Structural Fire Performance of Innovative Moment-Resisting Connection Joining Steel Beams to HSS Columns

2014 ◽  
Vol 5 (4) ◽  
pp. 331-352
Author(s):  
Osama Salem ◽  
George Hadjisophocleous ◽  
Ehab Zalok
Keyword(s):  
Large Scale ◽  
Plate Thickness ◽  
Steel Beams ◽  
Fire Performance ◽  
Structural Fire ◽  
End Plate ◽  
Moment Connection ◽  
Moment Resisting ◽  
Regular Configuration ◽  
Extended End Plate

In this paper, experimental results of the structural fire behaviour of four large-scale steel frame test assemblies are presented. Test assemblies were made of HSS beams and columns connected together using an innovative extended end-plate moment connection configuration. Two different parameters were investigated, the connection end plate thickness and the degree of beam axial restraint. The fire performance of this beam-to-column configuration was compared to the behaviour of a commonly-used connection configuration with similar parameters and fire testing conditions. The newly-developed connection configuration behaved in a more flexible manner at elevated temperature than the regular configuration. In addition to improved constructability and pleasant appearance, the new connection configuration exhibits greater moment-carrying capacity and enhanced fire resistance characteristics.

Seismic Tests of Welded Moment Resisting Connections Made of Laser-Welded Stainless Steel Sections

2018 ◽  
Vol 763 ◽  
pp. 440-449
Author(s):  
Hafez Taheri ◽  
George Charles Clifton ◽  
Ping Sha Dong ◽  
Michail Karpenko ◽  
Gary M. Raftery ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Carbon Steel ◽  
Large Scale ◽  
Steel Structures ◽  
Steel Beams ◽  
Steel Connections ◽  
Steel Members ◽  
Moment Resisting ◽  
Steel Sections ◽  
Seismic Tests

Steel structures are well established as the preferred material for constructing seismic resisting systems in New Zealand and around the world. While the majority of steel framing is made of carbon steel, stainless steel is increasingly being considered for designing exposed steel structures. Because of significant differences in the mechanical properties between the two materials, seismic resisting system design rules for connections between carbon steel members may not be applicable, at least without modification, to connections between stainless steel members. This study has investigated the seismic performance of welded T-shaped beam-column moment resisting connections made of structural stainless steel beams and columns manufactured by laser welding. The paper included the results of three large-scale T-shaped specimens, of varying sizes, subjected to seismic loads. The grade of laser-fused stainless steel was 304 L and its specification was according to ASTM A276. The sections were subject to the seismic tests in accordance with the SAC protocol given in ANSI/AISC 341-10. The results shows substantial amount of energy dissipation by welded moment resisting stainless steel connections along with a high ductility capability and dependable behaviour in the inelastic range.

scholarly journals Numerical testing of steel beam-to-column bolted extended end-plate connection with haunches

2019 ◽  
Vol 29 ◽  
pp. 02008
Author(s):  
Dominiq Jakab ◽  
Aurel Stratan ◽  
Dan Dubina
Keyword(s):  
Material Model ◽  
Tensile Tests ◽  
End Plate ◽  
Numerical Testing ◽  
Experimental Campaign ◽  
Moment Resisting ◽  
Extended End Plate ◽  
Plate Connections ◽  
Plate Connection ◽  
Steel Joints

During the European research project entitled EQUALJOINTS (European pre-Qualified steel JOINTS) [1], which recently concluded, the matter of providing a set of pre-qualification procedures for moment resisting beam-to-column connections which are currently used in Europe has been addressed. During the experimental campaign 24 specimens with bolted extended end-plate connections with haunches were tested. The current paper presents the numerical model which has been developed such that numerical testing may be performed to further investigate specific details. In what concerns the material, an isotropic material model has been calibrated and used based on tensile tests of coupons extracted from the specimens to model the actual plastic behaviour. Moreover, the imperfections of the beam have been taken into account using a bucking analysis to model as accurate as possible the specimens tested. The interaction between parts has been modelled using contacts with different interaction laws. The model used for the bolt has been calibrated such that the preloading and failure replicate the behaviour of the actual bolts used in the experiments.

