria for this type of connection are suggested, it can satisfy the "weak beam - strong column" and... 

    Compactness requirements of RBS connections

    , Article Advances and Trends in Structural Engineering, Mechanics and Computation - Proceedings of the 4th International Conference on Structural Engineering, Mechanics and Computation, SEMC 2010, 6 September 2010 through 8 September 2010 ; 2010 , Pages 663-666 ; 9780415584722 (ISBN) Vasseghi, A ; Shahidi, S. G ; Zingoni A ; Sharif University of Technology
    Flexible steel frame system is the most common structural system for mid-rise buildings. Northridge earthquake is turning point in designing flexible steel frames and their connections. During this earthquake a large number of beam-column connections in such structures were ruptured in a brittle manner. After this earthquake many researches were conducted on a variety of beam-column connections with an aim of improving their behavior during earthquake. One such connection which have been studied extensively both experimentally and analytically is a connection with Reduced Beam Section (RBS). The most important advantage of this connection is its high ductility and its ability to dissipate... 

    Numerical study of an innovative SMA based beam-column connection in reducing the seismic response of steel MRF structures

    , Article Scientia Iranica ; Volume 23, Issue 5 , 2016 , Pages 2033-2043 ; 10263098 (ISSN) Rofooei, F. R ; Yadegari Farzaneh, A ; Sharif University of Technology
    Sharif University of Technology  2016
    During recent years, Shape Memory Alloys (SMAs) have been effectively used to control the seismic response of structural systems. Recovering the residual strains upon unloading (super-elasticity) or by heating (shape memory effect) is the main characteristic of SMA materials. This paper explores the efficiency of a proposed application of steel & SMA bolts in improving the seismic behavior of connections in steel Moment Resisting Frame (MRF) structures. A new semi-rigid, end-plate, beam-column connection is introduced, which is based on parallel application of steel and austenite-phase SMA bolts. A number of 3-D steel MRF structural models with different numbers of stories and mass... 

    Behaviour of an innovative universal structural connection under monotonic and cyclic shear loading

    , Article Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE, 31 May 2009 through 5 June 2009, Honolulu, HI ; Volume 2 , 2009 , Pages 765-775 ; 9780791843420 (ISBN) Khonsari, S ; England, G. L ; Mohammadi, A. R ; Sharif University of Technology
    A new structural connection with special unique features was developed. While under bending it showed very high rotational capacity, in shear, unlike other existing connections, it also demonstrated a large shear deformation capacity. The ductile response of this connection stems from its innovative geometry as well as the ductility of the elements embedded in it. Since the previous shear tests on the specimens of this connection were carried out under 'unrestricted' conditions, the tests reported here were all under 'restricted' conditions. These shear tests consisted of 'monotonie' as well as 'cyclic' tests on mild steel specimens. Due to the restrictions imposed on the specimens during... 

    Response of a novel beam-to-column connection to monotonic and cyclic flexural loading

    , Article Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE, 9 June 2008 through 13 June 2008, Berlin ; Volume 2 , 2008 , Pages 599-608 ; 9780791848197 (ISBN) Khonsari, S. V ; England, G. L ; Shahsavar Gargari, M ; Parvinnia, M. H ; Sharif University of Technology
    A new beam-to-column joint with high rotational as well as shear deformation capacity was devised. This high rotational 'capacity' is required to fulfill the great 'demand' for rotation arising during earthquakes, severe waves and current loads, etc. Due to its ability to contain damage during an overload, it leaves the connected elements intact. This, together with its replaceability can reduce the cost of post-event repair substantially. Its bending as well as shear performance under "monotonie" loading had already been assessed experimentally (OMAE'02-28864, OMAE'03-37292, OMAE'04-51494 & OMAE'05-6736l) and proved well superior to that of conventional joints. In order to study its... 

    Investigation on the seismic behavior of steel MRF with shape memory alloy equipped connections

    , Article Procedia Engineering ; Volume 14 , 2011 , Pages 3325-3330 ; 18777058 (ISSN) Rofooei, F. R ; Farhidzadeh, A ; Sharif University of Technology
    Shape Memory Alloys (SMA) are among the new passive control devices that have gained a large attention due to its inherent features, i.e., recovering the induced residual strains upon unloading (superelastic effect) or by heating (shape memory effect). In this work, the seismic behavior of a set of steel structural models with different number of stories and eccentricities equipped with a type of fixed SMA connections is investigated. Considering an existing SMA connection model in austenite phase, the related moment-rotation behavior is verified through numerical simulation. Then, extensive nonlinear dynamic analyses are performed using a number of 3, 6, 9, and 12 story structural models... 

    Response of a novel beam-to-column/brace-to-frame connection to monotonic and cyclic shear loading

    , Article Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE, 9 June 2008 through 13 June 2008, Berlin ; Volume 2 , 2008 , Pages 609-618 ; 9780791848197 (ISBN) Khonsari, V ; England, G. L ; Abazarsa, F ; Ocean, Offshore, and Arctic Engineering Division; ASME ; Sharif University of Technology
    A new universal structural joint was developed. While in bending it has a high rotational capacity, which can be accompanied by large bending stiffness and strength, in shear, it also has a very high shear deformation capacity, which can again be accompanied with large shear stiffness and strength. While the former characteristic makes it a good candidate for being used as a beam-to-column joint, the latter makes it highly applicable in connecting braces of a braced frame to the frame members. The experimental study carried out previously on this joint, concentrated on the performance of its steel specimens under 'monotonie' shear loading as well as that of its aluminium specimens under both...