Figure 1 - uploaded by George L England
Content may be subject to copyright.
The 'original' version of KHONSAR™ with the two energy-dissipating elements, tubes, laid parallel with the axis of rotation (Horizontally-Laid-Tubes, HLT, version). The middle hinge is optional.
Source publication
A new beam-to-column (as well as bracing-to-frame) connection has been developed. This new joint, called KHONSAR,™ is a separate self-contained structural component with a specific geometry designed to allow rotations to develop far beyond those of joints developed and used so far. In its simplest form the new component comprises two parallel attac...
Context in source publication
Context 1
... the same previous specimens, HLT-V1, this time called HLT-V1-2, assuming that the distortions of the tube have been predominantly of 'elastic' nature. This test went on quite successfully. However, at later stages of the test, due to unavoidable imperfections existing in the specimens, the response of the assembly started to become unsymmetrical. Fig. 12 depicts the deformed shape of this assembly at a fairly early stage of the test, demonstrating the huge potential of this connection to deform under shear, something that none of the existing beam-to-column joints possesses. This happened while the shear strength of the specimens also proved to be far above what was initially expected ...
Similar publications
This paper is focused on the investigation of the effect of annealing on the microstructure and mechanical properties of welded carbon steel. The properties put into consideration were strength, hardness, ductility, and microstructure examination of the sample with optical microscopy. Samples of the same grades of steel plates of 10mm diameters wer...
The Paton Welding Journal, 2011, #4, 5-13
Structural-phase state of metal of the welded joints on high-strength low-carbon steel 17Kh2M (w6/5 = 20-23 °C/s) produced by using welding wires of different chemical compositions and structural types (Sv-08G2S, Sv-08Kh20N9G7T, Sv-10KhN2GSMFTYu) was investigated. Analytical estimation of differential contr...
Pipe reeling may lead to plastic pre-deformation (prestrain) around existing cracks in components; therefore, investigating whether this process accelerates or counteracts ductile crack growth, especially for strength mismatched welded joints, is warranted. This study focused on the effect of prestrain history on ductile crack growth in mismatched...
Seam-welded Zh-caloy-2 calandria tubes are used in the fuel channel of CANDU reactors, to isolate the hot pressure tube from the cool heavy-water moderator. The mechanical properties of irradiated welds are required to assess whether they will be satisfactory to the end-of-life of the reactor. It is impractical to irradiate short sections of caland...
Citations
... Despite the extensive description of the devised connection in previous papers (see Khonsari et al. (2001) & Khonsari et al. (2004), a brief introduction is given here. The developed connection, named KHONSAR™, is composed of two attachment plates which attach it to the face of the flange of the column and the end-plate of the beam, which is intended to be connected to the column. ...
A new general structural connection with the ability to connect various structural elements of any material to one another was invented. In contrary to all existing connections, it has a high shear deformation capacity which can be exploited in various circumstances including as a bracing-to-frame connection in concentrically-braced frames to reduce their high elastic stiffness. In this way, their natural frequencies decrease which in turn lead to a decline in their earthquake induced forces. This high shear deformation capacity which can be accompanied by high strength and stiffness is the source for its high energy dissipation capacity. The results of a number of monotonic as well as cyclic shear tests on various specimens of this connection with different dimensions are reported here. The monotonic tests results clearly show the high shear deformation capacity of this connection which was accompanied with high shear strength and stiffness. The hysteresis loops obtained through cyclic tests, which were 'stable' and 'well-rounded,' however, show the ability of this connection to dissipate energy in an efficient manner.
A new seismic resilient steel beam-to-column joint using replaceable buckling-restrained plates for energy dissipation was proposed in this paper. Such a joint consists of a column tree and an interior beam segment connected on site through bolted steel plates located inside beam flanges. The steel plates are considered as structural fuses to attract inelastic damage and dissipate energy. Their potential buckling is restrained by intentionally designed C-shaped shear tabs, which are also used to connect the beam webs to transfer the beam shear. Thus, both stable strength and superior energy dissipation capacity can be guaranteed. Six cyclic tests were conducted to study the seismic behavior and post-earthquake repair performance. The results evidenced that this joint was able to develop a normalized cumulative plastic rotation of 550 to 1100 until failure. Fuse plates could be quickly replaced after testing and the repaired joint developed nearly identical seismic performance as the original one. The proposed new joint provides an alternative solution, which is both economical and effective, for seismic resilient steel structures.
This paper presents details of numerical investigations on exterior beam-column joint sub-assemblages with a novel fuse link beam-to-column connection. The connection is designed to protect the connected beams and columns of moment frame buildings during strong earthquake shaking by confining the inelasticity within the connection elements. The connection consists of two fuse links and one standard shear tab. Detailed numerical analyses are performed to study the behaviour of the connection including the level of plastic strain distribution around the connection region. First, the results of numerical analyses are validated using experimental results of full-scale experimental investigations on exterior beam-column joint sub-assemblages, which demonstrated the good performance and replaceability of the connection. Then, parametric studies are carried out to identify and investigate the effect of major parameters on the connection behaviour - the key parameters being the geometric parameters of fuse link and the beam depth. Finally, it is shown that the results of the numerical study are in good agreement with those of an analytical model that can be used for proportioning of the fuse link connection at the design stage. Also, the results of the analytical model can be used in global analysis of moment frames using the developed fuse link connection.