A comparative study on yield line mechanisms for four bolted extended end-plated connection

2021 ◽  
Vol 7 (2) ◽  
pp. 93
Author(s):  
Yasin Onuralp Özkılıç
Keyword(s):  
Experimental Data ◽  
Numerical Analysis ◽  
Plate Thickness ◽  
Economic Feasibility ◽  
Moment Connections ◽  
Yield Line ◽  
End Plate ◽  
Moment Resisting ◽  
Plate Connections ◽  
Line Patterns

Extended end-plated connections are preferred in moment resisting frames due to their advantages such as no required in-situ welding, accurate fabrication and economic feasibility compared to flange welded moment connections. The capacity of the extended end-plated connections depends on bolt configurations, end-plate thickness, bolt diameter and their material properties excluding column part. The thickness of end-plate can be computed using yield line mechanisms. Different yield line patterns are available in the literature and some of these are adopted in seismic codes to estimate the thickness of end-plate. In this study, the accuracy of different yield line patterns is compared using collected experimental data and numerical analysis. A parametric numerical analysis was conducted utilizing the finite element tool, ABAQUS. The results of experimental data and parametric study were evaluated for both unstiffened and stiffened four bolted extended end-plated connections. The results revealed that the capacity of the end-plate connections significantly depends on the yield line mechanism. Therefore, selecting an accurate yield line mechanism is essential in order not to overestimate the thickness of the end-plate. More importantly is that these yield line mechanisms can be directly implemented to AISC 358 and Turkish Building Earthquake Code 2018 (TBEC-2018).

01.05: Experimental and theoretical study of large capacity extended end-plate moment connection

ce/papers ◽  
2017 ◽  
Vol 1 (2-3) ◽  
pp. 205-214
Author(s):  
Rimon A. Samaan ◽  
Ahmed A. I. El-Serwi ◽  
Riham A. El-Hadary
Keyword(s):  
Theoretical Study ◽  
Large Capacity ◽  
End Plate ◽  
Moment Connection ◽  
Extended End Plate

Cyclic loading of end plate moment connections

2000 ◽  
Vol 27 (4) ◽  
pp. 683-701 ◽  
Author(s):  
B T Adey ◽  
G Y Grondin ◽  
J JR Cheng
Keyword(s):  
Cyclic Loading ◽  
Arc Welding ◽  
Plate Thickness ◽  
Welding Process ◽  
Design Parameters ◽  
Prediction Equations ◽  
Moment Connections ◽  
End Plate ◽  
Extended End Plate ◽  
Arc Welding Process

An experimental investigation of 15 cyclically loaded extended end plate connections was undertaken to assess the significance of some design parameters. The parameters investigated were beam size, bolt layout, end plate thickness, use of extension stiffeners, welding process, and weld preparation. Eleven of the 15 full-scale test specimens were designed to confine failure to the end plate and four were designed to develop the plastic moment capacity of the beam. Of the beam sizes tested (W360×51, W460×97, and W610×125) the W460×97 beam connections provided the most ductility. The relaxed bolt configuration provided more energy dissipation and connection ductility. The use of extension stiffeners improved the ability of the end plates to dissipate energy and increased the connection rotation at yield. An increase in end plate thickness results in an increase in the connection flexural strength. No significant difference in behaviour was observed between the connections fabricated using the shielded metal arc welding process and those fabricated using the flux-cored arc welding process. Bolt bending and loss of preload were observed in all the test specimens. End plate thickness prediction equations proposed by various researchers were evaluated by comparing predicted plate thickness with plate thickness used for the test specimens. New prediction equations that use yield lines in close agreement with those observed in the test specimens are proposed. The proposed prediction equations are able to predict the thickness of the end plate to within 13%. The proposed prediction equations are applicable to stiffened and unstiffened end plate moment connections with various bolt layouts. Extended end plate moment connections showed good potential for use in seismic zones.Key words: cyclic loading, energy absorption, extended end plates, moment connections, steel, yield line.

Research on the End-Plate Thickness of Extended End-Plate Connection in Plastic Hinge Theory

2011 ◽  
Vol 467-469 ◽  
pp. 1170-1174
Author(s):  
Xian Lei Cao ◽  
Tao Zhang ◽  
Cui Ling Ma
Keyword(s):  
Design Process ◽  
Plastic Hinge ◽  
Plate Thickness ◽  
Steel Frames ◽  
End Plate ◽  
Extended End Plate ◽  
Plate Connections ◽  
Plate Connection ◽  
Small Deformations ◽  
Plastic Theory

The extended end-plate connections widely used in steel frames, at home and abroad，many countries have given varieties of different methods to determine end-plate thickness. This paper, uses the plastic theory to analyze the end-plate thickness of the figure 7.2.9a in CECS 102：2002 specification, adopts small deformations of geometric relations and the equal principle of work both inside and outside, the prying force issue is considered according to whether deformation bolts do work, and finally discuss the design process of the end-plate thickness. Contrasting present norms, this method can significantly reduce end-plate thickness.

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